US 12,489,364 B2
Control device of power factor correction circuit, power factor correction circuit and power supply device
Yoshinori Sato, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Dec. 1, 2023, as Appl. No. 18/526,274.
Claims priority of application No. 2022-194024 (JP), filed on Dec. 5, 2022.
Prior Publication US 2024/0186891 A1, Jun. 6, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 7/21 (2006.01)
CPC H02M 1/4258 (2013.01) [H02M 7/21 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A control device, for a power factor correction circuit disposed in a power supply device configured to generate a DC output voltage from an AC voltage applied to a pair of power supply terminals,
the power factor correction circuit,
disposed between a full-wave rectifier circuit configured to generate a full-wave rectified voltage by full-wave rectifying an alternating current voltage and an output wiring configured to apply the output voltage, and
including:
an inductor inserted between the full-wave rectifier circuit and the output wiring; and
a switching element configured to switch between an on state and an off state to control a current flowing through the inductor,
the control device is configured to, during a period when the switching element is turned off, control a number of bottoms in a free vibration of a voltage between a first end and a second end of the switching element based on a period from a turn-on of the switching element to a start of the free vibration.