Patent ID: 6516418
Filing Date: 2003-02-04
Classification: G06F,Y02D

Abstract:
A portable computer system, comprising:a universal serial bus (USB) port that is selectively supplied power from any one of an alternating current (AC) adapter and a battery; detection means for detecting whether the alternating current (AC) adapter is connected to the portable computer system to supply power and generating a detection signal indicating a detected result as to whether the alternating current (AC) adapter is connected to the portable computer system to supply power; storing means for storing one of enabled state and a disabled state as a state of the universal serial bus (USB) port; over-current detection means for any one of generating an over-current detection signal and shutting down power supplied to the universal serial bus (USB) port when detecting an over-current from any one of the alternating current (AC) adapter and the battery; control means for generating a first control signal in response to the detection signal and the state of the universal serial bus (USB) port and generating a second control signal in response to the over-current detection signal, so as to selectively supply power and shut down power supplied to the universal serial bus (USB) port; and switching means for selectively supplying power and shutting down the power supplied to the universal serial bus (USB) port in response to any one of the first control signal and the second control signal.