| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === In this thesis, an intelligent cell balancing scheme based on fuzzy logic control (FLC) is proposed to adaptively control the equalizing current of series-connected lithium-ion batteries. The power stage utilized in this thesis is a bidirectional flyback converter. Using this topology, bidirectional energy transfer between an individual cell and the whole battery pack can be achieved. Using this approach, efficient cell balancing can be achieved.
However, if the duty cycle of the bidirectional flyback converter is kept constant, the balancing current will decrease as the cell voltage decreases; this will correspondingly increase the balancing time. To deal with this problem, a FLC-based balancing algorithm is proposed. The presented FLC-based technique can adjust the duty cycle value according to the measured voltage and keeps the balancing current nearly constant. Comparing with fixed-duty-cycle and multi-stage duty-cycle approaches,
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