Patent ID: 8129937

Claim:
A driving device for driving a load, comprising: a second cell; a fuel cell; and an energy management module coupled to the secondary cell and the fuel cell and generating a first current or a second current to the load according to a voltage of the fuel cell, wherein when the voltage generated by the fuel cell is less than a preset value, the energy management module provides the first current to the load, and when the voltage generated by the fuel cell exceeds the preset value, the energy management module provides the second current to the load, wherein the second current exceeds the first current; wherein the energy management module comprises: — a voltage transformation unit transforming the voltage of the secondary cell or the voltage of the fuel cell to generate a voltage signal a current generation unit receiving the voltage signal and generating the first current or the second current according to the voltage of the fuel cell; the current generation unit comprising: — a current limit unit providing a first impedance value or second impedance value according to the voltage of the fuel cell; the current limit unit comprises: a first resistor; a second resistor; a first switch connected in series with the second resistor, when the first switch is turned off the first resistor is disconnected from the second resistor and the current limit provides the first impedance value; when the first switch is turned on the first resistor is connected in parallel with the second resistor and the current limit provides the second impedance value; and a controller generating the first current when the current limit unit provides the first impedance value and generating the second current when the current limit provides the second impedance value.