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. 24, 2018
Filed:
Sep. 03, 2014
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Hiroki Katsumata, Hino, JP;
Masakazu Gekinozu, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A motor drive device includes a bridge circuithaving a plurality of legs with switch elementsin upper and lower arms. High frequency AC voltage output from the bridge circuit, when it is connected to an AC power supply, is converted into a DC voltage via a transformerand an AC/DC conversion circuit, thus charging the battery. Also, the DC voltage of the batteryis converted into an AC voltage by the bridge circuitwhen the AC power supplyis cut off from the bridge circuit, and supplied to the alternating current motor. Because of this, the isolating transformercan be driven at high frequency while the motor driving power conversion circuit is also used for battery charging, and a reduction in size and reduction in cost of the overall device are achieved.