Patent ID: 7466137

Claim:
An apparatus for measuring voltage which measures an output voltage between at least one pair of detecting terminals provided on fuel cell stack comprising one or more power generating cells that are stacked together, comprising: a first connecting terminal connected to one of the detecting terminals in the at least one pair of detecting terminals; a second connecting terminal connected to the other detecting terminal of the at least one pair of detecting terminals; a capacitor connected between the first connecting terminal and the second connecting terminal; a voltage detecting means for measuring a voltage of the capacitor; a pre-charging means for pre-charging the capacitor with a predetermined voltage, wherein the predetermined voltage is different than a voltage which the fuel cell stack outputs to the at least one pair of detecting terminals, the predetermined voltage is negative with respect to the output voltage from the fuel cell stack; and a controlling means for comparing the voltage of the capacitor with the voltage which the fuel cell stack outputs.