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:
Nov. 04, 2014
Filed:
Jan. 10, 2013
Kosuke Nakano, Chiyoda-ku, JP;
Tetsuya Kojima, Chiyoda-ku, JP;
Satoshi Azuma, Chiyoda-ku, JP;
Isao Kezobo, Chiyoda-ku, JP;
Ryuichi Takiguchi, Chiyoda-ku, JP;
Kosuke Nakano, Chiyoda-ku, JP;
Tetsuya Kojima, Chiyoda-ku, JP;
Satoshi Azuma, Chiyoda-ku, JP;
Isao Kezobo, Chiyoda-ku, JP;
Ryuichi Takiguchi, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An electric motor driving apparatus having a failure detection circuit includes: a bridge circuit driving an electric motor; a PWM control circuit generating voltage instruction for driving the electric motor; a PWM signal generation circuit generating a PWM signal; a DC current detection circuit detecting DC current of the bridge circuit; a phase current calculation circuit calculating output phase current of the bridge circuit, based on the DC current and PWM signal; and a failure detection circuit detecting failure of the DC current detection circuit. The failure detection circuit determines failure of the DC current detection circuit from the DC current detected values in a zero voltage period in which the high-potential-side arms of the bridge circuit are all ON and in a zero voltage period in which the low-potential-side arms are all ON.