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:
Aug. 24, 1999
Filed:
Apr. 07, 1998
Tsutomu Ogawa, Shizuoka, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
In a switching power supply apparatus including an output transformer having a primary winding, a secondary winding and a feedback winding, a DC power source supplying DC voltage to the primary winding of the output transformer, an oscillation switching element having one terminal connected to the primary winding of the output transformer and a control terminal connected to the feedback winding, and a rectifying and smoothing circuit connected to the secondary winding of the output transformer, the switching power supply apparatus is characterized by further comprising a control circuit for flowing current through the secondary winding of the output transformer to one direction and a direction opposite thereto during a predetermined period after a time point where voltage is generated in the secondary winding of the output transformer.