Patent ID: 7129674

Claim:
A power supply apparatus comprising: a fuel cell; a secondary battery for supplying power to a load; a power measurement section for measuring an output power of said fuel cell; a power converter which inputs said output power of said fuel cell, controls an output power so that an input voltage or an input current approaches an operation target value, supplies said output power to said load and/or said secondary battery and conducts a power conversion; and a control section which: controls quantity of fuel to be supplied to said fuel cell, indicates a selected value to said power converter as said operation target value, said selected value being a value within a predetermined range of values that corresponds to the smallest quantity of fuel that said fuel cell discharges, indicates a plurality of power measurement target values to said power converter, and updates said operation target value of said power converter based on a plurality of output power measurements of said fuel cell, each of said plurality of output power measurements being measured by said power measurement section for each of said plurality of said power measurement target values.