Patent ID: 8736104

Claim:
A power supply to be connected between an alternating current (AC) power source and a power module of a motherboard to power the motherboard, the power supply comprising: an alternating current to direct current (AC/DC) converter connected to the AC power source to receive an AC voltage from the AC power source and to convert the AC voltage into a DC voltage; a control unit comprising: a controller; and a switch connected between the controller and the power module, and connected to the AC/DC converter; and a selection switch connected to the controller, and connected between the AC/DC converter and the power module of the motherboard to connect the AC/DC converter either to the power module or to connect the AC/DC convert to the controller; wherein when the AC/DC converter is connected to the controller, the controller receives the DC voltage from the AC/DC converter, the controller stores a predetermined connection time and a predetermined disconnection time, when the controller is started, the controller turns on the switch for the predetermined connection time to make the DC voltage be input to the power module, and turns off the switch for the predetermined disconnection time to make the DC voltage fail to be input to the power module after turning on the switch for the predetermined connection time.