Controlling power efficiency of an information processing device

1. An apparatus comprising:

a battery pack that stores first power including a first voltage;

an information processing device that consumes second power including a second voltage that is less than the first voltage; and

a voltage converter that:

converts an input voltage into a predetermined first output voltage for charging the battery pack with the first power including the first voltage in response to receiving a charge control signal for charging the battery pack, and

converts the first power including the first voltage stored in the battery pack into a predetermined second output voltage for powering the information processing device with the second power including the second voltage in response to receiving a discharge control signal for the battery pack; and

a controller that determines the input voltage.

2. The apparatus of claim 1 , wherein the input voltage exceeds the predetermined second output voltage.

3. The apparatus of claim 1 , further comprising an input/output (“I/O”) interface configured to:

enable power to be supplied to the information processing device from an external source; and

transmit voltage control data from a control unit of the information processing device to the external source.

4. The apparatus of claim 1 , wherein the controller determines a lower input voltage in response to determining that the information processing device is in a low-power operating mode.

5. The apparatus of claim 3 , wherein the controller determines a higher input voltage in response to the information processing device executing a scheduled task than in response to the information processing device not executing the scheduled task.

6. The apparatus of claim 1 wherein the controller determines the input voltage based on a processor usage rate for the information processing device.

7. The apparatus of claim 1 , further comprising a temperature sensor that detects a temperature of the information processing device, wherein the controller determines the input voltage based on the temperature.

8. The apparatus of claim 1 , further comprising an acceleration sensor that detects an acceleration of the information processing device, wherein the controller:

determines mobility of the information processing device based on the acceleration; and

determines the input voltage based on the mobility.

9. A method comprising:

converting an input voltage into a predetermined first output voltage for charging a battery pack with first power including first voltage in response to receiving a charge control signal for charging the battery pack;

converting the first power including the first voltage stored in the battery pack into a predetermined second output voltage for powering an information processing device with second power including a second voltage in response to receiving a discharge control signal for the battery pack;

suppling the second power including the second voltage to the information processing device; and

determining the input voltage.

10. The method of claim 9 , wherein the input voltage exceeds the predetermined second output voltage.

11. The method of claim 9 , further comprising:

controlling power supplied to the information processing device by an external source; and

transmitting voltage control data from a control unit of the information processing device to the external source.

12. The method of claim 9 , further comprising determining a lower input voltage in response to determining that the information processing device is in a low-power operating mode.

13. The method of claim 12 , further comprising determining a higher input voltage in response to the information processing device executing a scheduled task than in response to the information processing device not executing the scheduled task.

14. The method of claim 9 , further comprising determining the input voltage based on a processor usage rate for the information processing device.

15. The method of claim 9 , further comprising determining the input voltage based on a temperature of the information processing device.

16. The method of claim 9 , further comprising determining the input voltage based on mobility of the information processing device.

17. A system comprising:

an information processing device that consumes second power including a second voltage, comprising:

a battery pack that stores first power including a first voltage;

a voltage converter that:

converts an input voltage into a predetermined first output voltage for charging the battery pack with the first power including the first voltage in response to receiving a charge control signal for charging the battery pack, and

converts the first power including the first voltage stored in the battery pack into a predetermined second output voltage for powering the information processing device with the second power including the second voltage in response to receiving a discharge control signal for the battery pack,

wherein the information processing device consumes the second power supplied by the voltage converter;

a controller that determines the input voltage; and

a power adapter external to the information procession device that supplies power to the voltage converter.

18. The system of claim 17 , wherein the input voltage exceeds the predetermined second output voltage.

19. The system of claim 17 , further comprising a temperature sensor that detects a temperature of the information processing device, wherein the controller determines the input voltage based on the temperature.

20. The apparatus of claim 17 , further comprising an acceleration sensor that detects an acceleration of the information processing device, wherein the controller:

determines mobility of the information processing device based on the acceleration; and

determines the input voltage based on the mobility.