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:
Jul. 09, 2013
Filed:
Dec. 08, 2010
Chao-chih Lin, Guanyin Township, Taoyuan County, TW;
Ying-chieh Su, Sijhih, TW;
Jhih-da Hsu, Sindian, TW;
Chia-yo Yeh, Changhua, TW;
Wei-ting Wang, Qiaotou Township, Kaohsiung County, TW;
Chao-Chih Lin, Guanyin Township, Taoyuan County, TW;
Ying-Chieh Su, Sijhih, TW;
Jhih-Da Hsu, Sindian, TW;
Chia-Yo Yeh, Changhua, TW;
Wei-Ting Wang, Qiaotou Township, Kaohsiung County, TW;
System General Corporation, Sindian, Taipei County, TW;
Abstract
A switching control circuit for a switching power converter is provided. The switching control circuit is coupled to a switching device and an auxiliary winding of a transformer. The switching control circuit includes a valley detecting circuit, a valley lock circuit, and a PWM circuit. The valley detecting circuit is coupled to receive a reflected voltage signal from the auxiliary winding of the transformer for outputting a control signal in response to the reflected voltage signal. The valley lock circuit is coupled to receive the control signal for outputting a judging signal in response to the control signal during a first period and a second period following the first period. The PWM circuit outputs a switching signal in response to the judging signal.