Patent ID: 7616257

Claim:
An apparatus for controlling a power source in a mobile electronic unit, the apparatus comprising: a battery unit; a switch unit, which is connected to the battery unit and turns on or off the mobile electronic unit; a detection unit, which detects an on or off state of the switch unit; a first power source unit, which is connected to the battery unit, which utilizes two or more channels, and which generates two or more channel voltages to be supplied to elements of the mobile electronic unit, when the mobile electronic unit is in an on mode, wherein the first power source unit generates the two or more channel voltages according to different duty ratios by a pulse width modulation method; a control unit, which controls the first power source unit and the elements of the mobile electronic unit; and a second power source unit to which one channel voltage among the two or more channel voltages generated in the first power source unit is applied when the mobile electronic unit is in an on mode, and to which the output voltage of the battery unit is applied when the mobile electronic unit is in an off mode, and which regulates the applied voltage and applies the regulated voltage as an operational voltage for the control unit when the mobile electronic unit is in an on mode.