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. 12, 2014
Filed:
Aug. 22, 2007
Ryo Yokozutsumi, Tokyo, JP;
Ryo Yokozutsumi, Tokyo, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
In a controller for an AC electric train capable of power running and regenerative running, and capable of detecting a power failure in an AC overhead wire for supplying AC electric power, a power failure in the AC overhead wire is swiftly and reliably detected. A power failure detector provided in an electric-train control unit includes a specific-frequency-signal calculating unit that extracts a current component corresponding to a specific-frequency set value from a main-transformer output-current detection signal and outputs an extracted signal as a specific-frequency current signal, a subtracter that subtracts the main-transformer output-current detection signal from the specific-frequency current signal and outputs a result of the subtraction as a current deviation, and a power-failure detecting unit that compares the current deviation with a predetermined power-failure-detection set value, and outputs a power-failure detection signal when the current deviation is greater than the power-failure-detection set value.