Energy conversion system, energy conversion method, and power system

A power system comprising:

• a bridge arm conversion module comprising a first bridge arm switch and a plurality of second bridge arm switches connected in parallel, wherein a bridge arm midpoint of the first bridge arm switch is configured to connect one of a live wire or a neutral wire of an alternating current charging interface;
• a motor comprising three phase of winding, wherein the three phase of winding are respectively connected to each midpoints of the plurality of second bridge arm switches and a common connection end of the three phases of windings are configured to connect the other one of a live wire or a neutral wire of an alternating current charging interface;
• a bus capacitor connected parallel with the first bridge arm switch and the plurality of second bridge arm switches;
• a direct current to direct current (DC/DC) conversion module configured to convert a bus voltage of the bus capacitor to charge a traction battery or convert the traction battery voltage to form the bus voltage;
• wherein the bridge arm conversion module is configured to convert an alternating current input voltage supplied by the alternating current charging interface to form the bus voltage of the bus capacitor or drive the motor based on the bus voltage of the bus capacitor.