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:
Jan. 19, 2021
Filed:
Feb. 20, 2019
Applicant:
Fairchild Semiconductor Corporation, Phoenix, AZ (US);
Inventors:
Zhibo Tao, Palto Alto, CA (US);
Jung-Sheng Chen, Kaohsiung, TW;
Li Lin, Zubei, TW;
Kai-Fang Wei, Milpitas, CA (US);
Chih-Hsien Hsieh, Dacun Township, TW;
Hangseok Choi, Yongin-si, KR;
Yue-Hong Tang, Caotun Township, TW;
Assignee:
FAIRCHILD SEMICONDUCTOR CORPORATION, Phoenix, AZ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M 3/335 (2006.01); H02M 1/00 (2006.01);
U.S. Cl.
CPC ...
H02M 3/33523 (2013.01); H02M 3/335 (2013.01); H02M 2001/0054 (2013.01); Y02B 70/10 (2013.01); Y02P 80/10 (2015.11);
Abstract
A switched-mode power supply with near valley switching includes a quasi-resonant converter. The converter includes a switch element that is turned on not only at the valley, but also in a window range of Δtclose to the valley, where the voltage across the switch element is at its minimum. This advantageously reduces switching loss and maintains a balance between efficiency and frequency variation.