Intrinsically safe comparator protection circuit

The utility model provides an intrinsically safe comparator protection circuit. The intrinsically safe comparator protection circuit comprises an input power supply VIN and a 5V output end, the circuit further comprises an operational amplifier U2, a silicon controlled rectifier D8 and a voltage stabilizer D5. Two ends of an A pole and a K pole of the silicon controlled rectifier D8 are respectively connected with the input power supply VIN and a ground wire, and a G pole of the silicon controlled rectifier D8 is connected with a pin 4 of the operational amplifier U2; two ends of the voltage stabilizer D5 are respectively connected with a pin 3 and a pin 2 of the operational amplifier U2; the circuit is simple in structure, can effectively protect the front-end voltage conversion module and the rear-end weak current circuit, guarantees the safety of a board card, and avoids accidents. 本实用新型提供了一种本质安全型比较器保护电路，包括输入电源VIN和5V输出端；还包括运算放大器U2、可控硅D8以及稳压器D5；所述可控硅D8的A极和K极两端分别连接所述输入电源VIN和地线，所述可控硅D8的G极与所述运算放大器U2的引脚4相连；所述稳压