US 12,483,121 B2
Power supply system and power factor correction control circuit and control method thereof
Wei-Hsu Chang, Hsinchu (TW); Shih-Ho Hsu, New Taipei (TW); Mao-Hui Kuo, New Taipei (TW); and Ta-Yung Yang, Taoyuan (TW)
Assigned to Richtek Technology Corporation, Hsinchu (TW)
Filed by Richtek Technology Corporation, Hsinchu (TW)
Filed on Sep. 7, 2023, as Appl. No. 18/463,244.
Claims priority of application No. 112121089 (TW), filed on Jun. 6, 2023.
Prior Publication US 2024/0413744 A1, Dec. 12, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/4208 (2013.01) [H02M 3/33576 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A power factor correction control circuit, which is configured to operably correct a power factor of a rectified power to generate an output power supplied to a load; the power factor correction control circuit comprising:
a reference voltage generator circuit, which is configured to operably generate reference voltage according to a rectified voltage of the rectified power; and
a feedback modulation circuit, which is configured to operably generate a modulation control signal based upon the reference voltage and a feedback signal related to an output voltage of the output power, so as to control at least one switch of a power stage circuit to switch an inductor in the power stage circuit and to thereby regulate the output voltage;
wherein the reference voltage generator circuit is configured to operably select one of at least two candidate voltages as the reference voltage according to a comparison result between the rectified voltage and at least one determination threshold, such that the output voltage is at least partially positively correlated with the rectified voltage.