Patent ID: 8572414

Claim:
A power supply system for an electronic device, comprising: a power supply unit adapted to convert an AC power into a first DC power; a DC/DC converter connected to the power supply unit, the DC/DC converter adapted to convert the first DC power into a second DC power; a super I/O chipset, the DC/DC converter connected to the super I/O chipset directly to provide the second DC power to the super I/O chipset; and a south bridge chipset connected to the DC/DC converter via a switch, the switch connected to the super I/O chipset and controlled by the super I/O chipset, wherein the super I/O chipset is adapted to turn on the switch to have the DC/DC converter supply the second DC power to the south bridge chipset, when the electronic device is turned on, and the super I/O chipset is adapted to turn off the switch when the electronic device is shut down; wherein the power supply unit comprises a discharge circuit, the discharge circuit is adapted to discharge remaining current of the power supply unit when the power supply unit does not receive the AC power.