Power battery charging method, motor control circuit, and vehicle

A power battery charging method for a motor control circuit, wherein the motor control circuit comprises a first switch module, a three-phase inverter, and a control module;

• a power supply module, the first switch module, the three-phase inverter, and a three-phase alternating current motor form a current loop;
• midpoints of three phase legs of the three-phase inverter are respectively connected to three phase coils of the three-phase alternating current motor, and the three-phase alternating current motor is a three-phase four-wire system, the three-phase alternating current motor is configured to input or output a current by using a wire N extending from a connection point of the three phase coils;
• the control module is separately connected to the three-phase inverter, the first switch module, the three-phase alternating current motor, and the power supply module;
• the control module is configured to control the three-phase inverter to enable the motor control circuit to receive a voltage of the power supply module and output a direct current, the charging method comprising:
• obtaining a voltage of the power supply module and a voltage of a power battery, and selecting a charging manner based on the voltage of the power supply module and the voltage of the power battery, wherein the charging manner comprises a boost charging manner and a direct charging manner;
• and
• controlling the first switch module to close so that the power supply module outputs a direct current, and controlling the three-phase inverter so that the power supply module charges the power battery in the selected charging manner.

A vehicle, comprising:

• a motor control circuit, wherein the motor control circuit comprises a first switch module, a three-phase inverter, and a control module;
• a power supply module, the first switch module, the three-phase inverter, and a three-phase alternating current motor form a current loop;
• midpoints of three phase legs of the three-phase inverter are respectively connected to three phase coils of the three-phase alternating current motor, and the three-phase alternating current motor is a three-phase four-wire system, the three-phase alternating current motor is configured to input or output a current by using a wire N extending from a connection point of the three phase coils;
• the control module is separately connected to the three-phase inverter, the first switch module, the three-phase alternating current motor, and the power supply module;
• the control module is configured to control the three-phase inverter to enable the motor control circuit to receive a voltage of the power supply module and output a direct current.