Abstract

A first controller (40) comprises a first processor and a first memory. A second controller (50) comprises a second processor and a second memory. When transmitting data from the first controller (40) to the second controller (50), the first controller (40) repeatedly executes an operation of writing the transmission data to the first memory according to a clock signal, and reads out the transmission data from the first memory for output to a communication line. The second controller (50) writes received data, which is received from the communication line, into the second memory according to the clock signal, and reads out the received data from the second memory according to the clock signal. The second controller (50) transfers a data value in a current clock cycle to the second processor if a plurality of data values in a plurality of consecutive clock cycles, including the current clock cycle, match in the read received data.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H04L 1/08 - Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Abstract

In the present invention, a base member (20) includes a bottom plate (21) and a side plate (23). In the bottom plate (21), a plurality of first capacitors (10) are arranged in a second direction that is an alignment direction. The side plate (23) is joined to an end of the bottom plate (21) in a third direction and disposed vertically from the bottom plate (21) in a first direction. A pair of fins of each of a plurality of fixing members (70) are attached to the side plate (23) so that the plurality of capacitors (10) are fixed to the base member (20). In the side plate (23), respective fixing members (70) of odd-numbered rows in the alignment direction are provided at the same position in the first direction. Respective fixing members (70) of even-numbered rows in the alignment direction are provided at the same position in the first direction, wherein, in the first direction, the positions of the fixing members (70) of the even-numbered rows are different from the positions of the fixing members (70) of the odd-numbered rows. Fins of two fixing members (70) adjacent to each other in the second direction are arranged side by side in the first direction.

IPC Classes  ?

• H01G 2/02 - Mountings
• H01G 4/38 - Multiple capacitors, i.e. structural combinations of fixed capacitors

Abstract

An object of the present disclosure is to obtain an active gas generation apparatus capable of supplying a highly concentrated active gas from a gas ejection port to a processing space at a subsequent stage. Then, in the active gas generation apparatus (51) of the present disclosure, in a main dielectric space being a space in which an electrode dielectric film (30) and an electrode dielectric film (40) face each other, a region where electrode conductive films (31) and (41) overlap each other in a plan view is defined as a main discharge space (50). In an auxiliary dielectric space being a space where the electrode dielectric film 30 and a shield dielectric film 8 face each other, a region including a dielectric through hole (14) and a cover through hole (15) is defined as an auxiliary discharge space (58). The auxiliary discharge space (58) includes a part of a buffer space (9) above the shield dielectric film (8), and a path leading from the auxiliary discharge space (58) to the gas ejection port (61.62) is defined as an active gas flow path.

IPC Classes  ?

• H01J 37/32 - Gas-filled discharge tubes

Abstract

A plurality of connection members extend in a first direction perpendicular to a vertical direction. A plurality of terminal members are attached to the plurality of connection members, respectively. Each of the plurality of terminal members includes a fixed portion and a connected portion. The fixed portion is attached to a connection member and extends in the first direction. The connected portion is joined to one end portion of the fixed portion in a longitudinal direction, and an electric wire is connected to the connected portion. The connected portion extends in a direction orthogonal to the direction in which the fixed portion extends. Each of the plurality of terminal members is attached to the connection member in any of a first attitude in which the connected portion extends upward in the vertical direction and a second attitude in which the connected portion extends downward in the vertical direction.

IPC Classes  ?

• H02B 1/20 - Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards

Abstract

A web browser (5) makes a communication thread (7) and a DOM update thread (6) run in parallel. The communication thread (7) overwrites, when signal data having the same unique identifier as received signal data already exists in a buffer area, the signal data stored in the buffer area with the received signal data. When receiving a signal data request event from the DOM update thread (6), the communication thread (7) transmits all signal data stored in the buffer area to the DOM update thread (6). The DOM update thread (6) updates a DOM for all the signal data. The DOM update thread (6) transmits, after updating the DOM, the signal data request event to the communication thread and updates, according to the updated DOM, a display content of a display part displayed on the web browser (5).

IPC Classes  ?

• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

A detection device according to an embodiment detects a presence or absence of a processing material adhered to an interior wall of a drum of a mill pulverizing a mineral. The detection device is configured to store an initial torque detected at a preset initial rotation angle, calculate a maximum torque based on the initial torque, the initial rotation angle, and a rotation angle greater than the initial rotation angle, calculate a ratio of a torque at the rotation angle divided by the maximum torque, compare the ratio and a preset threshold, and determine that the processing material is adhered to the interior wall of the drum when the ratio is equal to the threshold or greater than the threshold.

IPC Classes  ?

• B02C 17/18 - Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls - Details
• B02C 25/00 - Control arrangements specially adapted for crushing or disintegrating
• G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
• G01N 33/24 - Earth materials

Abstract

Provided is a DC power supply device that is connected to a load that can become a DC power supply, the DC power supply device comprising: a main circuit unit that has a high potential output terminal connected to a high potential input terminal of the load, and a low potential output terminal connected to a low potential input terminal of the load, and that is connected to a power supply, converts the power supplied from the power supply to DC power according to the load, and that supplies the converted DC power to the load; and a first rectifying element that is provided at one of between the high potential input terminal and the high potential output terminal, and between the low potential input terminal and the low potential output terminal, and suppresses the inflow of energy from the load to the main circuit unit. As a result, provided is a DC power supply device that can suppress the inflow of energy from the load.

IPC Classes  ?

• H02M 7/12 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02M 3/155 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

An electric power conversion unit comprising a casing, a first element, a second element, and an anti-explosion plate. The first element is disposed inside the casing. The second element is disposed adjacent to the first element in a horizontal direction inside the casing. The anti-explosion plate covers the first element and the second element in a top view of the casing. The anti-explosion plate is a laminate conductor connected to the first element and the second element.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

Provided is an HMI screen creation device capable of creating an HMI screen in which a plurality of operation elements can be exclusively placed with a high degree of freedom without degrading the quality of the HMI screen. An HMI screen design device according to the present disclosure comprises a drawing unit having a stencil area in which the plurality of operation elements to be placed on the HMI screen are arranged so as to be selectable and a drawing area in which a drawing is prepared by placing the operation elements selected on the stencil area, and a drawing data generating unit that generates drawing data, which is data about the drawing, in which the plurality of operation elements are placed. The drawing unit includes an exclusive grouping means that mutually exclusively groups the plurality of operation elements placed on the drawing.

IPC Classes  ?

• G06F 3/04817 - Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance using icons
• G05B 23/02 - Electric testing or monitoring
• G06F 3/14 - Digital output to display device
• G06F 8/34 - Graphical or visual programming

Abstract

An insulation diagnostic device according to an embodiment performs an insulation diagnosis of a three-phase AC motor on the basis of a U-phase current, a V-phase current, and a W-phase current supplied to the three-phase AC motor, and includes: a current vector calculation module that calculates at least one of a zero sequence current vector or a negative sequence current vector on the basis of the U-phase current, the V-phase current, and the W-phase current; a reference current vector storage unit that stores a reference current vector in advance; a current difference vector calculation module that calculates a current difference vector that is a difference between a current vector calculated by the current vector calculation module and the reference current vector; and a determination module that determines an insulation state of the three-phase AC motor on the basis of the current difference vector.

IPC Classes  ?

• G01R 31/14 - Circuits therefor
• G01R 31/34 - Testing dynamo-electric machines
• H02P 21/14 - Estimation or adaptation of machine parameters, e.g. flux, current or voltage

Abstract

A respiratory ventilators system having an inlet configured to be connected to a pressurized air or gas source; an outlet configured to be connected to a patient interface; a valve in-line between the inlet and the outlet; and a control unit configured to control the valve for controlling flow of pressurized air or gas from the source to the patient, wherein the valve includes an air or gas reservoir or accumulator incorporated into the valve body.

IPC Classes  ?

• A61M 16/20 - Valves specially adapted to medical respiratory devices
• A61M 16/00 - Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
• A61M 16/04 - Tracheal tubes
• A61M 16/06 - Respiratory or anaesthetic masks
• A61M 16/10 - Preparation of respiratory gases or vapours

Abstract

Provided is a power conversion system comprising a power conversion device and equipment. The power conversion device includes: an inverter that converts power into AC power and outputs the AC power; and a filter circuit in which a circuit component provided on the AC output side of the inverter and having a damping resistor and/or a filter reactor, and an AC capacitor that is disconnected from the circuit in the event of a fault, are connected in series. The equipment includes: a voltage recognition unit that recognizes the voltage value of a voltage generated by the circuit component; a voltage calculation unit that calculates a prescribed voltage calculation value on the basis of the voltage value of the voltages generated by the circuit component and recognized by the voltage recognition unit; a fault determination unit that compares the magnitude of the voltage calculation value calculated by the voltage calculation unit with a predetermined threshold value, and determines that there is a fault in the AC capacitor when the voltage calculation value is smaller than the predetermined threshold value; and an operation control unit that stops the power conversion device when the fault determination unit has determined that there is a fault in the AC capacitor while the power conversion device is running.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

Provided is a charge/discharge management system comprising a plurality of output units which are used for connection to EVs and a charger which charges the EVs connected to the plurality of output units, the charger comprises a power supply unit which converts power supplied from a power supply to DC power matching the EVs, a switching unit which switches paths between the power supply unit and the plurality of output units to thereby supply the DC power output from the power supply unit to any one of the plurality of output units, and a control unit which controls the operation of the power conversion performed by the power supply unit and controls the operation of the path switching performed by the switching unit and the control unit starts the charge of the EV having a charge amount of an electricity storage device lower than or equal to a charge start value. As a result, there is provided the charge/discharge management system which can suppress over-discharge of the plurality of EVs more simply while suppressing an increase in facility cost.

IPC Classes  ?

