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:
Aug. 08, 2006
Filed:
Jan. 16, 2004
Mikihiro Yamashita, Echi-gun, JP;
Yoshinori Katsura, Hikone, JP;
Seiichi Iwao, Hikone, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
The present invention is to provide a switching power supply device for preventing the change of characteristic of the line filter due to filler such as resin which covers the circuits. A switching power supply device is disclosed which comprise a rectifierfor full wave rectification of the input of the utility power supply, a condenserfor smoothing the output of the rectifier, a line filterconsisting of a first coilwhich is connected in series to a high voltage side output of the rectifierand a second coilwhich is connected in series to a low voltage side output of the rectifiervia the condenser, a condenserfor smoothing the output of the line filter, a series circuit of a primary windingof a transformerwhich is connected in parallel to the condenserand a switching element, a diodefor half-wave rectification of the output of a secondary windingof the transformer, and a condenserconnected between output terminals of the secondary windingvia the diode, wherein a diodeis connected in a forward direction from an input of the second coilof the line filterto an output of the first coilof the line filter