Control circuit of external control variable displacement compressor on air conditioner controller in automobile

The utility model discloses a control circuit of an external control variable-displacement compressor on an air conditioner controller in an automobile. The control circuit comprises a variable-displacement compressor electromagnetic valve control regulating circuit and a variable-displacement compressor electromagnetic valve current feedback acquisition circuit, the variable-displacement compressor electromagnetic valve control and adjustment circuit outputs 400 Hz PWM control signals with the adjustable duty ratio to a compressor electromagnetic valve through high-side driving, and the effective current of the compressor electromagnetic valve is adjusted by adjusting the duty ratio of the PWM control signals. The variable displacement compressor solenoid valve current feedback acquisition circuit converts a current signal into a voltage signal through a sampling resistor and then amplifies the voltage signal through an amplification circuit. The amplified signal converts a PWM signalinto a direct current si