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. 16, 2008
Filed:
Nov. 16, 2005
Ta-yung Yang, Milpitas, CA (US);
Rui-hong LU, Shueishang Township, Chiayi County, TW;
Chuh-ching LI, Jhongli, TW;
Feng-cheng Tsao, Linbian Township, Pingtung County, TW;
Tso-min Chen, Taichung, TW;
Ta-Yung Yang, Milpitas, CA (US);
Rui-Hong Lu, Shueishang Township, Chiayi County, TW;
Chuh-Ching Li, Jhongli, TW;
Feng-Cheng Tsao, Linbian Township, Pingtung County, TW;
Tso-Min Chen, Taichung, TW;
System General Corporation, Taipei Hsien, TW;
Abstract
The present invention provides a power converter having a phase lock circuit for quasi-resonant soft switching. The power converter includes a first circuit coupled to the feedback signal to generate a switching signal for switching a switching device and regulating the output of the power converter. A second circuit is coupled to an auxiliary winding of the transformer for generating a voltage signal in response to the voltage of the transformer. A phase lock circuit generates a control signal to enable the switching signal in accordance with the voltage signal. The switching signal further turns on the switching device in response to a valley voltage across the switching device.