Patent ID: 8472157

Claim:
An overvoltage and overcurrent protection circuit, comprising: a connection jack for connecting to a power supply to receive power from the power supply; an overvoltage protection switch connected to the connection jack; an overcurrent protection switch connected to the overvoltage protection switch in serials, and further configured to be connected to a load; a voltage reference module to output a reference voltage; an overvoltage and overcurrent detection module connected between the overcurrent protection switch and ground, and to detect the voltage of the load and the current of the path including the load in real time; a comparing module connected to the voltage reference module, the overvoltage and overcurrent detection module, and the overvoltage protection switch, and to compare the voltage of the load detected by the overvoltage and overcurrent detection module with the reference voltage output by the voltage reference module, the comparing module further to turn off the overvoltage protection switch when the voltage of the load is greater than the reference voltage, and turn on the overvoltage protection switch when the voltage of the load is not greater than the reference voltage; and a current control module connected to the overvoltage and overcurrent detection module and the overcurrent protection switch, to turn off the overcurrent protection switch when the current of the path is greater than a preset value, and turn on the overcurrent protection switch when the current of the path is not greater than the preset value.