公开(公告)号：US20230216421A1

公开(公告)日：2023-07-06

申请号：US18089598

申请日：2022-12-28

申请人： Ark Semiconductor Corp. Ltd.

发明人： Yi-Lun Shen ,  Yu-Yun Huang

IPC分类号： H02M3/335 ,  H02M1/00

CPC分类号： H02M3/33592 ,  H02M1/0009 ,  H02M3/33515

摘要： A synchronized rectification control method for use in a flyback converter is provided. The flyback converter includes a transformer including a secondary winding, a synchronous rectifier switch and a synchronous rectifier controller. The synchronous rectifier switch is coupled to the secondary winding and the synchronous rectifier controller, and is used to output a voltage difference signal and receive a control voltage. The method includes the synchronous rectifier controller detecting a rapid falling edge of the voltage difference signal to generate a rapid falling edge signal, generating an envelope signal according to the voltage difference signal, generating a time length control signal according to the voltage difference signal and the envelope signal, generating a blanking time signal according to the voltage difference signal and the time length control signal, and performing a logic operation on the blanking time signal and the rapid falling edge signal to generate the control voltage.

公开(公告)号：US11532992B2

公开(公告)日：2022-12-20

申请号：US17206946

申请日：2021-03-19

申请人： ARK SEMICONDUCTOR CORP. LTD.

发明人： Yi-Lun Shen ,  Yu-Yun Huang ,  Fong-Cheng Yang

IPC分类号： H02M3/335

摘要： A synchronous rectifier controller for controlling a rectifier switch is disclosed. The synchronous rectifier controller includes a fully-ON controller and a regulator. Capable of being triggered by a channel voltage of the rectifier switch, the fully-ON controller turns the rectifier switch fully ON for a fully-ON time in view of a predetermined condition. The regulator, disabled during the fully-ON time and enabled after the fully-ON time, turns the rectifier switch ON to regulate the channel voltage within a predetermined voltage range.