| 摘要 |
Voltage reversal in fuel cell stacks may be detected and/or prevented by monitoring each cell or small groups of cells in the stack for low voltage conditions. An improved cell voltage monitor (2) is constructed using a plurality of voltage monitoring units in which each unit comprises a heating resistor (Hi), a rectifier (Ri) in series therewith, and a sensing thermisto r (STi) in thermal communication with the heating resistor. The heating resist or is electrically-connected across a cell or cells and heats the associated sensing thermistor in accordance with the voltage of the cell(s). Since the resistance of the sensing thermistor is indicative of its temperature and hence also of voltage of the cell(s), the sensing thermistor resistance can be used to signal a low voltage condition. |
