A fuel cell power supply has a fuel cell and a capacitor which are connected parallel to each other, and controls the amount of a reacting gas supplied to the fuel gas based on a target supply current. A capacitor open voltage calculator calculates an open voltage of the capacitor from a detected current...http://www.google.co.uk/patents/US7005204?utm_source=gb-gplus-sharePatent US7005204 - Fuel cell power supply
