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:
Jun. 17, 2014
Filed:
Mar. 04, 2010
Satoshi Azuma, Tokyo, JP;
Takuya Sakai, Tokyo, JP;
Satoshi Azuma, Tokyo, JP;
Takuya Sakai, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Three-phase windings-and-of a first common-mode transformerand a second common-mode transformerare connected in series through connecting lines-, respectively. The windings-are connected to an unillustrated AC power supply by connecting lines-. The windings-are connected to a three-phase motor by connecting lines-and through a converter and an inverter which are unillustrated. A windingfor common-mode voltage detection detects high-frequency leakage currents flowing through the connecting lines-as a common-mode voltage V, and an output voltage Vobtained by voltage amplification by a voltage amplifieris applied to a windingfor common-mode voltage application in such a manner that the output voltage Vworks in generally the same direction as the common-mode voltage V, thereby canceling out the high-frequency leakage currents through the windings-. Since a voltage amplification method is used, it is possible to reduce the high-frequency leakage currents with a simpler configuration as compared to a conventional current amplification method.