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A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power includes a voltage sensor for sensing a voltage from the first power supply. A control unit is coupled to the voltage sensor and is coupled for receiving power from the first

A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power includes a voltage sensor for sensing a voltage from the first power supply. A control unit is coupled to the voltage sensor and is coupled for receiving power from the first power supply and the second power supply. The control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a selected value, and the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above the selected value.

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What is claimed is: 1. A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power comprising: a voltage sensor for sensing a voltage from the first power supply; a control unit coupled to the voltage sensor and coupled for receiving

What is claimed is: 1. A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power comprising: a voltage sensor for sensing a voltage from the first power supply; a control unit coupled to the voltage sensor and coupled for receiving power from the first power supply and the second power supply; wherein the control unit comprises: a first power supply switch coupled for outputting power from the first power supply; and a separate second power supply switch coupled for outputting power from the second power supply; wherein the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above a first selected value, wherein the control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a second selected value, and wherein the voltage sensor actually switches the first power supply switch and the second power supply switch a second power supply voltage sensor for sensing a voltage from the second power supply, wherein the control unit is coupled to the second power supply voltage sensor, wherein the control unit outputs power from the first power supply when the voltage sensed by the second power supply voltage sensor is below a third selected value, and wherein the control unit outputs power from the second power supply when the voltage sensed by the second power supply voltage sensor is above a fourth selected value. 2. The apparatus according to claim 1 wherein the control unit outputs power only from the second power supply when the voltage sensed by the voltage sensor is below the second selected value. 3. The apparatus according to claim 1 wherein the control unit outputs power only from the first power supply when the voltage sensed by the voltage sensor is above the first selected value. 4. The apparatus according to claim 1 wherein the first power supply switch comprises a switching voltage regulator. 5. The apparatus according to claim 1 wherein the second power supply switch comprises a transistor. 6. The apparatus according to claim 1 wherein the control unit includes a processor coupled to the first power supply switch and to the second power supply switch, wherein the first power supply switch and the second power supply switch are controlled at least in part by the processor. 7. The apparatus according to claim 6 further comprising a second power supply voltage sensor for sensing a voltage from the second power supply, wherein the processor is coupled to the second power supply voltage sensor, and wherein the processor controls the first power supply switch and the second power supply switch in response to the voltage sensed by the second power supply voltage sensor. 8. The apparatus according to claim 7 wherein the processor controls the first power supply switch to output power from the first power supply when the voltage sensed by the second power supply voltage sensor is below a third selected value, and wherein the processor controls the second power supply switch to output power from the second power supply when the voltage sensed by the second power supply voltage sensor is above a fourth selected value. 9. The apparatus according to claim 8 wherein the first selected value equals the second selected value. 10. The apparatus according to claim 8 wherein the third selected value equals the fourth selected value. 11. The apparatus according to claim 8 wherein the first selected value equals the second selected value, and wherein the third selected value equals the fourth selected value. 12. The apparatus according to claim 8 wherein the first power supply switch comprises a switching voltage regulator, and wherein the second power supply switch comprises a transistor. 13. The apparatus according to claim 1 further comprising a housing, wherein the voltage sensor and the control unit are both disposed within the housing. 14. The apparatus according to claim 1 wherein the first selected value equals the second selected value. 15. The apparatus according to claim 1 wherein the control unit switches power from the first power supply to the second power supply when the voltage sensed by the voltage sensor is below the second selected value. 16. The apparatus according to claim 1 wherein the control unit switches power from the second power supply to the first power supply when the voltage sensed by the voltage sensor is above the first selected value. 17. The apparatus according to claim 1 wherein the control unit switches power from the first power supply to the second power supply when the voltage sensed by the voltage sensor is below the second selected value, and wherein the control unit switches power from the second power supply back to the first power supply when the voltage sensed by the voltage sensor is above the first selected value. 18. The apparatus according to claim 17 wherein the first selected value equals the second selected value. 19. The apparatus according to claim 1 wherein the first selected value equals the second selected value. 20. The apparatus according to claim 1 wherein the third selected value equals the fourth selected value. 21. The apparatus according to claim 1 wherein the first selected value equals the second selected value, and wherein the third selected value equals the fourth selected value. 22. A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power comprising: a voltage sensor for sensing a voltage from the first power supply; a control unit coupled to the voltage sensor and coupled for receiving power from the first power supply and the second power supply; wherein the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above a first selected value, and wherein the control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a second selected value; a second power supply voltage sensor for sensing a voltage from the second power supply, wherein the control unit is coupled to the second power supply voltage sensor; wherein the control unit outputs power from the first power supply when the voltage sensed by the second power supply voltage sensor is below a third selected value, and wherein the control unit outputs power from the second power supply when the voltage sensed by the second power supply voltage sensor is above a fourth selected value; and wherein the control unit outputs power only from the second power supply when the voltage sensed by the second power supply voltage sensor is above the fourth selected value even when the voltage sensed by the voltage sensor is above the first selected value. 23. A power control apparatus for a bicycle that uses a first power supply and a second power supply to provide electrical power comprising: a voltage sensor for sensing a voltage from the first power supply; a control unit coupled to the voltage sensor and coupled for receiving power from the first power supply and the second power supply; wherein the control unit comprises: a first power supply switch coupled for outputting power from the first power supply; a second power supply switch coupled for outputting power from the second power supply; and a processor coupled to the first power supply switch and to the second power supply switch, wherein the first power supply switch and the second power supply switch are controlled at least in part by the processor; wherein the control unit outputs power from the first power supply when the voltage sensed by the voltage sensor is above a first selected value, and wherein the control unit outputs power from the second power supply when the voltage sensed by the voltage sensor is below a second selected value; a second power supply voltage sensor for sensing a voltage from the second power supply, wherein the processor is coupled to the second power supply voltage sensor, and wherein the processor controls the first power supply switch and the second power supply switch in response to the voltage sensed by the second power supply voltage sensor; wherein the processor controls the first power supply switch to output power from the first power supply when the voltage sensed by the second power supply voltage sensor is below a third selected value, and wherein the processor controls the second power supply switch to output power from the second power supply when the voltage sensed by the second power supply voltage sensor is above a fourth selected value; and wherein the processor controls the first power supply switch and the second power supply switch to output power only from the second power supply when the voltage sensed by the second power supply voltage sensor is above the fourth selected value even when the voltage sensed by the voltage sensor is above the first selected value.