In some embodiments, a switch 108 is disposed between the primary-side winding of the transformer 105 and the alternating current charging port 106 to implement connection or disconnection between the energy conversion apparatus and the alternating current charging port 106. As shown in FIG. 1, the switch 108 may be disposed between one end of the primary-side winding of the transformer 105 and one port of the alternating current charging port 106. It may be understood that both the alternating current filter 107 and the switch 108 may be disposed between the primary-side winding of the transformer 105 and the alternating current charging port 106.

6. Alternating Current Charging Port 106

In this embodiment of this application, the alternating current charging port 106 is configured to connect to a power grid or connect to an alternating current charging pile. For example, after the alternating current charging port 106 is connected to the alternating current charging pile, electric energy in the alternating current charging pile may be input to the energy conversion apparatus through the alternating current charging port 106, to charge the battery 101.

It may be understood that the alternating current charging port 106 may be in a shape of a standard charging port, or may be in a form of a fast charging port. In addition, a protocol supported by the alternating current charging port 106 may be a standard charging protocol or a fast charging protocol of electric vehicles. In this embodiment of this application, a shape, a size, a supported protocol, and the like of the alternating current charging port 106 are not limited.