| 摘要 |
An electronic apparatus capable of using an external power source and a power source from a bus, such as a universal serial bus (USB) power source, is disclosed. The external power source and the USB power source output a first and a second operating voltage to the electronic apparatus, respectively. The electronic apparatus includes a first group of devices operative at the first operating voltage, a second group of devices operative at the second operating voltage, and an input power control circuit. The input power control circuit is coupled to the first and second groups of devices, and is capable of being coupled to the external and the USB power sources. The input power control circuit is used for controlling the first and the second operating voltages in order to feed the first and second groups of devices with the first and the second operating voltages, respectively.
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