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. 04, 2008
Filed:
Jan. 18, 2006
Yukinari Fukumoto, Niiza, JP;
Yukinari Fukumoto, Niiza, JP;
Sanken Electric Co., Ltd., Saitama, JP;
Abstract
A switching power source device of resonance type is provided which comprises an output voltage detectorfor detecting output voltage on a loadto produce a detection signal; and a control circuitfor applying on-off signals V, Vto each control terminal of first and second MOS-FETsin response to the detection signal from the output voltage detectorControl circuitcomprises a frequency control circuitfor controlling the on-off operation of first and second MOS-FETsin response to the level of detection signal from output voltage detectorto decide the switching frequency of first and second MOS-FETsFrequency control circuitis provided with an on-time control circuitwhich more reduces the on-span of one of first and second MOS-FETsduring the light load period in response to the level of detection signal from output voltage detectorthan during the non-light load period to control power consumption, reduce switching loss and noise, and improve switching efficiency in electronics.