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:
Oct. 05, 2021
Filed:
Jun. 01, 2020
Richtek Technology Corporation, Zhubei, TW;
Wei-Hsu Chang, Hsinchu, TW;
Ta-Yung Yang, Taoyuan, TW;
Yu-Chang Chen, Nantou, TW;
Chao-Chi Chen, New Taipei, TW;
Chuh-Ching Li, Hsinchu, TW;
Li-Di Lo, Taichung, TW;
Hao-Wen Chung, Hsinchu, TW;
RICHTEK TECHNOLOGY CORPORATION, Zhubei, TW;
Abstract
A flyback power converter includes a primary side controller circuit for controlling a primary side switch; and a secondary side controller circuit for generating an SR (Synchronous Rectification) signal to control an SR switch. The SR signal includes an SR pulse and a ZVS (Zero Voltage Switching) pulse. The SR pulse controls the SR switch for synchronous rectification at the secondary side. The secondary side controller circuit samples and holds a voltage at a first end of the SR switch as a first voltage at a timing between the end of the ZVS pulse and the beginning of the SR pulse, and determines a length of the ZVS pulse so as to control the SR switch to be conductive for a ZVS time period, whereby the primary side switch achieves ZVS. The first voltage is proportional to an input voltage.