Patent ID: 7149902

Claim:
An apparatus having a power saving function, for supplying power to a set which performs an intrinsic function, the apparatus comprising: an auxiliary power generator which generates auxiliary power for the set in response to a power cutoff ON signal; and a main power generator which senses the generation of the auxiliary power and generates main power in response to the sensed generation of the auxiliary power and a control signal supplied by the set based on an operational state of the set and the set performs the intrinsic function when the control signal indicates a change from a power saving mode or a cutoff mode to a normal mode, wherein, when the control signal indicates a change from the normal mode or the power saving mode to the cutoff mode and a predetermined period has passed, a power cutoff OFF signal is supplied to cut off the generation of the auxiliary power and the main power, and absent the power cutoff OFF signal, the set performs the intrinsic function in response to the main power and stands by to perform the intrinsic function in response to the auxiliary power.