Abstract

An LED driver includes a power input configured to receive an input power; a dimmer switch input configured to receive a brightness input; and a power supply coupled to the power input and the dimmer switch input, the power supply having a plurality of selectable transfer functions and a currently selected transfer function of the plurality of selectable transfer functions, the power supply being configured to generate an output power from the input power, the output power having a level based on a value of the brightness input and the currently selected transfer function.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• F21K 9/00 - Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• H05B 37/00 - Circuit arrangements for electric light sources in general
• H05B 37/02 - Controlling

Abstract

An active preload circuit includes: a rectifier configured to receive an AC input from a TRIAC dimmer and to generate DC power; a preload; and a phase angle controller configured to selectively couple the preload to the DC power.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• H05B 35/00 - Electric light sources using a combination of different types of light generation

Abstract

A touch sensor for controlling intensity of lighting electrically connected thereto, the touch sensor including a touch sensor interface for detecting a touch of a user, a power supply connected to the touch sensor for controlling the intensity of the lighting, and a backlight behind the touch sensor interface, and including a plurality of light sources for illuminating different portions of the touch sensor interface.

IPC Classes  ?

• G06F 3/041 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• G08B 5/36 - Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electromagnetic transmission using visible light sources
• H05B 37/00 - Circuit arrangements for electric light sources in general

Abstract

A method of monitoring a power factor correcting (PFC) power supply is provided. The method includes: powering on the PFC power supply with a constant current; starting a runtime counter that increments a count value; measuring an output voltage; calculating an output power by multiplying the constant current by the output voltage; storing the output power in a random-access memory (RAM); calculating an input power by multiplying the output power by an efficiency curve factor; and storing the input power in the RAM.

IPC Classes  ?

• 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

A dual stage power converter capable of being installing in a one-gang box and powering an LED load is presented. The dual stage converter can include a power factor correction (PFC) stage operating in transition mode and a resonant converter stage operating at a fixed frequency with a fixed duty cycle and dead time. A dimmer input may be included to select a desired luminosity of the LED load. A main controller adjusts the value of the voltage output from the PFC stage in order to maintain the voltage output from the resonant stage at the desired level.

IPC Classes  ?

• H05B 37/02 - Controlling
• H03K 5/07 - Shaping pulses by decreasing duration by the use of resonant circuits
• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources