Invention Grant

Electronic device
Abstract:
An electronic device includes a battery, a detecting unit, a comparing unit, a control unit and a charging circuit. The detecting unit is electronically connected to a universal serial bus (USB) interface to detect and determine whether or not the connecting device is a power adapter. The comparing unit outputs a level signal depending upon the comparing unit comparing a input signal received by the USB interface with a voltage threshold. The control unit controls the battery either to be charged by the connecting device through the charging circuit or the battery to supply power to the connecting device through the USB interface according to the level signal.
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