近年來鋰離子電池在可攜式產品、電動車及再生能源系統之能量儲存上扮演相當重要之角色。為了使鋰離子電池發揮最大性能，一個快速又安全的充電技術變得相當重要。因此，本論文提出以田口方法為基礎，運用直交表分別針對多階段完全充電波形及多階段快速充電波形進行搜尋。本論文詳細分析探討多階段定電流充電技術之問題描述、實現過程及參數設定方法。另外，本論文提出一四相交錯式降壓轉換器作為充電電路，並運用元件可程式規劃邏輯閘陣列數位控制器完成多階段定電流充電技術。本論文詳細分析探討多階段數位充電機之硬體及韌體架構。
實驗結果顯示多階段完全充電波形在157.4分鐘內能達到96.6%的放電容量，而多階段快速充電波形在48.2分鐘內能達到86.9%的放電容量，因此田口方法確實能達到多階段充電波形之搜尋，並具有快速收斂及容易實現等優點。

Lithium-ion batteries are playing important roles as energy storage solutions for portable devices, automotive electronics and renewable energy systems. In order to maximize the performance of lithium–ion batteries, an advanced rapid charging pattern is required. In this dissertation, a Taguchi-based algorithm is presented. Orthogonal arrays are implemented to determine the multi-step complete charging pattern (MCCP) and the multi-step rapid charging pattern (MRCP) for multi-step constant current charging technology, respectively. The problem formulation, implementation procedure and parameter setting method are described and explained in detail for multi-step constant current charging technology. In addition, in this dissertation, a four-phase interleaved buck converter is used as the power stage and a field programmable gate array (FPGA) digital-controller is utilized to realize multi-step constant-current charging technology. The hardware and firmware parts of the proposed system will also be described and explained in detail.
Experimental results show that the obtained multi-step complete charging pattern is capable of charging the lithium–ion batteries to 96.6% capacity in 157.4 minutes. Experimental results show that the obtained multi-step rapid charging pattern is capable of charging the lithium–ion batteries to 86.9 % capacity in 48.2 minutes. Therefore, the proposed technique can quickly converge to the multi-step charge pattern, and it can easily be implemented.

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