Current zero-crossing detection circuit

The utility model relates to the technical field of detection circuits, and particularly discloses a current zero-crossing detection circuit, which comprises a sampling circuit, a waveform conversioncircuit and a comparison circuit. The sampling circuit is connected with the alternating current signal input end and used for converting the collected current signal into a voltage signal, and the voltage signal is a sine wave signal; the waveform conversion circuit is connected with the output end of the sampling circuit and is used for converting the sine wave signal into a sharp pulse signal;and the comparison circuit is connected with the output end of the waveform conversion circuit and is used for carrying out zero-crossing detection on the sharp pulse signal according to the referencecomparison voltage and outputting a square wave signal. The waveform conversion circuit is arranged so that the sine wave signal can be converted into the sharp pulse signal, and the accuracy of subsequent zero-crossing switch