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:
Jan. 13, 1998
Filed:
Sep. 12, 1996
Yosuke Shinada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a synchronous rectifying circuit comprising a main transformer, a primary circuit, a secondary circuit, and a control circuit, the secondary circuit includes a synchronous rectifier which comprises not only a second series circuit comprising first and second synchronous rectifying elements but also first and second impedance circuits. The first impedance circuit is inserted between an end of a secondary winding of the main transformer and a first control terminal of the first synchronous rectifying element. The second impedance circuit is inserted between another end of the secondary winding of the main transformer and a second control terminal of the second synchronous rectifying element. Each of the first and the second impedance circuits may consist of a parallel circuit comprising a resistor and a diode. Each of the first and the second impedance circuits may a capacitor. Each of the first and the second impedance circuits may consist of a capacitor and a parallel circuit comprising a resistor and a diode.