Protection circuit, electrical equipment and electrical system

Abstract

The application discloses a protection circuit, a power consumption device and a power consumption system. The protection circuit is applied to the power consumption device, the power consumption device is connected with a controlled power supply, and the protection circuit comprises a sampling circuit, a control circuit and a driving circuit. The sampling circuit is connected with the controlled power supply, an input end of the sampling circuit receives an input voltage from the controlled power supply, and the sampling circuit is used for sampling the input voltage to obtain a sampling signal. The input end of the control circuit is connected with an output end of the sampling circuit, the control circuit is used for outputting a first control signal when the sampling signal is greater than or equal to a preset reference voltage. The input end of the driving circuit is connected with an output end of the control circuit, the output end of the driving circuit is connected with the controlled power supply, and the driving circuit is used for controlling the controlled power supply to stop working based on the first control signal. The above scheme can realize protection of the port when the input voltage is greater than the preset reference voltage, and overvoltage damage is prevented.

Images