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. 31, 2007
Filed:
Jun. 01, 2004
Shinji Aso, Niiza, JP;
Shinji Aso, Niiza, JP;
Sanken Electric Co., Ltd., , JP;
Abstract
Provided is a direct-current converter which can reduce power consumption at light load by reducing switching losses of a main switch. The direct-current converter is provided with: a first serial circuit which is connected to both ends of a direct current power supply Vdcand in which a primary winding P of a transformer T and a main switch Qare serially connected to each other; a second serial circuit which is connected both ends of the primary winding P of the transformer T and in which an auxiliary switch Qand a snubber capacitor Care serially connected to each other; rectifying/smoothing circuits D, D, Land Cwhich rectify and smooth a voltage generated in a secondary winding S of the transformer T by energy supplied from the primary winding P of the transformer T when the main switch Qis turned on; and a control circuitwhich turns on/off the main switch Qand the auxiliary switch Qalternately using a signal with predetermined switching frequency. The control circuitreduces the switching frequency during light load.