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:
Sep. 06, 2011
Filed:
Jan. 13, 2009
Yukihiro Nishikawa, Hino, JP;
Yukihiro Nishikawa, Hino, JP;
Fuji Electric Device Technology Co., Ltd., Tokyo, JP;
Abstract
A switching power supply exhibits high conversion efficiency and facilitates reducing the size thereof. The switching power supply includes a half-bridge circuit including a first series circuit formed of switching devices Qand Qand connected between the output terminals of a DC power supply; and a second series circuit connecting primary inductance Lrof transformer T, primary inductance Lrof transformer Tand capacitor Cr in series. The second series circuit is connected between the output terminals of the half-bridge circuit, and is made to conduct a series resonance operation. The switching devices Qand Qis controlled at the ON-duties of 0.5 for reducing the breakdown voltages of rectifying diodes Dand Don the secondary side of transformers Tand Tand for improving the conversion efficiency of the switching device.