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. 31, 2016
Filed:
Mar. 04, 2015
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Takahiro Mori, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A drive circuit includes a constant current circuit which supplies a constant current to the gate of an IGBT and on-operates the IGBT; a discharge circuit which grounds the gate of the IGBT and off-operates the IGBT; and a switch circuit which operates one of the constant current circuit or discharge circuit in accordance with a control signal and turns on or off the IGBT. In particular, the drive circuit includes a current detection circuit which detects a current flowing through the IGBT when the IGBT is turned on; and a current regulation circuit which feeds the current detected by the current detection circuit back to the constant current circuit and controls an output current of the constant current circuit in accordance with the turn-on characteristics of the IGBT.