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:
Dec. 15, 2009
Filed:
Jul. 02, 2007
Hiroki Toda, Ichinomiya, JP;
Kenichi Fukumoto, Kyoto, JP;
Yosuke Aoyagi, Kyoto, JP;
Hiroyuki Fujita, Kyoto, JP;
Hiroki Toda, Ichinomiya, JP;
Kenichi Fukumoto, Kyoto, JP;
Yosuke Aoyagi, Kyoto, JP;
Hiroyuki Fujita, Kyoto, JP;
Rohm Co., Ltd., Kyoto-shi, Kyoto, JP;
Abstract
First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to thereby subject the semiconductor switches to PWM control. Series circuits consisting of capacitors and semiconductor switches are connected between the center tap of the primary winding and the ends of the same. The semiconductor switches are activated in synchronism with the first and second semiconductor switches, thereby preventing occurrence of an anomalous high voltage, which would otherwise be caused at the time of switching operation.