CPC H02M 7/062 (2013.01) [B60L 53/22 (2019.02); H01H 9/56 (2013.01); H02M 7/04 (2013.01)] | 19 Claims |
1. A switching device provided with a plurality of power conversion circuits respectively corresponding to phases of a multiple-phase power supply as an external power supply, the switching device comprising:
a switching circuit that includes a switching relay capable of switching a connection destination of a first power conversion circuit, different from a second power conversion circuit of the plurality of power conversion circuits, between a first phase corresponding to the first power conversion circuit and a second phase of the external power supply, the second power conversion circuit corresponding to the second phase of the external power supply; and
a controller that controls an operation of the switching relay at a zero-crossing time of an AC voltage estimated based on the AC voltage,
wherein the controller calculates, based on the AC voltage, a detection delay time from a zero-crossing of the AC voltage to detection of a zero-crossing point of the AC voltage by the controller, corrects a zero-crossing point detection time at which the controller has detected the zero-crossing point of the AC voltage using the detection delay time, and controls the operation of the switching relay at a corrected zero-crossing point detection time.
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