For preventing overcurrent discharge, a protection method, a power supply apparatus, and an electronic device are disclosed. The power supply apparatus may include a power supply module and a protection circuit coupled to the power supply module and an electrical terminal. The protection circuit may include a controller that directs power from the power supply module to the electrical terminal, wherein the controller stops a current flow from the power supply module to the electrical terminal in response to a voltage detected by the controller being higher than a threshold voltage based on a temperature of the protection circuit.