Overvoltage protection circuit, power factor correction power supply and electrical appliance

Abstract

The embodiment of the present application relates to an overvoltage protection circuit, a power factor correction power supply and an electrical appliance, the circuit comprising: a comparator, a voltage acquisition module, a reference voltage generation module and a controlled switch; the input end of the voltage acquisition module is connected with the voltage output end of the protected power supply, and the output end of the voltage acquisition module is connected with the positive input end of the comparator to transmit the output voltage of the protected power supply to the positive input end; the negative input end of the comparator is connected with the reference voltage output end of the reference voltage generation module; the output end of the comparator is connected with the control end of the controlled switch to control the on-off state between the two signal transmission ends of the controlled switch, and the two signal transmission ends of the controlled switch are arranged on the control signal transmission line of the protected power supply. The embodiment of the present application realizes that the protected power supply is immediately turned off in the case that the output voltage of the protected power supply is too large, thereby improving the effectiveness and stability of the power supply protection.

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