Input overvoltage protection circuit, circuit board assembly and electronic equipment

The embodiment of the utility model relates to the technical field of circuits, and discloses an input overvoltage protection circuit, a circuit board assembly and electronic equipment. According to the utility model, the sampling unit outputs the voltage to the comparison unit according to the acquired voltage between the live wire and the zero wire in the electronic equipment, and when the voltage between the live wire and the zero wire is larger, the voltage output to the comparison unit is larger. When the comparison unit judges that the voltage between the live wire and the zero wire is higher than a preset threshold value according to the voltage output by the sampling unit, the comparison unit outputs an enable signal to the control unit, and the control unit controls the switch to be switched off, namely, controls the power supply loop of the electronic equipment to be switched off, so that the electronic equipment is protected from being damaged due to overlarge power supply voltage. 本实用新型实施例涉及电路技术领域