Alternating current reverse connection and grounding validity detection circuit

The utility model provides an AC reverse connection and grounding validity detection circuit in the technical field of AC charging pile detection equipment. The AC reverse connection and grounding validity detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a diode D1 and a diode D2. One end of the resistor R2 is connected with the resistor R1, and the other end of the resistor R2 is connected with the resistor R3; one end of the resistor R5 is connected with the resistor R4, and the other end of the resistor R5 is connected with the resistor R6; the input end of the diode D1 is connected with the resistor R3 and the resistor R4, and the output end of the diode D1 is connected with the resistor R7; the input end of the diode D2 is grounded, and the output end of the diode D2 is connected with the resistor R7, the resistor R8 and the resistor R9; and the resistor R8 is grounded. The alternating curren