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. 13, 2003
Filed:
Apr. 09, 2002
Guichao Hua, Edison, NJ (US);
Yi Jiang, Hangzhou, CN;
Bel-Fuse, Inc., Jersey City, NJ (US);
Abstract
A self-driven synchronous rectification circuit which includes two power switches S and S ; a transformer Tr having a primary winding N , a secondary winding N and an auxiliary winding N ; two secondary synchronous rectifiers S and S ; two diodes D and D ; two switching transistors Q and Q ; and two zener diodes ZD and ZD . The number of auxiliary winding turns N of the transformer Tr ensure that the synchronous rectifiers S and S are supplied with an adequate gate-drive voltage. When S conducts, the gate-drive voltage of S is clamped by D and Q . Likewise, when S conducts, the gate-drive voltage of S is clamped by D and Q . ZD and ZD operate to restrain the gate over voltage of S and S , respectively. When the gate drive voltage of S is clamped by D and Q , Q disables D and when the gate drive voltage of S is clamped by D and Q , Q disables D .