CONTROL CIRCUIT FOR POWER CONVERSION DEVICE

Registre Brevet WIPO
Numéro d'application JP2019031654
Numéro de publication 2021/028972
Statut Délivré - en vigueur
Date de dépôt 2019-08-09
Date de publication 2021-02-18
Propriétaire OMRON CORPORATION (Japon)
Inventeur(s)
  • Ishibashi, Hiroki
  • Onishi, Hiroyuki

Abrégé

Provided is a control circuit for a power conversion device such as, for example, a power factor improving circuit including an inductor. The control circuit is provided with: a first detection circuit for detecting the current flowing through the inductor and amplifying the voltage corresponding to the detected current with a predetermined gain, followed by outputting the result as a detection voltage; a comparator for comparing the detection voltage with a predetermined reference voltage and outputting a comparison result signal; a second detection circuit for detecting an input voltage to a power conversion device; and a third detection circuit for detecting the output voltage of the power conversion device. The control circuit calculates, on the basis of the detected input voltage, the detected output voltage V, a preset delay time, the inductance value of the inductor, a conversion factor used when converting the current detected by the first detection circuit to voltage, a power supply voltage, and the gain, the reference voltage for making a delay when detecting the zero value of the current flowing through the inductor substantially zero and outputs the reference voltage to the comparator.

Classes IPC  ?

  • 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 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