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:
Feb. 13, 2018
Filed:
Jun. 14, 2017
Applicant:
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Inventors:
Motoyoshi Kubouchi, Matsumoto, JP;
Yasushi Abe, Hino, JP;
Assignee:
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/569 (2006.01); G05F 1/571 (2006.01); H01F 6/00 (2006.01); H02H 7/122 (2006.01); H02M 1/32 (2007.01); H02M 3/158 (2006.01); H02M 1/14 (2006.01); H02M 7/537 (2006.01); H02P 27/06 (2006.01);
U.S. Cl.
CPC ...
H02M 1/32 (2013.01); H02M 1/14 (2013.01); H02M 3/158 (2013.01); H02M 7/537 (2013.01); H02M 2001/325 (2013.01); H02P 27/06 (2013.01);
Abstract
A three-level chopper apparatus includes a protection switch circuit that changes a current pathway through which an overvoltage is applied to a second capacitor or a first capacitor to a current pathway through which no overvoltage is applied to the second capacitor or the first capacitor when a first switch or a second switch has a failure.