Low-frequency signal detection circuit

The utility model belongs to the technical field of detection circuits, and provides a low-frequency signal detection circuit which comprises an MOS processor, a low-frequency current transformer, a rectification circuit and a low-frequency current sampling circuit, one end of the low-frequency current transformer is connected with a signal input end, and the other end of the low-frequency current transformer is connected with the low-frequency current sampling circuit and the rectification circuit. The output end of the low-frequency current sampling circuit is connected with the MOS processor; the detection circuit composed of the MOS processor, the low-frequency current transformer, the rectification circuit, the low-frequency current sampling circuit and the comparison circuit is simple in structure and stable in performance, and can output current data through the current transformer to detect low-frequency signals, thereby effectively evaluating the circuit wind and improving the reliability of the circ