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. 26, 2014
Filed:
Aug. 10, 2012
Daijiro Araki, Mito, JP;
Motomi Shimada, Mito, JP;
Yoshihiro Miyaji, Hitachinaka, JP;
Keita Suzuki, Hitachinaka, JP;
Keishi Suzuki, Tokyo, JP;
Daijiro Araki, Mito, JP;
Motomi Shimada, Mito, JP;
Yoshihiro Miyaji, Hitachinaka, JP;
Keita Suzuki, Hitachinaka, JP;
Keishi Suzuki, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a drive device for a railway vehicle, in which regeneration braking force is increased by adding the output voltage of a voltage adjustment device to a DC power source voltage, operation of the current control device is started prior to the start of the power running operation or the regeneration operation of the inverter device, and the operation of the current control device is stopped later than the stopping of the power running operation or the regeneration operation of the inverter device. Thereby, the current control device is surely operated at least during the operation period of the inverter device, so that the output voltage of the voltage adjustment device is adjusted by the current control device, to thereby prevent the over-discharge of the energy storage device at the time of power running operation or the overcharge of the energy storage device at the time of regeneration operation.