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:
Jan. 13, 2015
Filed:
Sep. 20, 2012
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Tetsuya Kawashima, Matsumoto, JP;
Fuji Electric Co., Ltd., Kawasaki-Shi, JP;
Abstract
A current flowing into one of half-bridge circuits of a power semiconductor module is detected by corresponding ones of current detection circuits through a current detection terminal provided in corresponding ones of semiconductor switching devices forming the half-bridge circuits and a current detection terminal provided in corresponding ones of flywheel diodes back-to-back connected to the corresponding ones of the semiconductor switching devices. A pulse voltage waveform indicating the current detected by the corresponding ones of the current detection circuits is held for a predetermined period and converted into a stepwise voltage waveform by use of corresponding ones of sample-and-hold circuits, so that the voltage held by the corresponding ones of the sample-and-hold circuits is transmitted to a control circuit through corresponding ones of insulating circuits.