Patent ID: 7755221

Claim:
An electronic device comprising: a power module having an anode and a cathode; an audio module having a first audio signal terminal, a second audio signal terminal and a ground terminal; an audio socket having a first audio signal terminal, a second audio signal terminal connected to the second audio signal terminal of the audio module, and a ground terminal; a first relay-switch; a second relay-switch; and a power adapter comprising: an adapter module having an anode and a cathode; and an audio plug arranged to plug into the audio socket, the audio plug having an audio signal terminal and a ground terminal connected to the anode and the cathode of the adapter module respectively, wherein the first audio terminal of the audio socket is selectively connected to the anode of the power module and the first audio signal terminal of the audio module via the first relay-switch, the ground terminal of the audio socket is selectively connected to the cathode of the power module and the ground terminal of the audio module via the second relay-switch, and the first audio terminal and the ground terminal of the audio socket are connected to the anode and cathode of the power module when the audio plug is plugged into the audio socket.