US 12,261,541 B2
Systems and methods for synchronous rectification of power supply systems
Yaming Cao, Shanghai (CN); Wuping Lin, Shanghai (CN); Chunsheng Zhao, Shanghai (CN); and Lieyi Fang, Shanghai (CN)
Assigned to On-Bright Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD., Shanghai (CN)
Filed on Jul. 24, 2023, as Appl. No. 18/225,512.
Application 18/225,512 is a continuation of application No. 17/333,844, filed on May 28, 2021, granted, now 11,757,366.
Claims priority of application No. 202010471872.1 (CN), filed on May 29, 2020.
Prior Publication US 2024/0063724 A1, Feb. 22, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/33592 (2013.01) [H02M 1/0012 (2021.05); H02M 1/08 (2013.01)] 35 Claims
OG exemplary drawing
 
1. A system for synchronous rectification of a power converter, the power converter including a primary winding and a secondary winding, the system comprising:
a first system terminal configured to receive an input voltage; and
a second system terminal configured to output a drive signal to a transistor coupled to the secondary winding;
wherein the system is configured to:
determine whether the input voltage becomes lower than a predetermined voltage threshold; and
if the input voltage becomes lower than the predetermined voltage threshold, determine whether a time when the input voltage becomes lower than the predetermined voltage threshold is during or not during any demagnetization process of the secondary winding.