Patent ID: 7821225

Claim:
A power management method for a hybrid power supply, comprising: providing a rechargeable battery; providing a fuel cell; providing a DC-DC converter directly connected to the fuel cell; providing a control unit; acquiring an amount of energy stored in the rechargeable battery to determine an energy level of the rechargeable battery; when the energy level of the rechargeable battery does not exceed a first predetermined value, controlling the fuel cell to output a first voltage to the DC-DC converter; and controlling the DC-DC converter to output a second voltage to the rechargeable battery when the energy level of the rechargeable battery is equal to or exceeds a second predetermined value, wherein when the energy level of the rechargeable battery is between the first predetermined value and the second predetermined value, the control unit controls the fuel cell to increase the voltage output of the fuel cell to the DC-DC converter according to the increasing energy level of the rechargeable battery.