Overvoltage protection circuit for shortening restart time after power failure of power supply

The invention provides an overvoltage protection circuit for shortening the restart time after power failure of a power supply, which is suitable for an overvoltage protection circuit of a large capacitive load, when an output overvoltage fault of a secondary power supply occurs, an output voltage value is monitored and compared with a reference voltage, then a slow start enabling end of a control chip is controlled, and the output overvoltage fault of the secondary power supply is reduced. Therefore, the output overvoltage protection function of the power supply is realized, and the damage of output overvoltage to a post-stage load is prevented. And when the power supply is restarted after being shut down, the risk that the power supply cannot be started due to false triggering of the overvoltage protection function of the power supply can be avoided by improving the power-on circuit and designing parameters. According to the control scheme, the circuit design is simple, the risk that the power supply cannot