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:
Feb. 01, 2022
Filed:
Mar. 18, 2020
Huayuan Semiconductor (Shenzhen) Limited Company, Shenzhen, CN;
Wanfeng Zhang, Palo Alto, CA (US);
Richard M. Myers, Grass Valley, CA (US);
Liang Yan, Fremont, CA (US);
Junjie Zheng, Cupertino, CA (US);
Huayuan Semiconductor (Shenzhen) Limited Company, Shenzhen, CN;
Abstract
An active clamp switching power converter circuit includes a sensing circuit that generates a sensed auxiliary winding voltage of an auxiliary winding around the core having a same polarity as the secondary winding. A controller controls switching of a power switch coupled to the primary winding to control current through the primary winding and controls switching of an active clamp switch based on the sensed voltage to control leakage energy when the power switch is turned off. The controller regulates timing of the switching to achieve a zero voltage switching condition prior to turning on the power switch for power efficient operation.