A motor-driven system, comprising: a bidirectional charger, wherein the bidirectional charger comprises: a power factor correction circuit, wherein a first terminal of the power factor correction circuit is configured to electrically connect to a charging port; a first voltage conversion circuit, wherein a first terminal of the first voltage conversion circuit is electrically connected to a second terminal of the power factor correction circuit, the first terminal of the first voltage conversion circuit is configured to input or output a direct current, and a second terminal of the first voltage conversion circuit is configured to input or output an alternating current; a first transformer, wherein a first terminal of the first transformer is electrically connected to the second terminal of the first voltage conversion circuit; and a second voltage conversion circuit, wherein a first terminal of the second voltage conversion circuit is electrically connected to a second terminal of the first transformer, the first terminal of the second voltage conversion circuit is configured to input or output an alternating current, a second terminal of the second voltage conversion circuit is configured to output or input a direct current, and the second terminal of the second voltage conversion circuit is configured to electrically connect to an electricity storage unit; wherein the motor-driven system further comprises: an excitation drive component configured to drive an excitation generator, wherein the excitation drive component is electrically connected to a multiplexing node by using a first switch unit, characterized in that the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit. a bidirectional charger, wherein the bidirectional charger comprises: a power factor correction circuit, wherein a first terminal of the power factor correction circuit is configured to electrically connect to a charging port; a first voltage conversion circuit, wherein a first terminal of the first voltage conversion circuit is electrically connected to a second terminal of the power factor correction circuit, the first terminal of the first voltage conversion circuit is configured to input or output a direct current, and a second terminal of the first voltage conversion circuit is configured to input or output an alternating current; a first transformer, wherein a first terminal of the first transformer is electrically connected to the second terminal of the first voltage conversion circuit; and a second voltage conversion circuit, wherein a first terminal of the second voltage conversion circuit is electrically connected to a second terminal of the first transformer, the first terminal of the second voltage conversion circuit is configured to input or output an alternating current, a second terminal of the second voltage conversion circuit is configured to output or input a direct current, and the second terminal of the second voltage conversion circuit is configured to electrically connect to an electricity storage unit; wherein a power factor correction circuit, wherein a first terminal of the power factor correction circuit is configured to electrically connect to a charging port; a first voltage conversion circuit, wherein a first terminal of the first voltage conversion circuit is electrically connected to a second terminal of the power factor correction circuit, the first terminal of the first voltage conversion circuit is configured to input or output a direct current, and a second terminal of the first voltage conversion circuit is configured to input or output an alternating current; a first transformer, wherein a first terminal of the first transformer is electrically connected to the second terminal of the first voltage conversion circuit; and a second voltage conversion circuit, wherein a first terminal of the second voltage conversion circuit is electrically connected to a second terminal of the first transformer, the first terminal of the second voltage conversion circuit is configured to input or output an alternating current, a second terminal of the second voltage conversion circuit is configured to output or input a direct current, and the second terminal of the second voltage conversion circuit is configured to electrically connect to an electricity storage unit; wherein the motor-driven system further comprises: an excitation drive component configured to drive an excitation generator, wherein the excitation drive component is electrically connected to a multiplexing node by using a first switch unit, characterized in that the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit. an excitation drive component configured to drive an excitation generator, wherein the excitation drive component is electrically connected to a multiplexing node by using a first switch unit, characterized in that the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit.