本論文以理論推導LLC諧振轉換器轉移函數及回授控制，經由分析與計算轉移函數中的 參數，對轉移函數曲線的影響並做深入探討。在此本論文利用詳細的設計步驟來實現設計系統與模擬建置LLC諧振轉換器。主要模擬軟體是藉由SIMetrix/SIMPLIS建置電源IC控制方塊模組，透過變頻控制改變諧振槽特性以達到輸出電壓調變之目的，設計怠滯區間避免功率開關短路，以零電壓開關切換技術來減少功率開關的損耗；並實作120W半橋LLC諧振轉換器，輸入電壓為380V，輸出為24V/5A，效率最高可達91.37%，量測輕載至滿載之波形，以驗證理論之分析與規劃的系統特性。最後與現有文獻效率比較，比較結果顯示，只要透過本論文設計步驟製作系統，除了可使設計者更易於上手之外且可獲得較佳之系統效率。

This thesis included the theoretical derivation of the LLC resonant converter for the transfer function and feedback control. The impact of the curve of transfer functions was made further explored through analysis and calculation of the parameters of the transfer functions. This thesis used detailed design procedures to achieve the design and to simulate how to build an LLC resonant converter. The main simulation software is SIMetrix/SIMPLIS which builds the block module of power IC control. Using frequency conversion control changed the characteristics of the resonant slot to achieve the purpose of the output voltage modulation. The design of dead-time interval avoided short-circuiting of the power switch. Zero-switching technology reduced switching losses. This thesis implemented a 120W half-bridge converter. which has input voltage, 380V, and output, 24V/5A. The efficiency was up to 91.37%. The measurement waveform from light load to full load verified the theoretical analysis and planning system features. Finally, the efficiency in this thesis was compared with the efficiency in the existing literatures. The comparison results show that following the system design steps of this thesis enables designers to easily start and get the better system efficiency.

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