現今環保意識抬頭，電動車逐漸成為趨勢，用於車用電池充電器等應用場合之功率轉換器需具備大輸出功率、寬輸出電壓以及高功率密度等特點。因此本論文實作一台三階混合全橋LLC諧振轉換器以符合上述應用需求。本論文首先提出一固定工作頻率，調節輔助開關責任週期之控制法，降低控制難度，使電路能工作於二階模式與三階模式，並根據輸出電壓與負載情況進行平滑切換，實現寬輸出電壓與高效率之目標。此外，由於目前文獻中提出之效率最佳化研究皆僅考慮單一負載情境，而轉換器應用於電池充電應用場合時，其負載會隨充電過程而持續改變，針對此一需求，本論文提出一結合LLC諧振轉換器之工作區域分析、損耗分析及金鷹演算法之效率最佳化設計方法以求解最佳諧振槽設計參數，進而實現最佳綜合效率。
本研究最後實際完成一台1250W，輸入電壓500V，輸出電壓360-500V，最大輸出電流2.5A的三階混合全橋LLC諧振轉換器，針對120串ICR-18650M之電池組規格，驗證本研究所提出的控制法與金鷹演算法求得之最佳諧振槽參數的正確性與可行性。由實驗結果可知當輸出電壓500V且輸出80%負載時，所提電路可達最高效率97.3%，且針對實際定電流-定電壓充電法各負載之時間比重進行量測可得綜合效率為95.7%。

As environmental awareness is on the rise, electric vehicles (EV) have rapidly grown in popularity nowadays. An EV charging converter requires large power, wide output voltage range and high power density. To achieve the above requirements, a three-level full-bridge LLC resonant converter is developed in this dissertation. A simple constant frequency modulation method is firstly proposed which adjusts the duty cycles of the auxiliary switches to achieve the voltage control in two-level or three-level mode, the complexity of this presented control can be greatly reduced. Besides, unlike the previous studies only consider a single load condition, this paper takes the multiple charging scenario into account and perform optimization. However, when the converter is used in battery charging application, its load will continue to change with the charging process. To address this issue, multiple load scenarios are considered during the battery charging process in this study. With the investigation on operating regions, losses analysis and golden eagle optimizer, the optimized design parameters and highest overall efficiency are obtained. A 1250W three-level full-bridge LLC resonant converter with 500V input and 360-500V/2.5A output is realized. A battery module consisting of 120 ICR-18650M batteries in series is used to validate the proposed control method and verify the feasibility and accuracy of the parameters collected from golden eagle optimizer. From the experimental results, when the load is at 80% and 500V, the proposed circuit can reach a maximum efficiency of 97.3%. The overall efficiency can be obtained by measuring the time proportion of each load in the actual constant current- constant voltage charging method as 95.7%.

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