Patent ID: 8289027

Claim:
A voltage monitoring apparatus of a fuel cell including a plurality of unit cells arranged and coupled in series, wherein the fuel cell voltage monitoring apparatus comprises: a reference voltage generator for receiving output voltages from two points on an array of a plurality of unit cells which are connected in series, and generating a predetermined reference voltage from the output voltages from the two points, at least two unit cells of the array being connected between the two points; a voltage comparator for receiving an output voltage of a first electrode of a monitor unit cell in the unit cell array, an output voltage of a second electrode of the monitor unit cell, and the reference voltage, and determining whether a generation voltage of the monitor unit cell is given within a predetermined allowable voltage range; a signal separator for outputting a signal that is electrically separated from an output signal of the voltage comparator; and an operation processor for determining normality of a cell voltage from a signal output by the signal separator, wherein the voltage comparator comprises a comparator including: a first input terminal for receiving a voltage applied to a first terminal of the reference voltage generator; a second input terminal for receiving an output voltage of a second electrode of the monitor unit cell; a third input terminal for receiving the reference voltage; and a fourth input terminal for receiving the voltage applied to a second terminal of the reference voltage generator.