Patent ID: 7919885
Filing Date: 2011-04-05
Classification: H02J

Abstract:
1. A power control method of a portable device comprising a detachable main battery and a detachable auxiliary battery, the power control method comprising: determining whether the main battery is attached to the portable device and a voltage of the main battery if it is attached; determining whether the auxiliary battery is attached to the portable device and a voltage of the auxiliary battery if it is attached; forming one of a plurality of different power supply paths, each of the plurality of different supply paths corresponding to whether the batteries are attached, the magnitude of the main battery voltage and the magnitude of the auxiliary battery voltage; and outputting at least one of the main battery voltage, the auxiliary battery voltage, and an integrated voltage of the main battery voltage and the auxiliary battery voltage to an output unit, wherein, when the main battery and the auxiliary battery are attached to the portable device, the magnitude of the auxiliary battery voltage is equal to or greater than the main battery voltage, and the portable device is turned off; the forming of the power supply path comprises forming a path connecting the auxiliary battery to the main battery; and the outputting comprises outputting electric power such that the auxiliary battery voltage becomes the same as the main battery voltage using the path.