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:
Nov. 08, 2011
Filed:
Sep. 26, 2008
Ying-chieh Su, Sijhih, TW;
Chih-chi Chang, Taoyuan, TW;
Ying-Chieh Su, Sijhih, TW;
Chih-Chi Chang, Taoyuan, TW;
System General Corp., Taipei Hsien, TW;
Abstract
A switching control circuit is coupled to a switching device and an auxiliary winding of a transformer, wherein a primary winding of the transformer is coupled to the switching device. The switching control circuit includes a voltage receiver, a comparing unit and a propagation delay circuit, wherein the voltage receiver is coupled to the auxiliary winding of the transformer for receiving a reflected voltage signal and transforming the reflected voltage signal into a peak voltage signal, while the switching device is turned off. The comparing unit is coupled to the voltage receiver for receiving the peak voltage signal and a first threshold voltage, and outputting a comparison result. The propagation delay circuit is coupled to the comparing unit for receiving the comparison result, and outputting a PWM signal to turn on the switching device after a delay time.