Over-voltage and under-voltage surge protection circuit

The invention discloses an overvoltage and undervoltage surge protection circuit, which comprises an overvoltage protection circuit, an ideal diode circuit and an undervoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of the ideal diode circuit and the input end of the under-voltage protection circuit, and the output end of the ideal diode circuit and the output end of the under-voltage protection circuit are both connected with direct current output. The overvoltage and undervoltage surge protection circuit not only can solve the harm caused by input overvoltage, but also can solve the consequence caused by input undervoltage, in addition, the circuit structure is simple, the cost is low, the response speed is high, the overvoltage and undervoltage surge requirements specified by various standards at present are met, and a guarantee is provided for overcurrent and short circuit of electronic equipment. 本发明公开了一种过欠压浪涌保护电路，包括过压保护电路、理想二极管电路以及欠压保护电路，其