US 11,938,986 B2
Control device for railway vehicles and disconnection determination method
Michio Otsubo, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/054,584
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 4, 2018, PCT No. PCT/JP2018/025408
§ 371(c)(1), (2) Date Nov. 11, 2020,
PCT Pub. No. WO2020/008575, PCT Pub. Date Jan. 9, 2020.
Prior Publication US 2021/0086804 A1, Mar. 25, 2021
Int. Cl. B60T 8/17 (2006.01); B60L 9/18 (2006.01); B61L 3/00 (2006.01)
CPC B61L 3/008 (2013.01) [B60L 9/18 (2013.01); B60L 2200/26 (2013.01); B60L 2240/423 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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 and supplies the converted 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 changing rate calculator to obtain a voltage at the primary side of the power converter and calculate a changing rate of the voltage at the primary side;
a first 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 first 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 the changing rate with the first 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.