• H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters

Abstract

This hot rolling line comprises: a rough rolling mill; a finishing rolling mill; an intermediate device group provided between the rough rolling mill and the finishing rolling mill; a rough outlet side thermometer provided between the rough rolling mill and the intermediate device group; a finishing inlet-side thermometer provided between the finishing rolling mill and the intermediate device group; and a control device. The intermediate device group includes a cooling device which uses cooling water to cool a material-to-be-rolled. The control device includes: a setting calculation device which determines a flow rate setting value of the cooling water in the cooling device; a feed forward control device which executes, on the basis of the flow rate setting value, a feed forward control of the flow rate of the cooling water in the cooling device; and a learning device which calculates learning values on the basis of actual flow rate values of the cooling water in the cooling device and finishing inlet-side temperature values indicating actual temperature values of the material-to-be-rolled measured by the finishing inlet-side thermometer.

IPC Classes  ?

• B21B 45/02 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning

Abstract

According to an embodiment, a power conversion system includes a plurality of converters and a control unit. The plurality of converters are provided in parallel for each phase of a multi-phase alternating current power system. The control unit uses a plurality of carrier signals having a prescribed phase difference from each other in carrier comparison type pulse width modulation (PWM) control. The control unit detects a current of a primary side of the plurality of converters at each of four or more even-numbered timings when the four or more even-numbered timings are defined at prescribed time intervals during one cycle of a specific carrier signal among the plurality of carrier signals. The control unit generates a reference voltage for the PWM control using a value of the detected current of the primary side and a value of a reference current of the primary side and updates the reference voltage at each of the four or more even-numbered timings. The control unit controls a specific converter among the plurality of converters using the specific carrier signal and the updated reference voltage.

IPC Classes  ?

• H02M 1/14 - Arrangements for reducing ripples from dc input or output
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02M 5/458 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A rack includes first to fourth column members and first and second guide members. A case of an electric device has first and second side surfaces in a width direction that are supported by the first and second guide members, respectively. First and second restriction members are attached to inner surfaces of the first and second side surfaces of the case, respectively, for restricting the case from moving in a front direction of the rack. Second restriction member is attached to face the first restriction member in the width direction. In a state where the electric device is housed within the rack, the first restriction member is located between the first and third column members in a front-back direction. The second restriction member is located between the second and fourth column members in the front-back direction.

IPC Classes  ?

• H05K 5/02 - Casings, cabinets or drawers for electric apparatus - Details
• H05K 7/14 - Mounting supporting structure in casing or on frame or rack
• H05K 7/18 - Construction of rack or frame

Abstract

Provided is an electricity storage system comprising: a plurality of power storage devices capable of discharging and charging direct current power; a plurality of power conversion devices that convert the direct current power stored in the plurality of power storage devices into power corresponding to the load, supplies power to the load on the basis of the direct current power stored in the plurality of power storage devices, converts the power of the load into direct current power corresponding to the plurality of power storage devices, and charges the plurality of power storage devices on the basis of the power on the load side; and a control device that controls power conversion operations of the plurality of power conversion devices, wherein the control device includes a conversion device determining unit that determines the power conversion device to which the operation command is to be transmitted, among the plurality of power conversion devices, and the conversion device determining unit determines the number of power conversion devices to which the operation command is to be transmitted, on the basis of information regarding states of the plurality of power storage devices and the plurality of power conversion devices. This provides an electricity storage system and a control device capable of suppressing power loss.

IPC Classes  ?

• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A control panel (1) according to an embodiment comprises: a housing (2); a unit (10) placed on a base panel (3) inside the housing; a caster (19) that is provided to a bottom section (10d) of the unit and is able to travel on the base panel; an upper section fixing panel (17) that fixes a depth-side upper end (10fu) of the unit when storing the unit; a guiding groove (32) that regulates movements of the caster so that the unit is lowered as far as a fixing position toward the depth side when storing the unit; and a unit fixing part (14) that fixes a depth-side lower end (10fd) of the unit when the entirety of the lower surface of the unit comes into contact with the base panel. As a result, there is provided a control panel with which fixing performance of a unit to a housing is improved, damage to components inside the unit or to connected conductors and cables can be prevented, and ease and workability for taking the unit in and out of the housing can be improved.

IPC Classes  ?

• H02B 1/36 - Racks with withdrawable units
• H05K 5/02 - Casings, cabinets or drawers for electric apparatus - Details

Abstract

A control apparatus for a power conversion system is a control apparatus for a power conversion system including a power converter connected to a power supply or a capacitor through a wire, a coil disposed at a position around the wire where a magnetic flux is linked with the coil when a short-circuit failure in which a voltage of the power supply or the capacitor is short-circuited occurs, the magnetic flux being generated by the short-circuit failure, and a voltage detection circuit configured to detect a voltage value of a voltage across the coil. The control apparatus includes: a voltage acquisition unit configured to acquire the voltage value of the voltage across the coil detected by the voltage detection circuit; and a failure detection unit configured to detect a short-circuit failure of the power converter, based on the voltage value acquired by the voltage acquisition unit.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
• H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Abstract

This DC electric power conversion device comprises a chopper circuit having a first switch that is connected in series to a first connection point and a second connection point, a first diode that is connected in antiparallel to the first switch, a second switch that is connected in series to the first connection point and a third connection point, a second diode that is connected in antiparallel to the second switch, a first capacitor that is connected in series to the second contact point and the third contact point, a second capacitor that is connected in series to the third contact point and a fourth contact point, and a DC power supply and a first reactor that are connected in series to the fourth connection point and the first connection point in the stated order. In the chopper circuit, when a step-up mode is in effect, an electric current path returning to the DC power supply from the DC power supply via the first reactor, the first connection point, the second switch, the third connection point, the second capacitor, and the fourth connection point in the stated order is formed while the first switch is off and the second switch is on, and an electric current path returning to the DC power supply from the DC power supply via the first reactor, the first connection point, the first diode, the second connection point, the first capacitor, the third connection point, the second capacitor, and the fourth connection point in the stated order is formed while the first switch and the second switch are both off. Additionally, in the chopper circuit, when a step-down mode is in effect, an electric current path returning to the second capacitor via the second capacitor, the third connection point, the first capacitor, the second connection point, the first switch, the first connection point, the first reactor, the DC power supply, and the fourth connection point in the stated order is formed while the first switch is on and the second switch is off, and an electric current path returning on the second capacitor via the second capacitor, the third connection point, the second diode, the first connection point, the first reactor, the DC power supply, and the fourth connection point in the stated order is formed while the first switch and the second switch are both off.

IPC Classes  ?

• H02M 3/155 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A load current distribution adjustment device of a power conversion device for energy storage system includes a cross-current calculation unit configured to calculate a cross-current, a first correction amount calculation unit configured to calculate a first correction amount of a voltage command value on the basis of the cross-current calculated and an output voltage of the own power conversion device, a gain calculation unit configured to calculate a weighting gain on the basis of an average voltage of DC voltages and a DC voltage of the own power conversion device, a second correction amount calculation unit configured to calculate a second correction amount of the voltage command value on the basis of the first correction amount and the weighting gain, and an output current control unit configured to control the output current on the basis of the predetermined voltage command value and the second correction amount.

IPC Classes  ?

• H02M 3/155 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A motor driving system according to an embodiment comprises a converter device and an inverter device. The converter device converts a first AC voltage into a DC voltage. The inverter device converts the DC voltage into a second AC voltage and outputs the second AC voltage to a motor. The converter device causes the DC voltage to follow a DC voltage command value. The inverter device causes the speed of the motor to follow a speed command value. The inverter device corrects the speed command value on the basis of the DC voltage command value and the DC voltage. The inverter device applies the corrected speed command value to control the motor.

IPC Classes  ?

• H02P 21/22 - Current control, e.g. using a current control loop
• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Abstract

An uninterruptible power supply apparatus includes an operation unit for setting a second reference voltage, a computation unit that calculates a first reference voltage higher than the set second reference voltage and lower than a maximum value of the first reference voltage, a first reference voltage generation unit that generates the first reference voltage calculated by the computation unit, and a second reference voltage generation unit that generates the second reference voltage set by the operation unit. Thus, a voltage of a DC line can be made lower than the maximum value of the first reference voltage for improved efficiency of the uninterruptible power supply apparatus.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

The purpose of the present disclosure is to provide a vehicle test device, such as a chassis dynamometer, which eliminates the need for advance preparation concerning the tire turning angle and enables an accurate angular displacement amount recognition. Displacement sensors (7L, 7R) according to the present disclosure detect tire turning angles of tires (6L, 6R) using a distance measurement region (90) in the tires (6L, 6R) as detection targets, and acquire angle measurement information (S7L, S7R). A controller (15) receives the angle measurement information (S7L, S7R) from the displacement sensors (7L, 7R), obtains a steering angle that matches the tire turning angles indicated by the angle measurement information (S7L, S7R), and outputs, to a motor drive device (19), steering angle instruction information (SG) that instructs the obtained steering angle. The motor drive device (19) drives a turning motor (42) of roller turning mechanisms (3L, 3R) in accordance with the steering angle instruction information (SG).

IPC Classes  ?

• G01M 17/007 - Wheeled or endless-tracked vehicles

Abstract

A plate crown control device controls tandem rolling equipment based on delivery-side plate crown setting calculation values of stands calculated by setting calculation, mechanical plate crown setting calculation values of the stands, and setting values of bending forces and shift positions of the stands. A processor calculates first learning current values based on differences between mechanical plate crown observation values and mechanical plate crown actual calculation values. The processor prorates first learning values with first learning current values and smoothing gains and updates the first learning values. The processor calculates, in the setting calculation for the next and subsequent materials, setting values of bending forces and shift positions of the stands using mechanical plate crown setting calculation values after correction obtained by adding the first learning values to the mechanical plate crown setting calculation values.

