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:
May. 09, 2017
Filed:
May. 28, 2015
Applicant:
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Inventors:
Tadahiro Imada, Kawasaki, JP;
Tatsuya Hirose, Yokohama, JP;
Assignee:
FUJITSU LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/156 (2006.01); H02M 1/08 (2006.01); H02M 1/34 (2007.01);
U.S. Cl.
CPC ...
H02M 1/08 (2013.01); H02M 1/34 (2013.01); H02M 3/156 (2013.01); H02M 2001/342 (2013.01); H03K 2217/0036 (2013.01); Y02B 70/1425 (2013.01); Y02B 70/1491 (2013.01); Y02P 80/112 (2015.11);
Abstract
A power supply circuit includes a switching element and a control section. The control section converts back electromotive force generated at the time of the operation of the switching element to optical energy and converts the optical energy to an electrical signal. Furthermore, the control section drives the switching element on the basis of the electrical signal obtained by converting the optical energy. Accordingly, unlike a case where surge energy is regenerated by resonance, there is no need to use a resonant element such as an inductor. As a result, circuit scale is reduced.