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:
Mar. 18, 2014
Filed:
May. 11, 2012
Applicants:
Naohiro Sogo, Fukuoka, JP;
Shingo Tomioka, Fukuoka, JP;
Shinichi Sunaoku, Fukuoka, JP;
Inventors:
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A power module includes: a drive circuit for driving an IGBT of a semiconductor element; a protection circuit for performing operation for protection of the IGBT if the collector current of the IGBT has reached a trip level; and a control power source voltage detection circuit for detecting a control power source voltage to be supplied to the drive circuit. The protection circuit changes a sense resistor from a resistor to a series circuit with resistors and if the control power source voltage drops to a level lower than a predetermined value, thereby lowering the trip level.