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. 02, 2003
Filed:
Aug. 23, 2002
Seiki Igarashi, Tokyo, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
A switching power supply circuit reduces the capacity of the capacitor on the load side, reducing its size, weight, and cost. The switching power supply circuit has a pair of diodes connected in series, a pair of MOSFETs connected in series, a pair of capacitors connected in series, a snubber capacitor connected in parallel with the pair of diodes, the pair of MOSFETS, and the pair of capacitors. The circuit can include a pair of additional capacitors, connected respectively in parallel with the MOSFETS, to allow the MOSFETs to execute a zero-voltage switching. The circuit also includes an AC input terminal connected to the mutual connection point of the pair of diodes, a transformer including a primary winding having one end connected to the mutual connection point of the pair of MOSFETS, and the other end connected to the mutual connection point of the pair of capacitors. The primary winding has a center tap connected to another AC input terminal.