CHARGE AND DISCHARGE CONTROL METHOD AND CIRCUIT AND INTEGRATED CHARGING AND DISCHARGING GUN

A charge and discharge control method is performed by a processor in a charge and discharge control circuit including a first interface module, a second interface module, and the processor. The charge and discharge control method includes: in response to the first interface module being electrically connected to the power supply, controlling the vehicle to enter a charging mode; where controlling the vehicle to enter the charging mode includes detecting whether a first pulse-width modulation (PWM) signal exists at a signal terminal of the first interface module; in response to the first PWM signal at the signal terminal of the first interface module, controlling the vehicle to enter a charging pile charging mode; and in response to no first PWM signal at the signal terminal of the first interface module, controlling the vehicle to enter a power grid charging mode.