Apparatus and method for measuring voltage of the fuel cell stack using a capacitor

A method for measuring voltage which measures output voltage between at least one pair of detecting terminals provided on a fuel cell stack comprising one or more power generating cells that are stacked together, comprising steps of:

• pre-charging a 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;
• connecting the capacitor to the at least one pair of detecting terminals to measure the voltage of the capacitor and obtain the output voltage between the at least one pair of detecting terminals;
• and
• comparing the voltage of the capacitor with the output voltage between the at least one pair of detecting terminals.

An apparatus for measuring voltage which measures an output voltage between at least one pair of detecting terminals provided on a 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 of the 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 detector for measuring a voltage of the capacitor;
• a pre-charger 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 controller for comparing the voltage of the capacitor with the voltage which the fuel cell stack outputs.

A method for measuring voltage which measures output voltage between at least one pair of detecting terminals provided on a fuel cell stack comprising one or more power generating cells that are stacked together, comprising steps of:

• pre-charging a 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 object under measurement;
• connecting the capacitor to the at least one pair of detecting terminals to measure the voltage of the capacitor and obtain the output voltage between the at least one pair of detecting terminals;
• and
• comparing the voltage of the capacitor with the output voltage between the at least one pair of detecting terminals.