Patent ID: 8493755

Claim:
A power supply device comprising: a low-power regulating circuitry operable to receive an electric power signal and output a regulated electric power signal up to a first power limit; a high-power regulating circuitry operable to receive an electric power signal and output the regulated electric power signal up to a second power limit, wherein the second power limit is higher than the first power limit; a first switch disposed between the low-power regulating circuitry and the output of the power supply device, operable to switch between at least an open position and a closed position; a second switch disposed between the high-power regulating circuitry and the output of the power supply device, operable to switch between at least an open position and a closed position; control circuitry powered by the low-power regulating circuitry and operable to selectively enable the low-power and the high-power regulating circuitry when the power supply device is coupled with an electronic device, wherein the selectively enabling is independent from the position of the first and the second switches, wherein the selectively enabling is independent from a power level of the electric power signal.