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:
Apr. 14, 2015
Filed:
Oct. 06, 2011
Shiori Uota, Tokyo, JP;
Takahiro Inoue, Tokyo, JP;
Koji Tamaki, Fukuoka, JP;
Shoichi Orita, Tokyo, JP;
Shiori Uota, Tokyo, JP;
Takahiro Inoue, Tokyo, JP;
Koji Tamaki, Fukuoka, JP;
Shoichi Orita, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A power module includes a current sensing circuit in which a transistor includes an emitter connected to a sense emitter of a current sense element of an IGBT and a base connected to ground, a current sensing resistor including one end thereof connected to a collector of the transistor and the other end thereof connected to a common connection portion. The power module detects, as a current sensing voltage, a potential difference generated by the current sensing resistor based on the common connection portion as a reference, compares the current sensing voltage with a predetermined threshold voltage, and determines whether or not an overcurrent flows through the IGBT according to a magnitude relation therebetween.