本文研製操作於不連續導通模式下之雙向降升壓式平衡器，使電
池組中相鄰電池能量可雙向傳遞，進而解決電池電量不平衡問題，並
提出兩種可縮短平衡時間之控制方法，分別為變動責任週期法及最佳
責任週期法。
若使用文獻中將雙向降升壓式轉換器之開關導通週期設為定值
之控制方法，則於平衡過程平衡電流會隨著電量較高之電池電壓下降
而隨之減少，進而導致平衡時間增加，因此本文提出變動責任週期法
及最佳責任週期法改善平衡電流下降問題。其中變動責任週期法透過
電池電壓計算所需開關責任週期大小，使平衡電流於平衡過程皆維持
在目標電流大小，而最佳責任週期法則透過相鄰電池電壓計算出開關
責任週期大小，使切換週期內可傳遞最多能量，進而提升平衡電流大
小。透過三種初始電池電壓條件之平衡實驗可知，變動責任週期法相
較固定責任週期法分別節省 10.3%、11.7%及 16%之平衡時間，而最
佳責任週期法相較固定責任週期法分別節省 35.9%、36.6%及 37.3%
之平衡時間。
關鍵字:鋰電池平衡器、雙向降升壓式轉換器、變動責任週期法、最佳
責任週期法

In this thesis, an active equalizer circuit for series-connected lithium-
ion batteries is proposed. The power stage utilized in this thesis is a synchronous buck–boost converter operating in discontinuous conduction mode. Using this topology, bidirectional energy transfers between any cell(s) to any cell(s) can be achieved. Then two control methods that can shorten the balance time are proposed, namely the varied-duty-cycle method and the optimal-duty-cycle method. For the traditional equalizing 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 drops of the battery with more energy; this will correspondingly increase the balancing time. To deal with this problem, varied-duty-cycle method and optimal-duty-cycle method are proposed. The varied-duty-cycle method can adjust the duty cycle value according to the operating condition and thus keep the balancing current nearly constant. The optimal-duty-cycle method can calculate the duty cycle value according to the voltage of the adjacent battery and thus keep the
transmission time of energy approaches the period time of synchronous buck–boost converter. Comparing with the traditional balancing control technique, the varied-duty-cycle method and optimal-duty-cycle method can improve the balancing time by 10.3%, 11.7%, 16% and 35.9%, 36.6%, 37.3% under three battery voltage conditions. Keyword : Equalizer, Bidirectional Synchronous Buck–boost Converter, Varied-duty-cycle Method, Optimal-duty-cycle Method

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