| 摘要 |
an analog switch for switching a switching control signal applied from a central processing unit of a cellular phone to thereby output the switched switching control signal; a first switching unit for switching a power output of a main battery in accordance with the switching control signal applied from the analog switch; a second switching unit for switching an output of an external power in accordance with the switching control signal applied from the analog switch; a regulator for maintaining the power applied from the first and second switching unit to supply the power as an operating power to the cellular phone; and a diode for transmitting the power applied from the second switching unit to the regulator, and for protecting a reverse voltage to the second switching unit from being supplied during the first switching unit operates.
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