Patent ID: 6670063
Filing Date: 2003-12-30
Classification: H01M,H02J,Y02E,Y10S

Abstract:
A fuel cell system comprising:a fuel cell; a step-down type DC-to-DC converter connected with an output of the fuel cell; a load connected with the DC-to-DC converter; and a battery connected in parallel with the load to correct an excess and deficiency of a current supplied from the fuel cell to the load, wherein a mass of fuel supplied to the fuel cell is controlled according to a demand power signal indicating a current demanded by the load and a charge condition of battery; wherein an output current threshold of the fuel cell above which an output voltage of the fuel cell is lower than a no-load voltage of the battery is determined; and wherein if an output current of the fuel cell is greater than the output current threshold, the mass of fuel supplied to the fuel is limited so that the battery is prevented from being charged by the output current of the fuel cell.