本发明实施例提供一种过电压保护电路，适用于配置在芯片的电源接脚(VCC)与电源端之间。此过电压保护电路包括电压侦测单元、限流组件及开关组件。电压侦测单元耦接于电源端与接地端之间，并用以根据电源端的电压位准输出设置电压。限流组件耦接于电源端与芯片的电源接脚之间。开关组件耦接于芯片的电源接脚与接地端之间，其中开关组件另耦接电压侦测单元以受控于设置电压。当电源端的电压位准高于第一默认值时，开关组件导通以关闭芯片所接收到的电压。

An exemplary embodiment illustrates an over voltage protection circuit for placing between the pin VCC of a driver chip and a power terminal. The over voltage protection circuit includes a voltage detection unit, a current limiting component and a switch component. The voltage detection unit is coupled between the power terminal and a ground, for outputting a setting voltage according to the voltage level at the power terminal. The current limiting component is coupled between the power terminal and the pin VCC of the driver chip. The switch component is coupled between the pin VCC of the driver chip and the ground, wherein the switch component is coupled to the voltage detection unit and controlled by the setting voltage. When the voltage level at the power terminal is higher than a first predetermined value, the switch component conducts to cut off the voltage being received by the driver chip.