Patent ID: 7005204

Claim:
A method for operating a fuel cell power supply, the fuel cell power supply comprising: a fuel cell; reacting gas supply means for supplying a reacting gas to said fuel cell; fuel cell control means for controlling an amount of the reacting gas supplied from said reacting gas supply means to said fuel cell based on a target supply current determined depending on a current demanded by a load when said fuel cell is connected to the load and a current is supplied to the load; and a capacitor connected parallel to said fuel cell and chargeable by said fuel cell, said capacitor being dischargeable to supply the current demanded by the load when said target supply current increases within a time shorter than a response delay which is caused in said fuel cell while said fuel cell control means controls an output current of said fuel cell, and the output current of said fuel cell is smaller than the current demanded by the load; wherein said method comprises the steps of: recognizing a charging/discharging state of said capacitor; and performing, when said target supply current undergoes a change causing said response delay, at least one of a first correcting process of reducing said target supply current if said change is an increase in said target supply current, and a second correcting process of increasing said target supply current if said change is a reduction in said target supply current, depending on the recognized charging/discharging state of said capacitor.