Patent ID: 8172580

Claim:
A power adapter comprising: a main body; a first coupling portion, disposed to the main body, having electrode contacts with predetermined numbers/formats; a second coupling portion, disposed to the main body to electrically connect the first coupling portion, having a permanent magnet; a magnetic attraction portion, disposed to an end of the main body relatively having the first coupling portion; a voltage step-down circuit disposed inside the main body and electrically connected to the first coupling portion and the second coupling portion; and a detection circuit disposed inside the main body, the detection circuit electrically connected to first coupling portion, the second coupling portion and the voltage step-down circuit, an output voltage of the voltage-step down circuit being automatically regulated upon a detection result of the detection circuit, wherein several slot holes are axially arranged to the main body, and the electrode contact of the second coupling portion has an electrode spindle and an electrode bushing stretching out the main body, and several movable conduction sleeves are sequentially laminated over the electrode bushing to relatively shift between movable conduction sleeves and to retain a junction effect through mutual contacting, and the movable conduction sleeve at an extreme inner layer rubs against the electrode bushing, and several push buttons pierce through the slot hole of the main body, and each push button is connected to the movable conduction sleeve to form a linking effect together with the movable conduction sleeve.