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. 07, 2012
Filed:
Jun. 16, 2010
Junming Zhang, Hangzhou, CN;
Yuanchang Ren, Hangzhou, CN;
Jin HU, Hangzhou, CN;
Huanyu LU, Beijing, CN;
Yang Shi, Hangzhou, CN;
Junming Zhang, Hangzhou, CN;
Yuanchang Ren, Hangzhou, CN;
Jin Hu, Hangzhou, CN;
Huanyu Lu, Beijing, CN;
Yang Shi, Hangzhou, CN;
Monolithic Power Systems, Inc., San Jose, CA (US);
Abstract
A frequency limitation method used in quasi-resonant control of a switching regulator is disclosed. The switching frequency is limited through setting a minimum time limit, such as a minimum switching period or a minimum OFF time. The minimum time limit may be a first time limit or a second time limit. The minimum time limit is changed into another value if the minimum voltage point approaches the minimum time limit point, so as to eliminate the audible noise.