Patent ID: 8828568

Claim:
A fuel cell system comprising: a fuel cell; and a load connected to the fuel cell, the fuel cell system further comprising: a converter which is interposed between the fuel cell and the load and which raises the output voltage of the fuel cell to output the voltage to the load; an inverter which converts a direct-current power output from the converter into an alternate-current power to output the power to the load; a controller which controls the fuel cell, the converter and the inverter; a converter control unit which transmits or receives a signal to or from the controller to control the converter; an inverter control unit which transmits or receives a signal to or from the controller to control the inverter; and an abnormality signal line that connects the converter and the inverter and does not pass through the converter control unit or the inverter control unit, wherein when abnormality occurs in one of the converter and the inverter, an abnormality signal to inform the occurrence of the abnormality does not pass through the converter control unit or the inverter control unit but is transmitted via the abnormality signal line to the other of the converter and the inverter, to stop both of the converter and the inverter.