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. 30, 2003
Filed:
Mar. 13, 2002
Applicant:
Inventor:
Eiji Takegami, Nagaoka, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/335 ;
U.S. Cl.
CPC ...
H02M 3/335 ;
Abstract
A series circuit of a primary winding A of a transformer and a switching element is coupled to a DC source and a voltage induced in a secondary winding B of the transformer according to switching operation of the switching element is rectified and smoothed by a rectifier smoothing circuit Further, a Zener diode is coupled across the switching element with reverse polarity to the switching element . The Zener diode may be coupled across a rectifier diode which conducts during the ON period of the switching element