The present invention relates to energy-efficient battery charging device for a mobile device, specifically, the power supply end and a first ground in the charging apparatus having a stage and a second ground end, rectifies receives the commercial power supply (110 / 220V) output, in common with the holding portion is grounded to the first ground end, the rectifying part of the first ground-stage charging the battery, and through the power supplied from the rectifying unit to be mounted to apply a charging voltage to said power supply stage When connected to a charging section and the power supply end and the track, and a commercial power source side is connected to said second ground end which is grounded and, and the mounting detection portion for detecting the mounting whether or not the battery, the mounting of the battery detected by the mounting detection commercial characterized in that the on / off the power to a control unit for controlling the operation of the rectifying section and the charging section coming It shall be.; Therefore, according to the present invention configured as described above, photo-trimethyl evil-trimethyl through the all-circuit evil determine whether the battery is installed, and only when the battery is mounted to supply power to the rectifying section and live parts simplify the circuit by ensuring that the battery is charged It may be, it is possible to prevent unnecessary power consumption.
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