Zero cross detection circuit and silicon controlled rectifier voltage stabilizing device

The utility model discloses a zero-crossing detection circuit and a silicon controlled rectifier voltage stabilizing device, which are applied to the technical field of power electronics and are used for solving the problem of poor reliability of zero-crossing detection in the prior art. The circuit specifically comprises at least one silicon controlled rectifier, at least one voltage detection module, at least one rectification module, at least one isolation module and a zero-crossing output module. The voltage detection module is used for detecting and reducing voltage at two ends of the connected silicon controlled rectifier; the rectifier module is used for converting the voltage into direct-current voltage; the isolation module is used for connecting the third end and the fourth end of the isolation module when the input DC voltage reaches a preset voltage; and the zero-crossing output module is used for outputting a level signal corresponding to a voltage zero-crossing point when the third ends and the