Patent ID: 9385544
Filing Date: 2016-07-05
CPC Classification: H02J

Claim Text:
1. An external battery comprising: an input end; an output end; a bare cell between the input end and the output end; a charging unit configured to deliver power from a charger to the bare cell via the input end; a first switch between the charging unit and the input end; a DC-DC converter configured to convert an output voltage from the bare cell into a converted voltage of a magnitude that is different from that of the output voltage, and configured to deliver the converted voltage to the output end; a second switch between the bare cell and the DC-DC converter; and a main controller unit (MCU) configured to sense at least one of overcharging, over-discharging, or an over-discharge current of the bare cell using the output voltage or an output current from the bare cell, and configured to control the first switch and the second switch to charge or discharge the bare cell based on whether the at least one of overcharging, over-discharging, or the over-discharge current of the bare cell is sensed.