IPC Classes  ?

• B21B 37/38 - Control of flatness or profile during rolling of strip, sheets or plates using roll bending
• B21B 37/16 - Control of thickness, width, diameter or other transverse dimensions

Abstract

An electric power conversion unit includes a housing, a plurality of fans, a heat sink, and a plurality of semiconductor elements. The fan generates a flow of air at an inside of the housing. The heat sink forms a flow path of the air on an upstream side of a flow route of the air at the inside of the housing. The plurality of semiconductor elements is arranged and aligned along a direction which intersects a flow direction of the air in the heat sink on an element arrangement plane of the heat sink.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

In the present invention, regarding first control indexes for steel-sheet winding temperature, four values, i.e., target, simple prediction, detailed prediction, and measured values, are calculated. Additionally, regarding second control indexes for steel-sheet winding temperature, three values, i.e., target, simple prediction, and measured values, are calculated. The target value and the detailed prediction value corresponding to the first control indexes are used for calculating a water spray amount (FF water spray amount) in FF banks. The target values corresponding to the first and second control indexes and the measured values corresponding to the first and second control indexes are used for calculating a water spray amount (FB water spray amount) in FB banks. The water spray amount in the FF banks is controlled on the basis of the positions of segments constituting the steel sheet, an initial water spray amount, and the FF water spray amount. The water spray amount in the FB banks is controlled on the basis of the positions of the segments constituting the steel sheet, an initial water spray amount, and the FB water spray amount.

IPC Classes  ?

• B21B 45/02 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
• B21B 37/76 - Cooling control on the run-out table

Abstract

This plate thickness control device of a rolling mill, which rolls a material-to-be-rolled to obtain a target plate thickness of a product, comprises a thickness deviation learning unit and a gap correction amount calculation unit. The plate thickness deviation learning unit learns a tendency of a plate thickness deviation that is the difference between the plate thickness of a product and the actual plate thickness of a material-to-be-rolled, which is measured in the outlet side of the rolling mill. In addition, the plate thickness deviation learning unit adopts, as the material-to-be-rolled, a material-to-be-rolled intended to be rolled by means of the rolling mill, and predicts, before rolling the material-to-be-rolled, the plate thickness deviation of the material-to-be-rolled on the basis of product information including the kind of steel and the plate thickness of a product of the material-to-be-rolled, and a value of the material-to-be-rolled measured at the upstream side of the rolling mill. The gap correction amount calculation unit calculates a gap correction amount for correcting a roll gap of the rolling mill so as to negate the plate thickness deviation predicted by the plate thickness deviation learning unit. The plate thickness control device of the rolling mill adjusts the roll gap of the rolling mill on the basis of the gap correction amount calculated by the gap correction amount calculation unit before rolling the material-to-be-rolled.

IPC Classes  ?

• B21B 37/20 - Automatic gauge control in tandem mills

Abstract

First to third capacitors (UC1 to UC3) each have an identical shape of a rectangular parallelepiped. The rectangular parallelepiped has a first surface (P1) with a first side and a second side orthogonal to each other, a second surface (P2) with the second side and a third side orthogonal to each other, and a third surface (P3) with the third side and the first side orthogonal to each other. The first side has a length not less than twice and less than three times a length of the third side. The first and second capacitors (UC1, UC2) are arranged such that the first surfaces (P1) thereof are perpendicular to an installation surface (10), the first surfaces (P1) face each other while being spaced apart from each other, and the second surfaces (P2) are horizontal to the installation surface (10). The third capacitor (UC3) is arranged such that the first surface (P1) thereof faces the second surfaces (P2) of the first and second capacitors (UC1, UC2) while being spaced apart from each other and the third surface (P3) thereof is flush with the third surfaces (P3) of the first and second capacitors (UC1, UC2).

IPC Classes  ?

• H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 7/00 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output

Abstract

A power conversion device includes a major circuit part converting a power of a distributed power source into AC power corresponding to a power system, and a controller controlling an operation of the major circuit part; the controller includes an estimated value calculation part and a reactive power calculation part; the estimated value calculation part calculates an estimated value of a resistance component of a system impedance of the power system, an estimated value of a reactance component of the system impedance, and an estimated value of a voltage value of the infinite bus power system based on an active power value of a connection point to the power system, a reactive power value of the connection point, and a voltage value of the connection point.

IPC Classes  ?

• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

This cubicle is an outdoor-installation-type cubicle comprising a surface part formed using a coated sheet metal that is exposed on the outside of the cubicle, and a coating protective member mounted on the edge of the surface part. The coating protective member is provided with a front cover part, a rear cover part, and an edge end cover part. The front cover part contacts the front side of the edge when mounted on the edge of the surface part. The rear cover part contacts the rear side of the edge when mounted on the edge of the surface part. The edge end cover part connects the front cover part and the rear cover part, and wraps around the tip of the edge when mounted on the edge of the surface part. The front cover part, the rear cover part, and the edge end cover part are integrally molded using ASA resin.

IPC Classes  ?

• H02B 1/30 - Cabinet-type casings; Parts thereof or accessories therefor

Abstract

The purpose of the present disclosure is to provide an ultrasonic atomization device capable of obtaining a mist supply amount of raw material solution mist with good responsiveness and accuracy. The ultrasonic atomization device (201) according to the present disclosure comprises: a non-contact type mist supply pipe (40) which is disposed above an atomization vessel (1), including a mist output pipe (1t), without contact with the atomization vessel (1); and a leakage prevention tank (45) which is connected to the mist output pipe (1t) without contact with the non-contact type mist supply pipe (40). The leakage prevention tank (45) accommodates an appropriate sealing liquid (16). At this time, the appropriate sealing liquid (16) is also accommodated inside a liquid accommodation space (SP14) disposed between the leakage prevention tank (45) and the mist output pipe (1t).

IPC Classes  ?

• B05B 17/06 - Apparatus for spraying or atomising liquids or other fluent materials, not covered by any other group of this subclass operating with special methods using ultrasonic vibrations

Abstract

The purpose of the present disclosure is to provide an ultrasonic atomization device that can precisely obtain the mist supply amount of raw material solution mist with good responsivity. An ultrasonic atomization device (101) according to the present disclosure has a non-contact type mist supply pipe (20) above an atomization vessel (1) such that the non-contact type mist supply pipe (20) is not in contact with the atomization vessel (1) including a mist output pipe (1t). A pipe overlapping space (SP12) is provided between a coupling pipe part (23) of the non-contact type mist supply pipe (20) and an upper region (A1t) of the mist output pipe (1t). A leakage prevention gas supply pipe (25) is provided inside the pipe overlapping space (SP12) such that the leakage prevention gas supply pipe (25) is in contact with neither the mist output pipe (1t) nor the non-contact type mist supply pipe (20). The leakage prevention gas supply pipe (25) outputs mist leakage prevention gas (G2) from a gas output port (28) provided in an upper part of the leakage prevention gas supply pipe (25).

IPC Classes  ?

• B05B 17/06 - Apparatus for spraying or atomising liquids or other fluent materials, not covered by any other group of this subclass operating with special methods using ultrasonic vibrations

Abstract

A switching device for charging equipment includes a controller that controls the switching of the connections by a switching part, the switching part includes a plurality of first switching elements provided to correspond respectively to the plurality of power supplies; and a plurality of second switching elements located between each of the plurality of first switching elements and each of the plurality of charging stations, the plurality of second switching elements allow direct current power supplied from the plurality of power supplies to be selectively supplied via the plurality of first switching elements to each of the plurality of charging stations, the controller controls the switching of the connections by the switching part by controlling switching of each of the plurality of first switching elements and the plurality of second switching elements.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• B60L 53/14 - Conductive energy transfer
• B60L 53/30 - Constructional details of charging stations

Abstract

In this uninterruptible power supply system (1), each uninterruptible power supply device (U) includes a reactor (21) and a semiconductor switch (23) which are connected in series between a bypass AC power supply (6) and a load (8). When turning on each semiconductor switch, load current (IL) is shunted to the series connection bodies of the N reactors and semiconductor switches. Accordingly, in comparison with a case without the reactors, it is possible to suppress and reduce variation in the magnitudes of currents (I1 to IN) flowing through the N semiconductor switches, thereby enabling reduction in the size of the semiconductor switch and reduction in cost.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A SCADA web HMI client device comprises a processor and a memory. The memory stores a user access level, image data for an HMI screen, and screen access authority information, all received from a web server. The screen access authority information includes an operation access level of the HMI screen and operation permission/prohibition of the HMI screen by the web browser. The processor draws the HMI screen in an operable state on the web browser in a case where the user access level is greater than or equal to the operation access level and where operation of the HMI screen by the web browser is permitted. The processor draws the HMI screen in an inoperable state on the web browser in a case where the user access level is less than the operation access level or operation of the HMI screen by the web browser is not permitted.

IPC Classes  ?

• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

A solar power generation system includes solar cell panels, power conversion devices, and a control device; the plurality of power conversion devices convert direct current power supplied from the plurality of solar cell panels into alternating current power corresponding to a power system, the plurality of power conversion devices supply, to the power system, the alternating current power; the control device includes a total output value calculation part, a difference calculation part, and an upper limit command value calculation part, the total output value calculation part is configured to calculate a total active power value indicating a magnitude of currently-outputtable active power from all of the plurality of power conversion devices, the difference calculation part is configured to calculate a difference between a total upper limit command value and the total active power value, and calculate a difference per device of the plurality of power conversion devices.

IPC Classes  ?

