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:
Sep. 30, 2025
Filed:
Sep. 23, 2023
Richtek Technology Corporation, Zhubei, TW;
Shin-Li Lin, Hsinchu, TW;
He-Yi Shu, Nantou, TW;
Shih-Jen Yang, New Taipei, TW;
Ta-Yung Yang, Taoyuan, TW;
Yi-Min Shiu, Hsinchu, TW;
Chih-Ching Lee, Hsinchu, TW;
Yu-Chieh Hsieh, Taipei, TW;
Chao-Chi Chen, New Taipei, TW;
RICHTEK TECHNOLOGY CORPORATION, Zhubei, TW;
Abstract
A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.