Voltage zero crossing point detection method and device, detection circuit and storage medium

The invention discloses a voltage zero crossing point detection method and device, a detection circuit and a storage medium. The method comprises the following steps: acquiring a voltage sampling value, wherein the voltage sampling value is a voltage value obtained by performing rectification operation and sampling operation on a target voltage; obtaining a first specified threshold value, wherein the first specified threshold value is determined based on a second specified threshold value corresponding to the last determined zero crossing point moment; and determining a zero crossing point moment of the target voltage based on a comparison result of the voltage sampling value and a first specified threshold value. The control module receives the voltage sampling value after sampling operation, namely the digital signal, so that the signal interference problem of a square wave signal can be avoided, and the accuracy of zero crossing point detection is improved. Besides, the first specified threshold value in