Circuit for extracting square wave signal corresponding to high-amplitude sine wave

The invention relates to a circuit for extracting a square wave signal corresponding to a high-amplitude sine wave. A pin BS, a pin BAL and a pin VCC of a comparator are connected with an anode of a first power supply and a ground capacitor C4; a pin VCC of the comparator is connected with a cathode of the first power supply and a ground capacitor C3; a pin IN of the comparator is connected with a signal input end; a pin IN of the comparator is connected with a ground capacitor C2 in series; a pin E0 of the comparator is connected with a ground end of the comparator C2; the pin IN of the comparator is connected with a resistor R7; one end of the resistor R7 is connected with the ground end of the capacitor C2; the pin IN of the comparator is connected with a diode D3 and a resistor R6; the anode of the diode D3 is connected with the pin IN; the cathode of the diode D3 is connected with the resistor R6; the other end of the resistor R6 is connected with common ends of the capacitor C2 and