Differential detection circuit for AC voltage

Abstract

The utility model discloses a differential detection circuit for alternating voltage, which comprises a blocking capacitor A, a blocking capacitor B, a current-limiting resistor A, a current-limiting resistor B, an operational amplifier A, an operational amplifier B, a resistor R1, a resistor R7, a resistor R8 and an RC filter resistor. According to the utility model, the differential circuit is designed, the effect of accurately detecting 220VAC overvoltage and undervoltage can be achieved, compared with the traditional mutual inductor scheme, the volume is smaller, and the circuit is built by conventional electronic elements, so that the circuit structure is simple, the detection precision is high, and the cost is low.

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