In general terms, embodiments of the present invention relate to an overvoltage protection circuit. In some embodiments, the overvoltage protection circuit includes: (a) an input receiving node configured to receive an input voltage; (b) an input transmitting node; (c) an input switch formed between the input receiving node and the input transmitting node, and configured to selectively electrically connect the input receiving node to the input transmitting node based on a switch control signal, where the input switch is configured to cut off an electrical connection between the input receiving node and the input transmitting node when the switch control signal is in an inactive state (e.g., a logic low state “L”); and (d) a control signal generation block configured to sense a transmission voltage of the input transmitting node and generate the switch control signal in the inactive state when the transmission voltage rises to a reference voltage or higher.