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. 26, 2011
Filed:
Aug. 27, 2008
Tomofumi Yamashita, Saga, JP;
Hiroyuki Shinohara, Saga, JP;
Shoji Totsuka, Kanagawa, JP;
Nobuyuki Shigeyama, Saga, JP;
Katsuaki Murata, Kumamoto, JP;
Tomofumi Yamashita, Saga, JP;
Hiroyuki Shinohara, Saga, JP;
Shoji Totsuka, Kanagawa, JP;
Nobuyuki Shigeyama, Saga, JP;
Katsuaki Murata, Kumamoto, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed power supply device includes a voltage resonance circuit configured to include an output coil for boosting an input direct-current voltage to a predetermined voltage and outputting the boosted voltage to a load and also include a capacitor connected to the output coil; and a switching unit configured to be turned ON/OFF so as to control electric current supply to the output coil. An auxiliary resonance circuit is connected in parallel with the output coil so as to reduce switching losses without using a power control circuit for switching control.