ALTERNATING CURRENT RESISTANCE DETECTION CIRCUIT AND SYSTEM

The present invention provides an alternating current resistance detection circuit and system. The alternating current resistance detection circuit comprises: a working state control module, generating a working state control signal to achieve sequential and alternate switching between a detection state and a waiting state; a sampling module, outputting a sampling signal of resistance between a zero line and a live line in the detection state; a comparison module, receiving a reference signal and the sampling signal, and outputting a comparison result; a counting signal generation module, receiving an oscillation signal and the working state control signal, and outputting the oscillation signal as a counting signal in the detection state; a zero clearing module, receiving the comparison result and the working state control signal, and outputting an effective zero clearing signal when the resistance between the zero line and the live wire is greater than a threshold value; and a counting module, connected to t