• H02S 40/32 - Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02S 50/00 - Monitoring or testing of PV systems, e.g. load balancing or fault identification

Abstract

A drive system (1) drives a multi-phase AC motor (2) having a plurality of windings. The drive system (1) includes a first power converter (3U), a second power converter (3V), a first conversion controller (20U), and a second conversion controller (20V). The first power converter (3U) causes a current to flow through a winding of a first phase of the multi-phase AC motor (2). The second power converter (3V) causes a current to flow through a winding of a second phase of the multi-phase AC motor (2). The first conversion controller (20U) decides on either a three-level phase voltage waveform or a five-level phase voltage waveform on the basis of setting information for designating a type of phase voltage waveform and controls the first power converter (3U) so that the decided phase voltage waveform is output from the first power converter (3U). The second conversion controller (20V) controls the second power converter (3V) so that a phase voltage waveform having the same type as the phase voltage waveform of the first power converter (3U) is output from the second power converter (3V) on the basis of the setting information for designating the type of phase voltage waveform.

IPC Classes  ?

• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters
• H02P 27/14 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation with three or more levels of voltage

Abstract

Provided is an electrolytic cell power supply device that comprises: a first converter that converts AC power supplied from a power grid into DC power; a power storage element that performs power storage of the DC power outputted from the first converter; a second converter that converts the DC power stored in the power storage element and supplies the converted power to an electrolytic cell; and a control device that controls operation of the first converter and the second converter. The control device has an anti-corrosion driving mode that, when a power grid outage occurs and on the basis of the DC power stored in the power storage element, controls the operation of the second converter so as to suppress generation, in the electrolytic cell, of a reverse current, which is a current component flowing in the direction opposite to the normal electrolysis direction. Due to this configuration, an electrolytic cell power supply device is provided that enables, using a simpler configuration, suppression of reverse current generation.

IPC Classes  ?

• C25B 15/00 - Operating or servicing cells
• C25B 9/65 - Means for supplying current; Electrode connections; Electric inter-cell connections

Abstract

A control device (15) of this uninterruptible power supply device executes a test mode during execution of an inverter power feed mode to bring a bypass circuit (8) into a conducting state and to reduce an output current (IO) of an inverter (5), thereby determining whether or not the bypass circuit operates normally on the basis of an output voltage (VO) of the inverter. Thus, when the bypass circuit is not operating normally, stop of an operation of a load (23) can be prevented by repairing or replacing the bypass circuit in the event of an inverter failure.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

This uninterruptible power supply includes a switch that is turned off while an AC power supply is normal and turned on during power failure, a converter that converts AC power supplied from the AC power supply into DC power to supply resultant DC power to a DC link portion while the AC power supply is normal, and that supplies DC power supplied from a battery through the switch to the DC link portion during power failure, an inverter that converts DC power from the DC link portion into AC power to supply resultant AC power to a load, and a chopper circuit that allows DC power from the DC link portion to be stored in the battery while the AC power supply is normal.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is a tension control device capable of suppressing a speed overshoot of rolling stock after exiting a final rolling stand of a finishing mill, to improve the accuracy of a stopping position of a tail end of the rewound rolling stock. The tension control device controls the tension of the rolling stock when the rolling stock that has exited the final rolling stand of the finishing mill is being wound onto a mandrel via a pinch roll. The tension control device is configured to be capable of switching a rotational drive of the mandrel between speed control and current control. The tension control device comprises a selecting means for comparing a torque required for speed control and a torque required for current control and selecting the smaller torque as a final torque, and an integrator for integrating an output of the speed control, and is additionally provided with a limit setting unit for setting a limit corresponding to a tension reference for the integrator, the configuration being such that the output of the integrator does not become saturated.

IPC Classes  ?

• B21C 47/02 - Winding-up or coiling

Abstract

A bidirectional chopper (2) selectively performs a charging operation for storing DC power received from DC bus lines (L1, L2) into an electricity storage device (7) and a discharging operation for outputting the DC power of the electricity storage device (7) to the DC bus lines (L1, L2). An inverter (3) converts the DC power received from the DC bus lines (L1, L2) into AC power to supply the AC power to a load (8) and converts a regenerative power generated by the load (8) into DC power to output the DC power to the DC bus lines (L1, L2). In the electricity storage device (7), a SOC reference value is set that is smaller than the upper limit value of an SOC usable range and larger than the lower limit value of the usable range. When an AC power supply (6) is healthy, a control device (5) controls the bidirectional chopper (2) so that the SOC of the electricity storage device (7) becomes the SOC reference value. When the AC power supply (6) is failed, the control device (5) controls, on the basis of the usable range, the discharging operation corresponding to the powering operation of the load (8) and the charging operation corresponding to the regenerative operation of the load (8).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• B66B 1/34 - Control systems of elevators in general - Details
• B66B 5/02 - Applications of checking, fault-correcting or safety devices in elevators responsive to abnormal operating conditions

Abstract

A control device according to one embodiment is for a power conversion device combining a converter for converting AC power to DC power and an inverter for converting DC power to AC power. The control device comprises a DC voltage controller, a compensation calculator, a controller, and a stabilization controller. The DC voltage controller performs a proportional operation and an integral operation on a DC voltage deviation, which is the deviation between a DC voltage detection value related to DC voltage on the DC side of the converter and a DC voltage reference on the DC side, and generates an output value using the results of the proportional operation and the integral operation. The compensation calculator adjusts a compensation amount for suppressing fluctuation of the DC voltage by using a request output value of the inverter. The control unit controls the conversion amount of the converter using a calculation result that is based on the generated output value and the adjusted compensation amount. When a predetermined condition related to the size of the DC voltage deviation and the result of the integral operation is satisfied, the stabilization controller changes the result of the integral operation to a value smaller than the absolute value of the result of the integral operation.

IPC Classes  ?

• H02M 7/12 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A drive device according to a first aspect of an embodiment comprises an impedance adjusting unit. The impedance adjusting unit uses a current value flowing through elements of a power converter and adjusts the impedance of a path for sending a control signal from a drive unit of the elements to a semiconductor switching element among the elements.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A frequency stabilization system according to one aspect of the present invention comprises: a power conversion unit that converts, into AC power, DC power output by a solar panel and/or a storage battery, and outputs the AC power to a power grid; a bidirectional DC converter that is connected in series to the storage battery, and controls, on the basis of an effective power command value, the charging and discharging of the power conversion unit by the storage battery; a grid frequency detection unit that detects the grid frequency of AC power output to the power grid by the power conversion unit; a required power calculation unit that calculates the required power for the power grid on the basis of the detected grid frequency; a command value calculation unit that calculates the effective power command value for the bidirectional DC converter on the basis of the calculated required power; and an output control unit that, on the basis of the calculated effective power command value, controls charging and discharging outputs to the power conversion unit of the storage battery by the bidirectional DC converter.

IPC Classes  ?

• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

First and second bases (21) are positioned opposite each other. An inverter (23) is mounted on one of the first and second bases (21). A converter (24) is mounted on the first base (21a). A chopper (25) is mounted on the second base (21b). At least a portion of fins (22) thermally connected to the converter (24) via the first base (21a) is thermally connected to the chopper (25) via the second base (21b).

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

In the present invention, an electric power converter comprises a housing, and first and second three-phase block semiconductor units of identical structure within the housing, wherein: each of the first and second three-phase block semiconductor units has a cooler, a semiconductor, a gate driver substrate, a first AC terminal, a second AC terminal, and a third AC terminal; the first AC terminals, the second AC terminals, and the third AC terminals are positioned facing each other within the housing so that the coolers are arranged on the outer side within the housing and so that the semiconductors, the gate driver substrates, the first AC terminals, the second AC terminals, and the third AC terminals are arranged on the inner side within the housing; the first three-phase block semiconductor unit is configured so that, due to a signal distribution substrate provided to the electric power converter, a U-phase signal is transmitted to the first AC terminal, a V-phase signal is transmitted to the second AC terminal, and a W-phase signal is transmitted to the third AC terminal; and the second three-phase block semiconductor unit is configured so that, due to the signal distribution substrate provided to the electric power converter, wiring is switched so that a U phase and a W phase are reversed, a W-phase signal being transmitted to the first AC terminal, a V-phase signal being transmitted to the second AC terminal, and a U-phase signal being transmitted to the third AC terminal.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

The purpose of the present disclosure is to provide an ultrasonic atomization device that can precisely detect the liquid surface level of a raw material solution. In an ultrasonic atomization device (100) of the present disclosure, a raw material solution separation pipe (20) is provided to a side surface of an atomization container (1). The raw material solution separation pipe (20) has a raw material solution accommodation space (22) that is for accommodating a raw material solution (15) and a raw material solution passage port (20B) that is for performing supply and discharge of the raw material solution (15) between a raw material solution container and the raw material solution separation pipe (20). A liquid surface detector (40) is provided in proximity to the raw material solution separation pipe (20). The liquid surface detector (40) detects the level of the liquid surface (15A) of the raw material solution (15) in the raw material solution accommodation space (22) and outputs a liquid surface detection signal (S40) indicating the detected level of the liquid surface (15A).

IPC Classes  ?

• B05B 17/06 - Apparatus for spraying or atomising liquids or other fluent materials, not covered by any other group of this subclass operating with special methods using ultrasonic vibrations

Abstract

A power conversion device includes a first relay unit, one or more second relay units, and a safety control unit. The first relay unit includes a first logic processing unit that transmits a response signal supplied from a first power conversion unit and a response signal of a downstream side of its first relay unit to an upstream side. Each of the one or more second relay units includes a second logic processing unit that transmits a response signal transmitted from one second power conversion unit among the one or more second power conversion units and a response signal transmitted from a downstream side of the one second relay unit to an upstream side of the one second relay unit. The safety control unit is disposed on an upstream side of the first logic processing unit and configured to perform functional safety control of the first power conversion unit and the one or more second power conversion units by transmitting a control command for functional safety control to the first relay unit and thus monitor a state of the functional safety control of the first power conversion unit and states of the functional safety control of the one or more second power conversion units.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters

Abstract

The purpose of the present disclosure is to provide an active gas generation device having a structure for preventing dielectric breakdown of a dielectric film. In an electrode unit (51) of an active gas generation device (71) according to the present disclosure, a dielectric film support member (10) has a support surface (10F) that supports a high voltage–side dielectric film (2) from below. The lower surface of a dielectric film suppression member (11) provided above a ground-side dielectric film (3) has: a dielectric substance contact area (112) that overlaps a peripheral area of the high voltage–side dielectric film (2) and the support surface (10F) of the dielectric film support member (10) in a plan view; and a dielectric substance non-contact area (111) that overlaps an intermediate area of the high voltage–side dielectric film (2) in a plan view. The high voltage–side dielectric film (2) is suppressed from the dielectric substance contact area (112) thereabove by the dielectric film suppression member (11) that receives the pressing force of a plurality of suppression assist members (32).

