METHOD OF OPERATING A FUEL CELL/BATTERY PASSIVE HYBRID POWER SUPPLY
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United States of America Patent
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Issued Date -
May 12, 2011
app pub date -
Nov 10, 2010
filing date -
Nov 10, 2009
priority date (Note) -
Abandoned
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Abstract
The method of operating a passive hybrid power supply in, or near, zero connected load conditions comprises the steps of: supplying a stream of substantially pure hydrogen to the anode of the fuel cell; supplying an stream of substantially pure oxygen to the cathode of the fuel cell; monitoring an electric current supplied by the storage battery; monitoring an output voltage shared by the fuel cell and the battery; evaluating a state of charge (SOC) of the battery based on the electric current and the output voltage; monitoring a hydrogen pressure in the fuel cell; monitoring an oxygen pressure in the fuel cell; limiting the stream of hydrogen and the stream of oxygen and actuating the hydrogen and oxygen recirculating pumps in such a way as to bring and maintain the hydrogen and oxygen pressures below 0.7 bar.sub.absolute while maintaining the hydrogen pressure between 70 and 130% of the oxygen pressure, in such a way as to ensure that the output voltage is maintained at a level corresponding to less than 0.90 volts/cell and does not exceed the maximum voltage limit of the battery.
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