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:
May. 01, 2007
Filed:
Nov. 02, 2005
Da-jing Hsu, Sijhih, TW;
Yun-kang Zhu, Sijhih, TW;
Da-Jing Hsu, Sijhih, TW;
Yun-Kang Zhu, Sijhih, TW;
Niko Semiconductor Co., Ltd., , TW;
Abstract
A synchronous rectifier control circuit improves energy conversion efficiency and uses a signal produced by a secondary winding of a transformer in a rectifier circuit to control a low-impedance and a low power consuming current switch such as a JFET and a MOSFET in a synchronous rectifier circuit to substitute a high power consuming diode rectification and appropriately rectify and extend the ON time of the current switch to prevent the positive and negative phases of the current switch to be turned on simultaneously, which will cause a large current to burn the current switch. The invention includes a protection circuit having an under voltage lock out circuit for an interrupt output function, so that if an insufficient instant power voltage occurs, the power is turned on or off to interrupt all outputs and force the current switch of the rectifier circuit to turn off, and prevent the output of an unstable working voltage of the rectifier control circuit or the abnormal operation of the current switch.