US 12,483,120 B2
Power supply system with power factor correction(PFC) and control method thereof
Wei-Hsu Chang, Hsinchu (TW); Kun-Yu Lin, Hsinchu (TW); and Jyun-Che Ho, Chiayi (TW)
Assigned to RICHTEK TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Richtek Technology Corporation, Zhubei (TW)
Filed on Jan. 10, 2024, as Appl. No. 18/409,078.
Claims priority of application No. 112140605 (TW), filed on Oct. 24, 2023.
Prior Publication US 2025/0132664 A1, Apr. 24, 2025
Int. Cl. H02M 1/42 (2007.01); H02M 1/00 (2006.01); H02M 3/335 (2006.01)
CPC H02M 1/4208 (2013.01) [H02M 1/0009 (2021.05); H02M 3/33571 (2021.05)] 21 Claims
OG exemplary drawing
 
1. A power supply system with power factor correction (PFC), comprising:
an AC rectifier, which is configured to operably rectify an AC input power to generate a rectified power;
a power factor correction (PFC) conversion circuit, which is configured to operably perform a PFC conversion on the rectified power to generate a converted power, and determine whether to disable the PFC conversion according to a disable signal;
an asymmetric half-bridge (AHB) flyback converter, which is configured to operably perform a DC-DC conversion on the converted power to generate an adapter output power; and
a communication protocol power delivery (PD) interface, which is configured to operably determine the adapter output power according to a first communication protocol information, and control a power path switch to deliver the adapter output power to a power supply pin;
wherein when an electrical power of the adapter output power is lower than a power threshold, and a converted voltage of the converted power is higher than a first voltage threshold, the communication protocol PD interface generates the disable signal to disable the PFC conversion of the PFC conversion circuit.