Method of controlling battery power, power control apparatus, and portable device using the same

Abstract

A method for controlling batteries, a power control apparatus, and a portable device using the same are provided. Based on a connection status of a main battery and an auxiliary battery and the relative magnitudes of voltage of the main battery and the auxiliary battery, supplying of electric power from the main battery or an integrated power source integrating the main battery voltage with the auxiliary battery voltage, recharging of the main battery and the auxiliary battery respectively or simultaneously, and the connection between the main battery and the auxiliary battery when the portable device is turned off are controlled so that electric power of the portable device using a plurality of batteries can be effectively supplied.

1 . A portable device comprising:
 a power supply unit, to which a main battery and an auxiliary battery are detachably mounted, for controlling a switch disposed between the main battery and the auxiliary battery to independently output a main battery voltage when the main battery voltage is higher than an auxiliary battery voltage, and to output an integrated voltage by integrating the main battery voltage with the auxiliary battery voltage when the main battery voltage is equal to or lower than the auxiliary battery voltage;   a controller for supplying a power control signal for controlling the switch; and   a display for displaying the integrated voltage from integrating the main battery voltage with the auxiliary battery voltage when both the main battery and the auxiliary battery are connected to the portable device and operate as an integrated power source.   
     
     
         2 . The portable device of  claim 1 , wherein the display displays the integrated voltage integrating the main battery voltage with the auxiliary battery voltage when the main battery voltage is equal to or lower than the auxiliary battery voltage.