STATE DIAGNOSTIC APPARATUS OF FUEL CELL STACK

摘要

An apparatus for diagnosing a state of a fuel cell stack is provided. The apparatus may diagnose the state of the fuel cell stack without including the DC-DC converter which boosts the DC voltage and the inverter which converts the boosted DC voltage into the AC voltage. In particular, the apparatus may diagnose the state of the fuel cell by applying the rectangular wave of the single frequency having a duty ration of about 0.5 to the fuel cell stack, measuring the voltage of the fuel cell stack, detecting the even multiple harmonic component of the frequency of the rectangular wave by performing the frequency conversion on the measured voltage, and then diagnosing the state of the fuel cell stack based on the magnitude of the detected harmonic component.

主权项

1. An apparatus for diagnosing a state of a fuel cell stack, comprising:
a driver configured to turn on and off a power transistor based on a driving frequency; a power transistor driven based on a control of the driver to such that a rectangular wave current component of a single frequency is included in a current of the fuel cell stack; and a diagnostic controller configured to set the driving frequency, measure a voltage of the fuel cell stack, and convert the voltage into a frequency to detect even multiple harmonic components of a rectangular wave frequency, and diagnose a state of the fuel cell stack based on a magnitude of the detected harmonic components.