SWITCHING DEVICE, SWITCHING POWER SUPPLY APPARATUS, AND VEHICLE

A prevention switching device is provided. The apparatus includes a switching circuit and a controller. The switching circuit includes a switching relay capable of switching a connection destination of a first power conversion circuit other than a second power conversion circuit among the plurality of power conversion circuits between a phase corresponding to the first power conversion circuit and a certain phase of the external power supply. The second power conversion circuit corresponds to the certain phase of the external power supply. The controller controls an operation of the switching relay at a zero-crossing time of an AC voltage estimated based on the AC voltage.