Patent ID: 11938986
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 16:
17. A control device for a railway vehicle to, in a power conversion system in which a power converter converts electric power supplied from a current collector to a primary side of the power converter into alternating-current (AC) power and supplies the AC power to a motor connected to a secondary side of the power converter, determine whether the current collector is separate from a power line, the control device comprising:
a threshold calculator to calculate, using a physical quantity that is positively correlated with an output power from the power converter and varies with time in response to a time variation in the output power, a threshold having an absolute value positively correlated with the physical quantity and varying with time in response to a time variation in the physical quantity;
a separation determiner to compare a current flowing from the current collector to the power converter with the threshold and determine whether the current collector is separate from the power line; and
a torque controller to control switching elements of the power converter to control the output power from the power converter based on whether the current collector is separate from the power line.