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:
Mar. 12, 2013
Filed:
Aug. 24, 2010
Hiroshi Usui, Niiza, JP;
Hiroshi Usui, Niiza, JP;
Sanken Electric Co., Ltd., Saitama, JP;
Abstract
The resonant switching power supply device is equipped with switching elements QH and QL connected in series to an input direct-current power source Vin, a transformer Thaving secondary windings Sand Sand a primary winding P, a resonant circuit where the primary winding Pand a current resonant capacitor Cri are connected in series and which is connected in parallel to any one of the switching elements, and a rectifying circuit (D+D+Co) connected to the secondary winding to obtain an output voltage Vo; the transformer Tis equipped with a primary winding Pclosely coupled to the primary winding P, one terminal of the primary winding Pis connected to one or the other terminal of the primary winding P. By the other terminal is an open circuit at any time, it suppresses the switching frequency raised at the time of light load.