The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2026
Filed:
Sep. 29, 2023
Joulwatt Technology Co., Ltd., Hangzhou, CN;
Xianghua Jiang, Hangzhou, CN;
Junming Zhang, Hangzhou, CN;
Pitleong Wong, Hangzhou, CN;
Xiangyong Xu, Hangzhou, CN;
JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD, Hangzhou, CN;
Abstract
Disclosed is a protection circuit of a flyback converter and a control method. The protection circuit comprises: an active discharge module, for providing a discharge path between a first current terminal and a second current terminal of a switch transistor in a resonance circuit, and controlling turning-on and turning-off of the discharge path according to a discharge enable signal; in the normal work state of the flyback converter, the discharge path is disconnected, the resonance circuit works, before the flyback converter is restarted, the discharge path is turned on for a predetermined time period to release charges stored in the resonance circuit, and the resonance current after the flyback converter is restarted is reduced to the safe work current of the second switch transistor. The resonance current is discharged before the flyback converter is restarted, thus reducing the resonance current and enhancing system stability and security.