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:
Jul. 03, 2007
Filed:
Nov. 28, 2003
Yukinari Fukumoto, Niiza, JP;
Syohei Osaka, Niiza, JP;
Toshirou Takeuchi, Niiza, JP;
Sanken Electric Co., Ltd., Saitama, JP;
Abstract
A DC power source device comprises a MOS-FETwhich performs the intermittent switching operation for converting DC input from a DC power supplyinto high frequency electric power; a control circuitfor turning MOS-FETon and off; and a rectifying smootherfor converting the high frequency electric power through MOS-FETinto a DC power output supplied to a loadControl circuit 9 comprises an output current controllerfor controlling the on-off term of MOS-FETto make DC output current Ithrough loadsettle toward a rated value I; a shunt regulatorfor receiving a drive current Isupplied from rectifying smootherand producing a reference voltage Vto regulate the rated value Iof output current controllerand a constant current sourcefor keeping drive current Ion a substantially constant level under the rated output current value condition and reduced output voltage condition. Constant current sourcefunctions to supply shunt regulatorwith minimum drive current Ito maintain reference voltage Von a constant level under the reduced output voltage, and also to control drive current Ito shunt regulatorto a necessary but minimum level under the rated value of DC output current.