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:
Jan. 21, 2020
Filed:
Mar. 08, 2017
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Kohei Onda, Chiyoda-ku, JP;
Yoshihiro Takeshima, Chiyoda-ku, JP;
Hiroyasu Iwabuki, Chiyoda-ku, JP;
Masahiro Iezawa, Chiyoda-ku, JP;
Ryo Shinohara, Chiyoda-ku, JP;
Hideki Sugita, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Abstract
An electric motor drive device includes a smoothing capacitor and an inverter, and further includes an overvoltage protection unit for overvoltage protection for the smoothing capacitor, and a phase short-circuit control unit. The overvoltage protection unit includes: a discharge circuit having a discharge resistor and an IGBT connected in series; and a first determination circuit which determines, with determination delay, that smoothing capacitor voltage exceeds first set voltage, and turns on the IGBT. The phase short-circuit control unit is provided in a control device for drive-controlling the inverter and includes a second determination circuit which determines, with a determination period longer than the determination delay of the first determination circuit, that smoothing capacitor voltage exceeds second set voltage lower than the first set voltage, to perform phase short-circuit control for the inverter.