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

A power supply system for an independent system includes a plurality of power supply devices, a plurality of power conversion devices, and a control device, the plurality of power conversion devices are connected in parallel to the independent system, the plurality of power conversion devices are voltage source voltage-controlled, the plurality of power conversion devices convert power supplied from the plurality of power supply devices into alternating current power corresponding to the independent system, the plurality of power conversion devices supply the alternating current power after the conversion to the independent system, the control device controls conversion operations of the power of the plurality of power conversion devices, the control device calculates a plurality of active power command values of the plurality of power conversion devices according to active power required by the independent system, and calculates a plurality of reactive power command values.

IPC Classes  ?

• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02M 7/493 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

A phase angle detection system according to one aspect of an embodiment of the present invention detects the phase angle of an electric motor in a drive system equipped with a transmission unit that changes the rotation speed of the electric motor. This phase angle detection system comprises: a first sensor; a second sensor; and an arithmetic processing unit. The first sensor outputs a first signal for detecting at least a specific phase angle of a rotor of the electric motor. The second sensor outputs a second signal that enables the detection of the amount of rotation of an output shaft of the transmission unit. In the arithmetic processing unit, the amount of deviation included in a detection result of the specific phase angle from the first signal is predefined for each rotational direction of the electric motor, and the deviation amount of the first signal determined by the rotational direction of the electric motor, the detection result of the first signal, and the second signal are used to calculate an estimated value of the absolute angle of the rotor of the electric motor.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position

Abstract

A drive equipment includes a transformer, a power converter, and a control system. The transformer is configured with a primary winding and a secondary winding, and a winding of an electric motor is connected to the secondary winding. The power converter causes a current to flow through the primary winding of the transformer. The control system performs constant current control on the power converter during a period of a first stage after startup of the electric motor is instructed, to reduce a variation in a current flowing through the primary winding of the transformer, and controls the power converter through variable voltage variable frequency control of the electric motor in a second stage after the first stage.

IPC Classes  ?

• H02M 3/335 - Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters
• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Abstract

A drive system according to an aspect of the embodiment includes a first phase estimation unit, a second phase estimation unit, a state determination unit, and a drive control unit. The first phase estimation unit generates a first phase obtained by estimating a phase of a rotor on the basis of an initial phase at a startup stage of the synchronous motor. The second phase estimation unit generates a second phase obtained by estimating the phase of the rotating rotor on the basis of the operation state of the synchronous motor. The state determination unit determines the operation state of the synchronous motor. The drive control unit controls the driving of the synchronous motor by using any one of the first phase and the second phase according to the determination result of the operation state of the synchronous motor. The first phase estimation unit corrects the first phase by using the detection result of the rotor position detected from the start of the startup procedure of the synchronous motor to the successful startup.

IPC Classes  ?

• H02P 21/18 - Estimation of position or speed
• H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
• H02P 21/34 - Arrangements for starting
• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Abstract

Provided is a control device in a power conversion device for photovoltaic power generation connected with solar panels at a DC side, wherein the control device comprises: a modulation rate calculation unit which calculates a modulation rate on the basis of a DC voltage of the DC side of the power conversion device and a system voltage RMS value of an AC side of the power conversion device; a limiter adjustment unit which calculates a lower limit limiter operation value on the basis of a prescribed lower limiter setting value, the system voltage RMS value, and a prescribed rated value in response to the modulation rate calculated by the modulation rate calculation unit; a limiter which updates a DC voltage command lower limit limiter on the basis of the lower limit limiter operation value calculated by the limiter adjustment unit; a maximum power point follow-up control unit which performs a maximum power point follow-up control on the basis of DC power generated by the solar panels to calculate a first DC voltage command value, and determines a second DC voltage command value on the basis of the calculated first DC voltage command value and the DC voltage command lower limit limiter set in the limiter; and an inverter control unit which controls an inverter in the power conversion device on the basis of the second DC voltage command value determined by the maximum power point follow-up control unit.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• G05F 1/67 - Regulating electric power to the maximum power available from a generator, e.g. from solar cell

Abstract

In the present uninterruptible power supply apparatus, in a switching period in which a bypass power feed mode is switched to an inverter power feed mode, a semiconductor switch is turned on, a first electromagnetic contactor is turned off, a second electromagnetic contactor is turned on and, in this state, an inverter is activated to start a lap power feed mode, and the semiconductor switch is turned off to end the lap power feed mode. Accordingly, the lap power feed mode can be completed in a short time to reduce an increase of a terminal-to-terminal voltage of a capacitor and thereby prevent the terminal-to-terminal voltage of the capacitor from exceeding an upper limit voltage.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is a rolling risk presentation device that can present a rolling risk to an operator in a rolling plant such that countermeasures for suppressing and preventing the occurrence of an alarm are taken prior to rolling. The rolling risk presentation device comprises a system database, an alarm history information classification unit, an occurrence probability calculation unit, and a rolling risk presentation unit. The system database stores alarm history information including alarms generated in the past during rolling. The alarm history information classification unit classifies and organizes the alarm history information, that is stored in the system database, by each type of material to be rolled and product size. The occurrence probability calculation unit statistically calculates the number of occurrences of each alarm classified and organized by the alarm history information classification unit for each type of material to be rolled and product size, and calculates the probability of occurrence of each alarm. The rolling risk presentation unit displays the occurrence probability calculated by the occurrence probability calculation unit for each alarm, and thereby presents, to the operator in the rolling plant and before rolling of the material to be rolled, the rolling risks that may occur during rolling of the material to be rolled.

IPC Classes  ?

• B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
• B21B 33/00 - Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls
• G05B 23/02 - Electric testing or monitoring

Abstract

In the present invention, a first communication line (F1) transmits a control signal (S) from an interface circuit (34) to an n-th drive circuit (GDn) in sequence via a first drive circuit (GD1). A second communication line (F2) transmits a semiconductor switch state detection signal (DS) from the n-th drive circuit (GDn) to the interface circuit (34) in sequence via the first drive circuit (GD1). An i-th drive circuit (GDi) includes a driver for driving an i-th semiconductor switch (SWi) in response to the control signal (S), an abnormality detection circuit for detecting an abnormality of the i-th semiconductor switch (SWi), and first and second notification members (A1, A2). The abnormality detection circuit detects an abnormality of the i-th semiconductor switch (SWi) on the basis of the control signal (S) and an operating state of the i-th semiconductor switch (SWi) and notifies of the detection result by using the first notification member (A1). The abnormality detection circuit generates state detection signals indicating operating states of the i-th to the n-th semiconductor switches (SWi to SWn), detects mismatch between the control signal (S) and the operating states of the i-th to the n-th semiconductor switches (SWi to SWn) on the basis of the control signal (S) and the state detection signals, and notifies of the detection result by using the second notification member (A2).

IPC Classes  ?

• H02H 7/00 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm
• H02H 3/05 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details with means for increasing reliability, e.g. redundancy arrangements
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A power supply device according to the embodiment supplies DC power to an electrolytic cell that generates hydrogen through electrolysis. This power supply device comprises: a self-excited power converter including a first output terminal and a second output terminal that outputs a positive voltage with respect to the first output terminal; a reactor serially connected to at least one of the first output terminal and the second output terminal; and a filter circuit connected between an anode and a cathode of the electrolytic cell. The filter circuit is a low-pass filter. The cutoff frequency of the filter circuit is set to be lower than the switching frequency of the power converter.

IPC Classes  ?

• C25B 9/65 - Means for supplying current; Electrode connections; Electric inter-cell connections
• H02M 7/02 - Conversion of ac power input into dc power output without possibility of reversal

Abstract

A drive system of an embodiment includes an initial phase command generation unit, a rotor phase detection unit, and a drive control unit. The initial phase command generation unit generates a phase command value corresponding to an initial phase of a rotor before startup of a synchronous motor. The rotor phase detection unit detects a phase of the rotor and outputs the phase. The drive control unit controls the driving of the synchronous motor by using the phase command value. The initial phase command generation unit adjusts the phase command value to approach the phase of the rotor of a detection result by using the detection result of the phase of the rotor detected before the startup by the rotor phase detection unit.

IPC Classes  ?

• H02P 21/09 - Field phase angle calculation based on rotor voltage equation by adding slip frequency and speed proportional frequency

Abstract

In a mist flow rate measuring apparatus of the present disclosure, in a transparent pipe, a camera executes imaging processing of reflected light, the imaging processing having at least a part of a mist flowing region through which a mist-containing gas flows set as an imaging target region, and acquires imaging information. A mist flow rate calculation unit executes mist flow rate calculation processing based on the imaging information. The mist flow rate calculation processing includes sum value calculation processing of obtaining a luminance sum value, which is a sum of a plurality of luminance values indicated by the imaging information, and flow rate derivation processing of deriving the flow rate of the raw material mist from the luminance sum value.

IPC Classes  ?

• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
• G01F 1/7086 - Measuring the time taken to traverse a fixed distance using optical detecting arrangements

Abstract

The purpose of the present disclosure is to provide an active gas generation device capable of supplying a high-concentration active gas. In an active gas generation device (5) according to the present disclosure, a first number of high-voltage electrode structures (13) are each held inside a holding space (S54) of a corresponding groove (54) among a first number of grooves (54), and a second number of grounding electrode structures (14, 3, 4) are each held inside a holding space (S54) of a corresponding groove (54) among a second number of grooves (54). The first number of high-voltage electrode structures (13) and the second number of grounding electrode structures (14, 3, 4) are alternately disposed in a Y-direction. A first planar region of each of the first number of high-voltage electrode structures (13) and a second planar region of each of the second number of grounding electrode structures (14, 3, 4) face each other with a separation space (S56) therebetween.

IPC Classes  ?

• H05H 1/24 - Generating plasma

Abstract

Provided is a camber control device for a continuous rolling mill, capable of reducing a camber in a tip part of a rolling material and suppressing the occurrence of telescoping of a steel strip coil. In this invention, a tip camber measurement unit calculates a tip camber measurement value at a rolling material tip part on the basis of a meandering amount of the rolling material detected by a meandering amount detector. A camber rectification leveling computation unit calculates a camber rectification leveling amount on the basis of the tip camber measurement value. A tip leveling setting unit sets a tip leveling control length and a tip leveling correction amount for reducing the tip camber for a reduction leveling device of each rolling stand. A reduction leveling control unit adjusts the reduction leveling device to a tip-leveling-correction-amount-added position before the rolling material enters the each rolling stand and adjusts the position of the reduction leveling device in such a manner that the tip leveling correction amount gradually decreases after the rolling length at the each rolling stand has reached the tip leveling control length.

IPC Classes  ?

• B21B 37/58 - Roll-force control; Roll-gap control
• B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
• B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
• B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses

Abstract

An assembly jig for a power conversion apparatus, comprising: a pair of fixing portions (11, 15) arranged so as to oppose each other in a first direction orthogonal to an up-down direction; and a supporting member (21) which is provided so as to be attachable from below to a pair of insulating frames (121, 122) fixed to the pair of fixing portions (11, 15) so as to oppose each other in a second direction orthogonal to the up-down direction and first direction and which is for supporting, in the state of being attached to the pair of insulating frames (121, 122), heat dissipation plates and power semiconductor elements that are alternately arranged to be stacked in the first direction between the pair of insulating frames (121, 122), wherein the supporting member (21) comprises a guide portion that, when the heat dissipation plates and power semiconductor elements having been stacked are pressure-welded to each other in the first direction, guides the movements of the heat dissipation plates and power semiconductor elements in the first direction.

IPC Classes  ?

• H01L 23/40 - Mountings or securing means for detachable cooling or heating arrangements
• H01L 25/10 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices all the devices being of a type provided for in the same subgroup of groups , or in a single subclass of , , e.g. assemblies of rectifier diodes the devices having separate containers
• H01L 25/11 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices all the devices being of a type provided for in the same subgroup of groups , or in a single subclass of , , e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in group
• H01L 25/18 - Assemblies consisting of a plurality of individual semiconductor or other solid state devices the devices being of types provided for in two or more different subgroups of the same main group of groups , or in a single subclass of ,

Abstract

An overtemperature detecting system according to an embodiment detects a temperature abnormality of a dry-type transformer (hereinafter, referred to as a transformer) cooled by a cooling device. The overtemperature detecting system includes a temperature determining unit. The temperature determining unit determines and outputs a temperature abnormality of the transformer by changing determination conditions of the temperature abnormality of the transformer using operation states during operating and during stopping of the cooling device.

IPC Classes  ?

• H01F 27/08 - Cooling; Ventilating

Abstract

In a mist flow rate measuring apparatus of the present disclosure, an external discharge pipe is constituted of a combination of an upstream pipe, a large-diameter transparent pipe, and a downstream pipe. A part of a mist flowing region in the large-diameter transparent pipe is an imaging target region of a mist imaging camera. An inner diameter D31 of the large-diameter transparent pipe is set to a value larger than an inner diameter D7 of the upstream pipe and an inner diameter D8 of the downstream pipe. That is, the large-diameter transparent pipe, the upstream pipe, and the downstream pipe have a magnitude relationship with respect to the inner diameter of {D31>D7=D8}.

IPC Classes  ?

• G01F 1/7086 - Measuring the time taken to traverse a fixed distance using optical detecting arrangements
• G01F 1/74 - Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid

Abstract

The present disclosure provides a low-cost power conversion system that allows for lower loss and less space to be required. The power conversion system comprises: a power converter that converts DC power inputted from a DC power supply to AC power or DC power; a capacitor provided between a positive pole DC line and a negative pole DC line connected to an input terminal of the power converter; a ground line that connects the negative pole DC line and a ground potential and that is provided with a first grounding resistor; a discharge line that connects the positive pole DC line and the ground line on the ground potential side of the first grounding resistor; and a discharge switch that is provided in the discharge line and is turned ON when discharging the residual charge in the capacitor.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A design assistance device (2) is configured to comprise: a data acquisition unit (11) for acquiring, as candidate design data for an electric motor, a plurality of pieces of candidate design data that include a plurality of design parameters, and acquiring a first evaluation value for each of the plurality of pieces of candidate design data; and a data generation unit (13) that selects, from among the plurality of pieces of candidate design data acquired by the data acquisition unit (11), some pieces of candidate design data from the first place in the descending order of the first evaluation value as a plurality of pieces of first candidate design data and generates, from the plurality of pieces of first candidate design data, a plurality of pieces of second candidate design data including the plurality of design parameters. In addition, the design assistance device (2) comprises: an evaluation value calculation unit (14) that calculates a second evaluation value for each piece of the first candidate design data on the basis of the plurality of design parameters contained in this piece of the first candidate design data and calculates the second evaluation value for each piece of the second candidate design data on the basis of the plurality of design parameters contained in this piece of the second candidate design data; and a design data selection unit (15) for using the second evaluation values calculated by the evaluation value calculation unit (14) to select, from among the plurality of pieces of first candidate design data and the plurality of pieces of second candidate design data, candidate design data to be used as the design data for the electric motor.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 111/06 - Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]

Abstract

The present disclosure relates to a tail end buckling suppression device for a tandem rolling mill rolling a material to be rolled by N (N≥2) successive rolling stands. Each i-th rolling stand (1≤i≤N) of the tandem rolling mill includes an i-th roll bender device screwing down the material to be rolled with preset roll bender pressure. During a period after a tail end of the material to be rolled comes out of one designated j-th rolling stand (1≤j≤N−1) until the tail end of the material to be rolled comes out of the N-th rolling stand, the tail end buckling suppression device causes each of j+1-th to N-th roll bender devices downstream of the j-th rolling stand to continuously lower the roll bender pressure.

IPC Classes  ?

• B21B 37/66 - Roll eccentricity compensation systems
• B21B 31/02 - Rolling stand frames; Roll mountings

Abstract

This electric power conversion control device comprises: an optical fiber; an optical detection part; and a protection control part. The optical fiber is formed to guide light taken in through the side surface of an extending light guide part in the extension direction and to output the light from an end of the light guide part. The optical detection part detects the light guided to the end of the light guide part. When the optical detection part has detected light resulting from an accident accompanied by arc flash, the protection control part halts electric power conversion carried out by an electric power converter relating to the optical fiber.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

Provided is an EV charging facility comprising: a plurality of charging stands that, by being attachably/detachably connected to EVs, charge power storage devices mounted to the connected EVs; a plurality of power supply circuits that convert power fed from a power system side into DC power corresponding to the EVs and feed the converted DC power to any of the charging stands; a charging and discharging stand that, by being attachably/detachably connected to an EV, charges and discharges a power storage device mounted to the connected EV; and a bidirectional converter that performs bidirectional power conversion in a direction in which the power storage device of the EV connected to the charging and discharging stand is charged and a direction in which the power storage device of the EV connected to the charging and discharging stand is discharged. Accordingly, it is possible to provide an EV charging facility which comprises a plurality of charging stands and which can reduce contracted power with a simpler configuration, and an operation method therefor.

IPC Classes  ?

• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers

Abstract

According to one embodiment of the present invention, an inverter apparatus (100) comprises: a power converter (101) for an armature winding; a power converter (102) for a field winding; a velocity control unit (110) which controls three-phase current on dq-axes; a field current control unit (120) which controls field winding current; a simulator (130); and a damper winding failure detection device (200). The damper winding failure detection unit (200) has: a switching unit (210) which switches between a normal operation mode and a failure inspection mode; an inspection current command value generation unit (220) which outputs an AC as a q-axis current command and outputs a DC equivalent value as a d-axis current command in the failure inspection mode; and an inspection time measurement/determination unit (230) which measures a response in a field winding (13) and determines, from a response signal, the presence or absence of anomaly in the damper winding.

IPC Classes  ?

• H02P 23/00 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control
• H02P 6/32 - Arrangements for controlling wound field motors, e.g. motors with exciter coils
• H02P 25/022 - Synchronous motors

Abstract

This electromagnetic wave detection device detects electromagnetic waves from an electromagnetic wave generation source (100) in a first space A in which the electromagnetic wave generation source (100) is disposed and a second space B that is divided by a partitioning plate (200) which attenuates the propagation of electromagnetic waves. The electromagnetic wave detection device comprises an electromagnetic wave observation part (10) comprising a metal wire including: a penetration section (11) that penetrates through a through hole (200A) formed in the partitioning plate (200) while being spaced apart from a peripheral wall of the through hole; a protrusion section (12) that protrudes from the penetration section (11) toward the first space A, and receives electromagnetic waves from the electromagnetic wave generation source (100); and an extension section (13) that extends from the penetration section (11) into the second space B. One end of the electromagnetic wave observation part that is positioned on the second space B side is connected to a ground contact point (300) positioned on the second space B side.

