Bus voltage detection circuit in coal mining machine

The utility model discloses a voltage detection circuit for a bus in a coal mining machine, and relates to the technical field of voltage detection circuits. The detection circuit comprises an AC voltage acquisition unit, a rectification circuit unit, a voltage-controlled power supply type second-order active filter unit and an RC filter unit. The input end of the alternating-current voltage acquisition unit is electrically connected with a mains supply, and the output end of the alternating-current voltage acquisition unit is electrically connected with the input end of the rectifying circuit unit; the output end of the rectifying circuit unit is electrically connected with the input end of the voltage-controlled power supply type second-order active power filter unit; the output end of the voltage-controlled power supply type second-order active filter unit is electrically connected with the input end of the RC filter unit; the output end of the RC filter unit is the signal output end of the detection circu