| 摘要 |
A system and method for providing power to a mobile device from two power sources. According to embodiments described herein, a mobile device, such as a cell phone, may include a main battery and an auxiliary battery. The mobile device includes a power management circuit that utilizes a charge-control circuit and a power-selection circuit for implementing a power-management schema. The charge-control circuit may exclusively couple the main battery or the auxiliary battery to an external power source for charging. The power-selection circuit may exclusively couple the main battery or the auxiliary battery for providing power to the mobile device. The system further includes a controller that controls the coupling of the main battery and the auxiliary battery such that if the main battery falls below a sufficient voltage level, the auxiliary battery may be immediately engaged without interruption of the operation of the mobile device.
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