Patent ID: 8247928

Claim:
A mobile phone comprising: a signal processor; an operating module with a working voltage bigger than that of the signal processor; and a power supply system comprising: a power source; a voltage boosting unit with an input terminal and an output terminal thereof connected to the power source and the operating module, respectively; a first switch connected between the power source and the signal processor; a second switch connected between the output terminal of the voltage boosting unit and the signal processor; and a controller configured for connecting the signal processor to the power source or the output terminal of the voltage boosting unit, both the first switch and the second switch controlled by the controller, the controller figured for comparing the output voltage of the power source to a preset threshold voltage, and determining whether the output voltage of the power source being smaller than the preset threshold voltage, when the output voltage of the power source is bigger than the preset threshold voltage, and the controller keeps the first switch switching on, and the second switch switching off, when the output voltage of the power source is smaller than the preset threshold voltage, the controller switches on the second switch and switch off the first switch.