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:
Aug. 17, 1999
Filed:
Aug. 10, 1998
Shunichi Kondoh, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Electric Engineering Co., Ltd., Tokyo, JP;
Abstract
A circuit for driving a three-phase brushless DC motor (301) includes a neutral point feedback circuit (201) which operates a three-phase output circuit (202) so that a neutral point potential (V.sub.C) of the motor (301) is maintained at a predetermined potential, and a neutral point potential comparison circuit (500) which determines whether or not the neutral point potential (V.sub.C) is between reference potentials (V.sub.ref1, V.sub.ref2). If the neutral point potential (V.sub.C) is not between the reference potentials (V.sub.ref1, V.sub.ref2), a switch shutoff signal (SC) is activated to turn off a switch (106), so that a current (I.sub.C) is not provided to the neutral point feedback circuit (201). Accordingly, the neutral point feedback circuit (201) stops flowing currents (I.sub.A, I.sub.B) to the three-phase output circuit (202) which in turn stops driving the motor (301). The circuit for driving the motor (301) is prevented from being broken down if a short circuit occurs in the motor (301).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile