| 摘要 |
Disclosed is an external battery pack apparatus for providing a portable appliance with a power-supply voltage. The apparatus includes an adapter for containing a power-supply terminal and output voltage setting terminals, and programming an output voltage by short-circuiting or open-circuiting at least one pair among the above terminals; a cable connected to the adapter; and a main body for containing a battery, a charging controller for charging the battery, and an output controller for performing a DC-to-DC conversion on a voltage charged in the battery and outputting the DC-to-DC converted voltage to the adapter via the cable, detecting a programming status of the adapter, and varying an output voltage in response to the detected programming status.
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