Overvoltage protection circuit and charging device

An overvoltage protection circuit applied to a charger, comprising:

• an input voltage sampling circuit, an input end of the input voltage sampling circuit being configured to be connected in parallel to an input end of a power factor correction power supply of the charger, and the input end of the power factor correction power supply being further configured to be connected to a power supply for converting a voltage of the power supply to a charging voltage for charging a battery to be charged,
• an amplifier circuit, an input end of the amplifier circuit being connected to an output end of the input voltage sampling circuit,
• a charging management circuit, a sampling end of the charging management circuit being connected to an output end of the amplifier circuit, and the charging management circuit being configured to control the power factor correction power supply to operate when it is detected that a voltage output by the amplifier circuit is smaller than or equal to a preset voltage threshold, and
• a logic device power supply, connected to the input voltage sampling circuit, the amplifier circuit, and the charging management circuit respectively, and configured to supply an operating voltage to the input voltage sampling circuit, the amplifier circuit, and the charging management circuit.