In this embodiment of this application, the alternating current filter 107 may be disposed between the alternating current charging port 106 and the transformer 105. The alternating current filter 107 is similar to another alternating current filter device. Details are not described herein.

In this embodiment of this application, the switch 108 may be disposed between the alternating current charging port 106 and the transformer 105, to control connection and disconnection between the alternating current charging port 106 and the transformer 105.

In this embodiment of this application, both the alternating current filter 107 and the switch 108 may be disposed. This is not limited in this embodiment of this application.

FIG. 3a is a schematic diagram of another energy conversion apparatus according to an embodiment of this application. The energy conversion apparatus includes a battery 301, a three-phase bridge arm converter 302, a motor winding 303, a transformer 304, and an alternating current charging port 305. A direct current port of the three-phase bridge arm converter 302 is connected to the battery 301, an alternating current port of the three-phase bridge arm converter 302 is connected to the motor winding 303, a primary-side winding of the transformer 304 is connected to the alternating current charging port 305, and a secondary-side winding of the transformer 304 is connected to two bridge arms of the three-phase bridge arm converter 302. The following describes components of the energy conversion apparatus in detail.