IPC Classes  ?

• G01R 29/08 - Measuring electromagnetic field characteristics
• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A sub-module of a power conversion device includes: an IGBT, a drive circuit that drives the IGBT, a laminated bus bar on which the IGBT is mounted; a substrate on which the drive circuit is mounted; a housing frame for accommodating the IGBT, the drive circuit, the laminated bus bar, and the substrate; and a separation frame for separating a space in which the drive circuit and the substrate are disposed from a space in which the IGBT and the laminated bus bar are disposed.

IPC Classes  ?

• H02M 7/00 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
• H02M 7/5387 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

The present disclosure provides a hot rolling mill plate thickness control device capable of reliably threading a tip end portion of material being rolled, without increasing equipment costs, even if the material being rolled is being rolled to be extremely thin. The hot rolling mill plate thickness control device comprises: a plate thickness gauge installed on an exit side of a final rolling stand in a row-arrangement direction; a gap calculating unit for calculating a gap between rolls of each rolling stand, said gap being greater than a product target plate thickness of the material being rolled and corresponding to a threadable plate thickness with which the tip end portion of the material being rolled can be stably threaded; a gap setting unit for setting the gap calculated by the gap calculating unit for each rolling stand; an automatic plate thickness control unit for executing automatic plate thickness control to minimize a plate-thickness deviation between a plate thickness measured value from the plate thickness gauge and the threadable plate thickness; and a target plate thickness changing unit for changing the threadable plate thickness to the product target plate thickness by adding a plate-thickness bias to the plate-thickness deviation with a predetermined ramp rate, after the tip end portion of the material being rolled has been threaded through the final rolling stand.

IPC Classes  ?

• B21B 37/20 - Automatic gauge control in tandem mills

Abstract

This control device comprises: a first action control unit that causes a DC switch to open when a power conversion device is in a standby state and when a first DC voltage value acquired by a voltage acquiring unit has become greater than a predetermined first threshold; a clock unit that, when the DC switch is opened by the first action control unit, clocks the elapsed time after the DC switch has been opened; and a soundness determining unit that when the DC switch is opened while the power conversion device is in the standby mode and when the elapsed time period clocked by the clock unit has reached or exceeded a predetermined first time period, calculates a first differential voltage value that is the difference between the first DC voltage value acquired by the voltage acquiring unit and a second DC voltage value, determines that the DC switch is normal when the first differential voltage value is greater than a predetermined second threshold, and determines that the DC switch is abnormal when the first differential voltage value is equal to or less than the predetermined second threshold.

IPC Classes  ?

• H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
• G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

The daisy chain communication path of this power conversion system connects a master station that controls a plurality of slave stations each including a power conversion device and the plurality of slave stations to each other. The plurality of slave stations are configured so as to supply power from the power conversion device within each slave station to each load device. The plurality of slave stations switch between "operation" for supplying power from the power conversion devices and "stop" for interrupting the supply of the power to supply the power to the respective load devices. The daisy chain communication path forms a set of a first communication path for sending a control signal α and a second communication path for sending an operation permission signal β. When detecting a communication failure, each of the plurality of slave stations "stops" the supply of power to the power conversion device of a relevant slave station that has detected the communication failure and controls the other slave stations among the plurality of slave stations using the control signal α and the operation permission signal β to "stop" the supply of the power to the power conversion devices of the other slave stations. After that, in a state in which the power supply from each power conversion device is "stopped", the whole or a part of the plurality of slave stations notify, using the control signal α, the master station of information about a failure location in which the failure location is identifiably specified.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 7/49 - Combination of the output voltage waveforms of a plurality of converters

Abstract

This DC power distribution system comprises a DC bus line (100) distributing DC power, a first power converter (CPL), and a voltage stabilizing device (10). The first power converter (CPL) is connected between the DC bus line (100) and a load and converts the DC power from the DC bus line (100) to the power required by the load. The voltage stabilizing device (10) is connected to the DC bus line (100) in parallel with the first power converter (CPL). The voltage stabilizing device (10) supplies power to the DC bus line (100) in accordance with the variation of an input voltage input from the DC bus line (100) to the first power converter (CPL) and the DC power supplied from the DC bus line (100) to the first power converter (CPL).

IPC Classes  ?

• H02J 1/00 - Circuit arrangements for dc mains or dc distribution networks

Abstract

An uninterruptible power supply system includes: a group of electrical components that constitute the uninterruptible power supply system and are disposed in a first block of the housing; the other group of electrical components that constitute the uninterruptible power supply system and are disposed in a second block of the housing; and a partition structure disposed adjacent to an exhaust side of the second block to adjust an air flow flowing through the first block and the second block.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

One direction discharge structure in an active gas generation apparatus satisfies arrangement conditions (a) to (c). The condition (a) is a condition that a region where a corresponding metal electrode and a corresponding metal electrode are overlapped with each other in a plan view serves as a corresponding discharge space in a corresponding gap region. The condition (b) is a condition that the corresponding gap region and a plurality of gas supply holes provided in a corresponding gas supply region are overlapped with each other in a plan view. The condition (c) is a condition that the plurality of gas supply holes provided in the corresponding gas supply region and a plurality of gas ejection holes provided below the corresponding gap region sandwich the corresponding discharge space in a plan view, and are disposed to face each other on a one-to-one basis along a Y direction.

IPC Classes  ?

• H01J 37/32 - Gas-filled discharge tubes

Abstract

A main controller includes a first programmable device, a device, and a first selector. Each controller includes a second programmable device and a second selector. The second programmable device includes a memory and a processor. The first selector connects the first programmable device to a serial communications line when the uninterruptible power supply is in operation. In response to the device receiving an instruction to perform an update process, the first selector connects the device to the serial communications line. The second selector connects the processor to the serial communications line when the uninterruptible power supply is in operation. In response to the processor receiving the instruction to perform the update process from the first programmable device while the uninterruptible power supply is in operation, the second selector connects the memory to the serial communications line.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• G06F 1/26 - Power supply means, e.g. regulation thereof

Abstract

In an ultrasonic joining apparatus according to the present disclosure, an ultrasonic joining apparatus control board controls an operation of a lead set unit and a tension adjustment unit including a dancer roller to perform joining tension control processing. The joining tension control processing includes steps of: making a lead wire housing mechanism perform a rewinding driving of rewinding a lead wire in a lead cassette when the dancer roller reaches a lower limit adjustment position in a tension adjustment range; and making the lead wire housing mechanism perform a delivery driving of sending out the lead wire from the lead cassette when the dancer roller reaches an upper limit adjustment position in the tension adjustment range.

IPC Classes  ?

• B23K 20/26 - Auxiliary equipment
• B23K 20/00 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
• B23K 20/10 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding

Abstract

This sheet width control device is applicable to a reversing rolling mill that comprises: an edger that has a pair of edger rolls that perform edge rolling on a material being rolled; and a horizontal rolling mill that is disposed downstream of the edger and has a pair of horizontal rolls that perform horizontal rolling on the material being rolled. The sheet width control device comprises a reduction control device, a reduction position detector, a tracking device, and a sheet width actual value calculation device. The reduction control device is configured to cause the edger to operate such that the pair of edger rolls make contact with the material being rolled during reverse pass rolling. The reduction position detector is configured to detect the reduction position of the edger when the pair of edger rolls are in contact with the material being rolled during reverse pass rolling. The tracking device is configured to track the position in the longitudinal direction of the material being rolled during reverse pass rolling. The sheet width actual value calculation device is configured to calculate a sheet width actual value for the material being rolled at a plurality of positions in the longitudinal direction on the basis of the output of the reduction position detector and the output of the tracking device.

IPC Classes  ?

• B21B 38/04 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• B21B 37/22 - Lateral spread control; Width control, e.g. by edge rolling

Abstract

A first current detector detects an output current of a modular uninterruptible power supply apparatus. Each of a plurality of power conversion modules includes a resistive element and a second switch. The second switch connects the first current detector and the resistive element in parallel in an ON state. Each of first control circuits turns on the second switch when setting a corresponding power conversion module to an operating state, and turns off the second switch when setting the power conversion module to a stopped state. Each of the first control circuits detects a shared current of the corresponding power conversion module based on a current flowing through the resistive element when the second switch is in the ON state. Each of the first control circuits controls a power converter such that an output current of the power conversion module matches the shared current.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion

Abstract

This method for assisting operation in a rolling line comprises a step for acquiring various data related to a rolled product manufactured on the rolling line. The method comprises: a step for calculating, for each product specification and on the basis of the various data, an occurrence rate of errors occurring in at least one of the quality of a rolled product, the operating status of a rolling line, and operator operations on actuators of the rolling line; and a step for setting, for each product specification and in accordance with how high the occurrence rate is, the manufacturing difficulty of the rolled product. The method further comprises a step for outputting assistance data from an operator terminal to assist an operator who is involved in a manufacturing process of an object to be manufactured on the rolling line, the assistance data comprising, as data on the manufacturing difficulty of the object to be manufactured, data on the manufacturing difficulty of a rolled product having the same product specifications as the product specifications of the object to be manufactured.

IPC Classes  ?

• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby

Abstract

The present disclosure provides a plate thickness control method for a rolling mill whereby it is possible to calculate an appropriate gap correction amount for the rolling mill on the basis of the amount of change in a rolling load between a previous material and a material in question, and to thus improve plate thickness precision. The plate thickness control method for a rolling mill includes: a step in which a rolled coil rolled immediately beforehand by a rolling mill is designated as a previous material, a rolled coil rolled after the previous material is designated as a material in question, the relationship between the amount of change in a rolling load between the previous material and the material in question and the amount of change in a gap error regarding the rolling mill is approximated sequentially by means of a regression model, and a gap error in the rolling of the material in question is predicted on the basis of the regression model; a step in which a gap setting amount in rolling of the material in question is corrected on the basis of the predicted value of the gap error; and a step in which a regression coefficient of the regression model is updated on the basis of the actual rolling load obtained by rolling the material in question and the amount of change in the actual gap error.

