The energy conversion apparatus provided in the third aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, and implement an alternating current charging function by using the bridge arm circuit and reusing the bridge arm of the three-phase bridge arm converter. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.

With reference to the third aspect, in an implementation of this embodiment of this application, the bridge arm circuit is two capacitors connected in series, two diodes connected in series, or two switching transistors connected in series. This implementation provides a plurality of implementation solutions, so that the solutions provided in embodiments of this application are more comprehensive.

According to a fourth aspect, an embodiment of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; an alternating current port of one bridge arm of the three-phase bridge arm converter is specifically connected to the motor winding through a first switch and connected to one end of a secondary-side winding of the transformer through a second switch; the other end of the secondary-side winding of the transformer is connected to a busbar end of the motor winding through a third switch; and a primary-side winding of the transformer is connected to an alternating current charging port.