Bidirectional DC/DC converter, control method thereof, and vehicle

A bidirectional DC/DC converter control method, comprising:

• in a first time period in which the bidirectional DC/DC converter is in a second working state, controlling a second terminal circuit to transmit a second alternating current to a first terminal circuit through a second winding and a first winding, and controlling the first terminal circuit to convert the second alternating current into a second direct current, wherein the bidirectional DC/DC converter comprises the first terminal circuit, a transformer, the second terminal circuit, and a reset circuit, the transformer comprises the first winding and the second winding, the first terminal circuit is coupled to the first winding, and the second terminal circuit and the reset circuit are coupled to the second winding;
• in a second time period in which the bidirectional DC/DC converter is in the second working state, controlling the second terminal circuit to stop transmitting the second alternating current to the first terminal circuit, and controlling the reset circuit to be conducted, so as to reset the second winding;
• and
• when the bidirectional DC/DC converter is in a first working state, controlling the first terminal circuit to transmit a first alternating current to the second terminal circuit through the first winding and the second winding, controlling the second terminal circuit to convert the first alternating current into a first direct current, and controlling the reset circuit to be broken.

A vehicle power supply system, wherein the vehicle power supply system comprises:

• a bus capacitor;
• a motor controller;
• a contactor;
• and
• a bidirectional DC/DC converter, wherein the bidirectional DC/DC converter comprises a first terminal circuit, a transformer comprising a first winding and a second winding, a second terminal circuit, and a reset circuit, wherein the first terminal circuit is coupled to the first winding, and the second terminal circuit and the reset circuit are coupled to the second winding;
• Wherein the motor controller and the bus capacitor are coupled to two ends of the first terminal circuit of the bidirectional DC/DC converter in parallel, and the motor controller is configured to control rotation of a motor, to supply power to a vehicle;
• the motor controller and the bus capacitor are coupled to a power battery through the contactor;
• two ends of the second terminal circuit of the bidirectional DC/DC converter are coupled to a storage battery in parallel, and the bidirectional DC/DC converter is configured to pre-charge the bus capacitor with the storage battery when the bidirectional DC/DC converter is in a second working state;
• and
• the contactor is configured to be turned on when a difference between a voltage between two ends of the bus capacitor and a voltage between two ends of the power battery is less than a preset threshold, to enable the bidirectional DC/DC converter to enter a first working state, and the power battery is configured to supply power to the storage battery or another device in the vehicle through the bidirectional DC/DC converter when the bidirectional DC/DC converter is in the first working state.