本篇論文主要研製一台最大輸出功率為4 kW的全橋CLLC諧振式轉換器，應用於雙向直流傳輸之充電樁，初級側電網端電壓為400 V、次級側電池端電壓為42 ~ 58 V、滿載輸出功率為4 kW的全橋CLLC諧振式轉換器。本文一開始分析全橋CLLC諧振式轉換器的轉移函式，利用諧振電路的轉移函數來針對品質因數Q、電感比值k等電路參數分析對於增益的影響，並敘述傳統串聯諧振式轉換器的原理及比較。在控制方式方面，本論文使用變頻控制法針對充電模式下電池電壓在動態載時的穩壓度以及放電模式時開機的控制。其中CLLC諧振式轉換器的動作區間、轉移函式以及零電壓切換條件於論文中詳細描述。並模擬在變頻控制模式下電路增益的變化與其應力大小。在電路設計上使用諧振槽轉移函數的關係，規劃設計出一套流程圖，利用模擬及損耗評估來設計出合適的諧振槽參數。最終以實作證明理論分析，量測得最高效率為96.24%。

This thesis presents the development of a 4 kW maximum output power full-bridge CLLC resonant converter for use in bidirectional DC charging stations. The primary side of the grid operates at a voltage of 400 V, while the secondary side connected to the battery operates at voltages ranging from 42 V to 58 V. The full-bridge CLLC resonant converter is capable of delivering a rated output power of 4 kW. The paper begins by analyzing the transfer function of the full-bridge CLLC resonant converter. The impact of circuit parameters such as quality factor (Q) and inductance ratio (k) on the gain is investigated using the transfer function of the resonant circuit. The principles of the conventional series-resonant converter are also described. In terms of control strategy, the paper employs a variable frequency control method to regulate the battery voltage during charging mode and to control the start-up process during discharging mode. The operating range, transfer function, and Zero-Voltage switching conditions of the CLLC resonant converter are detailed in the paper. The variation of circuit gain and stress under variable frequency control mode is simulated and analyzed. For circuit design, a design flowchart is devised based on the relationship of the resonant tank transfer function. Simulation and loss evaluation are utilized to determine suitable parameters for the resonant tank. Finally, experimental results validate the theoretical analysis, with a maximum efficiency of 96.24% measured.

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