When the energy conversion apparatus shown in FIG. 5 runs in a motor drive mode, the switch K1 is connected to a lower contact, the switch K2 is disconnected, and the switch K3 is disconnected. In this case, electric energy that is output from the battery 501 is output to the motor winding 503 through the three-phase bridge arm converter 502, to drive a motor.

In this embodiment of this application, when a left winding and a middle winding of the motor winding 503 are in the alternating current charging mode, a function of an energy storage inductor (which may also be referred to as a power factor correction (PFC) inductor) can be implemented. In the motor drive mode, a winding of the motor winding 503 is used as a winding for driving a motor according to a conventional solution. Therefore, in this embodiment of this application, not only the bridge arm of the three-phase bridge arm converter 502 is reused, but also the winding of the motor winding 503 is reused. This further increases an integration level and reduces a volume of the energy conversion apparatus.