IPC Classes  ?

• B21B 37/58 - Roll-force control; Roll-gap control
• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/64 - Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands

Abstract

A winding control system according to one embodiment comprises: a motor drive control device that controls the driving of a motor which rotationally drives a mandrel for winding a rolled material around a coil; a tail end sensor that detects one point of the rolled material to thereby output a detection signal indicating that the rolled material passes through a tail end; a winding control device that tracks the position of the tail end; a first camera that is provided between the finishing roll mill and the mandrel and captures images for first image data including information about the shape of the tail end; and an image analysis device that performs image analysis on the first image data at a timing at which the detection signal is emitted, generates a correction value for correcting the position of the tail end on the basis of a result of the image analysis of the image data, and outputs the correction value to the winding control device. The winding control device corrects the position of the tail end by using the correction value.

IPC Classes  ?

• B21C 47/02 - Winding-up or coiling
• B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses

Abstract

The power supply device according to an embodiment comprises: a power conversion unit including first input terminals, a first capacitor connected between the first input terminals, a first output terminal that supplies output current to an electromagnet, a first power conversion circuit connected between the capacitor and the output terminal, and first wiring that electrically connects the capacitor and the power conversion circuit to each other; and a control device that controls the power conversion unit on the basis of current command values sequentially supplied from the outside. The control device detects the sequential two maximal current values or sequential two minimal current values of the current command values to estimate the frequency of the output current.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

The present disclosure provides a thickness schedule calculation method and a rolling plant that make it possible to calculate and set a limit value for a limit check that is preferable for maintaining a stable rolling and operating state with reduced rolling troubles. The thickness schedule computing method comprises a computing step of computing a thickness schedule by using a rolling model formula including a forward slip model and a rolling load model, on the basis of a rolling load or motor power. The computing step includes a calculating step of calculating at least one of an upper limit value and a lower limit value of the rolling reduction ratio in each rolling stand on the basis of past rolling data, for each product specifications including a steel type category for rolling and a thickness category, and a setting step of setting at least one of the upper limit value and the lower limit value calculated in the calculating step as a limit value for a limit check with respect to the rolling reduction ratio.

IPC Classes  ?

• B21B 37/20 - Automatic gauge control in tandem mills
• B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby

Abstract

In the present invention, a command value limiter applies limits to command values which are issued by a host device and which are for charging power and discharging power. A drive signal generator generates a drive signal for an inverter circuit in accordance with a command value for charging power limited by the command value limiter or a command value for discharging power limited by the command value limiter. A PI controller, in response to a direct-current voltage that is applied to the inverter circuit being higher than the working voltage of a charging limiter, calculates a PI control value (a PI control value for limiting charging) for the deviation between the direct-current voltage and the working voltage of the charging limiter and, in response to the direct-current voltage being lower than the working voltage of a discharging limiter, calculates a PI control value (a PI control value for limiting discharging) for the deviation between the direct-current voltage and the working voltage of the discharging limiter. A limiter regulator strengthens limitation of the command value for charging power from the command value limiter in accordance with the PI control value for limiting charging and strengthens limitation of the command value for discharging power from the command value limiter in accordance with the PI control value for limiting discharging.

IPC Classes  ?

• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

A power conversion device is connected to a power transmission line which is connected to a generator. The power conversion device includes a frequency detector that detects a system frequency, the system frequency being a frequency of an AC voltage on the power transmission line, a controller that generates a reactive power command value to compensate for a variation in the detected system frequency, and a power converter that outputs reactive power in accordance with the reactive power command value to the power transmission line.

IPC Classes  ?

• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power

Abstract

An insulation diagnosis device according to an embodiment performs insulation diagnosis for a three-phase alternate-current motor on the basis of a U-phase current, a V-phase current, and a W-phase current supplied to the three-phase alternate-current motor, the insulation diagnosis device comprising: a current vector calculation unit (23, 24) that calculates at least one of a zero-phase current vector or a negative-phase current vector on the basis of the U-phase current, the V-phase current, and the W-phase current; a reference current vector storage unit (25) that pre-stores a reference current vector; a current difference vector calculation unit (26) that calculates a current difference vector, which is the difference between the current vector calculated by the current vector calculation unit (23, 24) and the reference current vector; and a determination unit (28) that determines the insulation state of the three-phase alternate-current motor on the basis of the current difference vector.

IPC Classes  ?

• G01R 31/34 - Testing dynamo-electric machines
• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 31/52 - Testing for short-circuits, leakage current or ground faults

Abstract

The present disclosure provides a system for controlling cutting by a crop shear, the system being capable of suppressing cutting errors in a cut material at a set cutting point to the extent possible even if the speed of the cut material varies. This system for controlling cutting by a crop shear, which cuts a cut material being transported on a hot-rolling line, comprises an image detector that detects an image of the cut material being transported, the image detector being disposed on the input side of the crop shear. A tip end position or tail end position of the cut material and the movement amount of the cut material are established from the image data detected by the image detector, and the drive speed of cutting blades of the crop shear is adjusted on the basis of the established tip end position or tail end position and movement amount of the cut material.

IPC Classes  ?

• B23D 36/00 - Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock while the latter is travelling otherwise than in the direction of the cut

Abstract

An AC/DC converter converts an AC voltage supplied from an AC power supply into a first DC power supply voltage. A power supply line transmits the first DC power supply voltage to a plurality of power conversion modules and a bypass module. The bypass module includes a switch connected between the AC power supply and the load, and a first controller that operates upon receiving an operating power supply voltage based on the first DC power supply voltage to thereby control ON/OFF of the switch. Each power conversion module includes a power converter that converts power supplied from the AC power supply or a power storage device into AC power and supplies the AC power to the load, and a second controller that operates upon receiving an operating power supply voltage based on the first DC power supply voltage to thereby control the power converter.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

In the event of power interruption of a commercial AC power source (6), this uninterruptible power supply device: controls a bidirectional chopper (2) such that a DC voltage (VD) between DC lines (L1, L3) becomes a second reference voltage (VDR 2) higher than a first reference voltage (VDR 1) for a prescribed time (Tc); and then controls the bidirectional chopper (2) such that the DC voltage becomes the first reference voltage. Accordingly, during power interruption, a battery current (IB) can be temporarily increased above usual, and even when a small-sized capacitor (C1 to C4) is used, it is possible to prevent the DC voltage from dropping below a lower limit voltage (VDL).

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

Provided is a control device of a power conversion device, said power conversion device comprising: at least one alternating-current capacitor that is disposed in a capacitor circuit which branches from an alternating-current circuit on an output side of an inverter, and that is disconnected from the circuit during a failure; and an electric current sensor that is disposed in the capacitor circuit, and that acquires an electric current value of an alternating-current electric current of each phase flowing to the alternating-current capacitor. The control device comprises: an amplitude calculation unit that acquires, from the electric current sensor, the electric current value of the alternating-current electric current of each phase flowing to the alternating-current capacitor, and that calculates, on the basis of the acquired electric current value of the alternating-current electric current of each phase, a value of an amplitude of a fundamental wave component of the alternating-current electric current of each phase; and a failure determination unit that compares the sizes of a prescribed determination value and the value of the amplitude of the fundamental wave component of the alternating-current electric current of each phase calculated by the amplitude calculation unit, and that determines that there is a failure of the alternating-current capacitor if the value of the amplitude of at least one phase among the values of the amplitude of the fundamental wave component of the alternating-current electric current of the phases is less than the prescribed determination value.

IPC Classes  ?

• H02M 7/48 - Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

The present invention provides a SCADA web HMI system that can prevent delay in updates of display on screens of HMI client machines and stoppage of a server machine even when a processing load on the server machine is large. A SCADA server machine comprises a communication driver and a client management unit that is connected one-to-one with HMI client machines. The client management unit comprises: a reception thread that receives signal data from the communication driver; first and second signal data buffers that can store the signal data, which is received by the reception thread, in association with a signal data identifier for each data type; and a transmission thread that reads signal data stored in the first or second signal data buffer, and transmits the read signal data to an HMI client machine. While the transmission thread is reading signal data from one of the first and second signal data buffers and transmitting the read signal data to an HMI client machine, signal data stored in the other one of the first and second signal data buffers is overwritten.

IPC Classes  ?

• H04L 67/5651 - Reducing the amount or size of exchanged application data
• H04Q 9/00 - Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A reactive power compensation device includes a power converter and a converter control unit, and compensates reactive power of an AC power grid by output reactive power of the power converter. The converter control unit includes an AC voltage detection unit and an output limit unit. The AC voltage detection unit detects voltage information of the AC power grid to which the power converter is connected. The output limit unit determines whether or not the output reactive power of the power converter needs to be limited, on the basis of the voltage information detected by the AC voltage detection unit, and in a case where the output reactive power needs to be limited, limits the output reactive power of the power converter.

IPC Classes  ?

• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks
• H02M 5/293 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A fan unit is disposed on an upper surface of a housing, and includes a fan, a frame member, and a support member. The frame member is disposed to surround an outer circumference of an opening provided in an upper surface of the housing. The support member supports the fan above the opening while being fixed to the frame member. A gap is provided between a lower end of a first surface of the frame member and the upper surface of the housing. A first blocking member is connected to the first surface of the frame member to be slidable in a vertical direction. In a state in which the gap is exposed, at least one second blocking member is inserted through the gap into the frame member to block the opening in the upper surface of the housing.

IPC Classes  ?

• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
• H02M 7/797 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating