The application provides a power supply redundancy protection circuit, which comprises a power supply state detection unit, a power supply switch
control unit, a power supply redundancy protection unit, a first
power supply unit and a second
power supply unit; the input end of the power supply state detection unit is connected with a first power supply
signal and a second power supply
signal, and is used for outputting a power supply state detection
signal based on the first power supply signal and the second power supply signal; the power supply switch
control unit is connected with the power supply state detection unit, and is used for outputting a power supply switch
control signal; the power supply redundancy protection unit is connected with the power supply switch
control unit, and is used for selecting the first
power supply unit or the second power supply unit for power supply. The application realizes the power supply redundancy protection function by using fewer components; supports power supply hot plug, realizes
high availability and continuity of the power supply
system, supports power supply
overvoltage protection and under-
voltage protection, guarantees the stability and reliability of
system operation, and has simple implementation scheme and low cost.