Abstract: A concentration detector is adapted to detect the concentration of a liquid fuel in a container. The concentration detector comprises a rotating mechanism positioned underneath the level of the liquid fuel and having a rotational center. A first float having a specific gravity less than the specific gravity of the liquid fuel, a volume equivalent to “V” and a mass equivalent to “M”. The distance between the mass center of the first float and the rotational center is “L”. A second float connected with the first float and having a specific gravity less than the specific gravity of the liquid fuel, a volume equivalent to “V” and a mass equivalent to “r*M”. The distance between the mass center of the second float and the rotational center is “L. The mass center of the second float, the rotational center and the mass center of the first float constitute an included angle of 120°.

Abstract: A distributed control method for a fuel cell system is disclosed. An auxiliary power source first provides power for a main control unit and a power management unit during the fuel cell system is turned on. The main control unit repeatedly receives status data of fuel cells from the power management unit or actively inquires of the power management unit to determine whether the fuel cell system is abnormal, and real-time regulates the system to maintain it in an optimal condition. The power management unit detects the status of the fuel cell using sensors, produces a corresponding status datum, and then feeds back the status datum to the main control unit. While the fuel cell system is turned off, fuels residual in flow channels of a fuel cell and un-drained products produced by the electrochemical reaction of a fuel cell are cleaned up, and the last status of the fuel cell before shut off is stored.

Abstract: The present invention is to provide a measurement apparatus of measuring fuel capacity used in fuel cell system; the measurement apparatus comprises a sensor device, a resistor, an A/D converter and a controller. The sensor device comprises a first electrode and a second electrode and accommodated in fuel storage and/or fuel flow layer to detect the fuel capacity of the anode, the second electrode connects to a low level voltage, one terminal of the resistor connects to the first electrode, the other terminal electrically connects to a high level voltage. The input terminal of the A/D converter connects to the first electrode and the first terminal of the resistor to input a measuring analog voltage, and also converts into a measuring digital voltage, the controller connects to the A/D converter to input measuring digital voltage and converts into the liquid level of the anode fuel in the fuel storage and/or fuel flow layer.

Abstract: A modular fuel cell is disclosed, which can be assembled with various modular components including a fuel cell module, a control module and a fuel supply module, if desired. The fuel cell module is fabricated by a printed circuit board (PCB) process, and is used to perform an electrochemical reaction and generate power. The control module comprises a PCB and an electric circuit disposed on the PCB. The electric circuit comprises at least an electrical device. The fuel supply module comprises a fuel tank, and at least a pump and/or at least a valve. The pump and/or the valve are controlled by the control module, and at least a pump and/or at least a valve are connected to the fuel cell module.

Abstract: A concentration detector is adapted to detect the concentration of a liquid fuel in a container. The concentration detector comprises a rotating mechanism positioned underneath the level of the liquid fuel and having a rotational center. A first float having a specific gravity less than the specific gravity of the liquid fuel, a volume equivalent to “V” and a mass equivalent to “M”. The distance between the mass center of the first float and the rotational center is “L”. A second float connected with the first float and having a specific gravity less than the specific gravity of the liquid fuel, a volume equivalent to “V” and a mass equivalent to “r*M”. The distance between the mass center of the second float and the rotational center is “L. The mass center of the second float, the rotational center and the mass center of the first float constitute an included angle of 120°.

Abstract: A fuel cell device capable of adjusting operational parameters is disclosed, which includes fuel cell boards, an anode regulator, a cathode regulator, an anodic fuel supplier, and a control circuit. The fuel cell boards include an electrically connected interface to communicate status signals generated by the fuel cell boards during operation. The anode regulator is connected to the anodic fuel inlets and the anodic fuel outlets of the fuel cell boards and provides anodic fuels with predetermined parameters. The cathode regulator adjusts an amount of cathodic fuels supplied for cathodes of the fuel cell boards. The anodic fuel supplier is connected to the anode regulator and contains anodic fuels.

Abstract: The present invention is to provide a measurement apparatus of measuring fuel capacity used in fuel cell system; the measurement apparatus comprises a sensor device, a resistor, an A/D converter and a controller. The sensor device comprises a first electrode and a second electrode and accommodated in fuel storage and/or fuel flow layer to detect the fuel capacity of the anode, the second electrode connects to a low level voltage, one terminal of the resistor connects to the first electrode, the other terminal electrically connects to a high level voltage. The input terminal of the A/D converter connects to the first electrode and the first terminal of the resistor to input a measuring analog voltage, and also converts into a measuring digital voltage, the controller connects to the A/D converter to input measuring digital voltage and converts into the liquid level of the anode fuel in the fuel storage and/or fuel flow layer.

Abstract: A discharging circuit, whereby a triangular discharging current waveform is generated; the ascending section of the triangular discharging current waveform is to be determined by a voltage and an inductance of the circuit, while the variation rate of a descending section of the waveform is to be controlled by an inductance, a peak current and a resistance in the circuit so as to generate a negative and descending current variation rate.