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:
Dec. 25, 2018
Filed:
Jul. 13, 2017
Applicant:
Chengdu Monolithic Power Systems Co., Ltd., Chengdu, CN;
Inventor:
Lei Li, Chengdu, CN;
Assignee:
Chengdu Monolithic Power Systems Co., Ltd., Chengdu, CN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M 1/08 (2006.01); H02M 1/44 (2007.01); H02M 3/158 (2006.01); H02M 3/156 (2006.01); H02M 1/00 (2006.01);
U.S. Cl.
CPC ...
H02M 1/083 (2013.01); H02M 1/44 (2013.01); H02M 3/156 (2013.01); H02M 3/1588 (2013.01); H02M 2001/0038 (2013.01);
Abstract
Noise-free control circuit and control method for controlling a switching converter to avoid generating audile noises. The noise-free control circuit has a timer used to set a noise-free frequency threshed. When the switching frequency of the switching converter is decreased to the noise-free frequency threshold, the switching frequency of the switching converter is limited to the noise-free frequency threshold. The noise-free frequency threshold is higher than a maximum audible frequency of an audio noise.