Patent ID: 8924051
Filing Date: 2014-12-30
Classification: B60L,Y02T

Abstract:
1. A drive device for a railway vehicle, comprising: a current collector device acquiring a direct-current power from a direct-current voltage source; an inverter device that converts the direct-current power to an alternating-current power; one or more alternating-current motors driven by the inverter device; and a power storage device connecting to a direct-current power side of the inverter device, the driving device for a railway vehicle controlling the power storage device based on voltage values obtained from at least two of a first voltage sensor detecting a voltage of the direct-current voltage source, a second voltage sensor detecting a voltage of the power storage device and a third voltage sensor detecting a voltage on the direct-current side of the inverter device, wherein drive device for a railway vehicle further comprises a chopper circuit comprising a first switching element capable of conducting or blocking a current in a direction from the direct-current voltage source to a grounding point of the direct-current voltage source and a second diode element capable of conducting a current only in the opposite direction to the first switching element, the first switching element and the second diode element being connected in series with each other, a positive terminal of the power storage device is connected to a point of connection of the first switching element and the second diode element and to the grounding point of the direct-current voltage source, a negative terminal of the power storage device is connected to a negative side of the inverter device, and thereby the power storage device is connected to the inverter device in such a manner that the power storage device is capable of being connected in series with the inverter device, and a switching operation of the first switching element occurs in a state where the power storage device is connected in series with the inverter device.