本文研製一雙向降升壓轉換器平衡電路，此平衡器電路著重於極簡化的電感式平衡器架構，並且可以在電池與電池組間或電池組與電池組間進行雙向的電量平衡。透過兩種平衡操作模式能夠有效的使電池組中的電池電量達到平衡。
然而，若本文所使用之雙向降升壓轉換器平衡電路的導通週期皆設定為定值，平衡電流會隨著平衡過程中電池間的電壓差縮小而隨之減少，如此會使得平衡後期的平衡速度減緩，因此本文提出調變責任週期法來進行平衡速度的控制，主要概念為維持平衡電流至定值，使平衡電流不因電池間的電壓差縮小而降低，而此方法將利用電池組中的電池電壓來計算出調變責任週期法所需設定的功率開關責任週期，以保持一恆定的平衡電流。實驗結果顯示與固定責任週期法相比，調變責任週期法能夠有效的減少56%的平衡時間。

In this thesis, an active balancer circuit for series-connected lithium-ion batteries is proposed. The power stage utilized in this thesis is a synchronous buck–boost converter. Using this topology, bidirectional energy transfers between any cell(s) to any cell(s) can be achieved.
For the “natural” balancing control strategy presented in the literature, the duty cycle of the synchronous buck–boost converter is kept constant during the whole balancing process. Hence, the balancing current will decrease as the voltage difference between batteries decreases; this will correspondingly increase the balancing time. To deal with this problem, a balancing algorithm named varied-duty-cycle method is proposed. The proposed techniques can adjust the duty cycle value according to the operating condition and thus keep the balancing current nearly constant. Comparing with the “natural” balancing control technique, the proposed
method can improve the balancing time by 56%.

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