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:
Sep. 17, 2013
Filed:
Dec. 24, 2009
Shunzou Ohshima, Kosai, JP;
Teruki Yamauchi, Kosai, JP;
Shunzou Ohshima, Kosai, JP;
Teruki Yamauchi, Kosai, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
To provide a power supply device which can reduce energy loss caused due to the forward-direction voltage of a flywheel diode. In a load circuit for subjecting an electronic switch Tprovided between a DC power supply VB and a motor Mto the PWM control to thereby drive the motor M, a MOSFET (T) is provided in parallel to the motor M. A parasitic diode Dp of the MOSFET (T) is provided in a manner that its forward direction is in opposite to the flowing direction of a load current ID. The MOSFET (T) is turned on during a part of a period during which the electronic switch Tis placed in an off state to thereby flow a circulation current flowing through the motor Minto the MOSFET (T). Thus, the energy loss can be remarkably reduced as compared with the case of using the flywheel diode.