Patent ID: 8054661

Claim:
An AC adapter, comprising: an AC-side plug module, comprising: a first voltage-reducing element electrically coupled to an AC power supply; a relay electrically coupled to the AC power supply; and an AC-to-DC converter electrically coupled to the relay; a DC-side connector module coupled with the AC-side plug module, wherein the DC-side connector module has a mechanical switch element which is electrically coupled to the relay and the first voltage-reducing element; wherein when the DC-side connector module is connected to a device socket, the mechanical switch element is turned on and the relay is enabled, so that the electrical power of the AC power supply is transmitted to the AC-to-DC converter through the enabled relay, and the AC-to-DC converter correspondingly generates a DC voltage; wherein when the DC-side connector module is not connected to the device socket, the mechanical switch element is turned off and the relay is disabled, so that the electrical power of the AC power supply is not transmitted to the AC-to-DC converter.