Patent ID: 7228444

Claim:
A computer-readable medium having computer-executable instructions for performing steps comprising: providing an energy storage medium having a DC voltage; upon an AC power failure occurring while a computer is in a standby state, connecting the energy storage medium to a power supply of the computer for powering operations of the computer, the power supply having a DC-to-DC conversion section and the energy storage medium being connected to an input of the DC-to-DC conversion section; waking the computer from the standby state to enter a working state in response to the AC power failure; sending a backup-power-critical signal to an operating system of the computer to trigger the operating system to store state data of the computer in a non-volatile memory and put the computer into a hibernation state, the backup-power-critical signal being sent when the energy storage medium is not at a critically low energy level; and disconnecting the energy storage medium from the power supply after the computer is in the hibernation state.