Patent ID: 7213160

Claim:
A power management apparatus which manages a power supply that supplies power to an electric device, the power management apparatus comprising: a power-saving control component which switches the suppliance of power to the electric device from a normal mode to a power saving mode for cutting off unnecessary suppliance of power when a shutdown signal is input at a predetermined time from a control system of the electric device; a monitoring component which monitors presence/absence of an input of a return signal for making the suppliance of power to the electric device return from the power saving mode to the normal mode; a return control component which switches the suppliance of power to the electric device from the power saving mode to the normal mode when the monitoring component detects the input of the return signal; and a masking component which masks an uncertain signal after the monitoring component detects the input of the return signal for a period that starts by input of the uncertain signal from a device to which the suppliance of power has been cut off by the power saving mode and does not end until a voltage of the power supply that starts the suppliance of power to the device becomes an operation-guaranteeing voltage, at which the suppliance of power from the power supply is stabilized, wherein the uncertain signal is the shutdown signal, and is output from the electric device and input to the power-saving control component which is in operation both in the normal mode and the power saving mode.