臺灣博碩士論文加值系統

本論文介紹串聯諧振式轉換器(Series Resonant Converter，簡稱SRC)與LLC型式串聯諧振式轉換器(LLC-Type Series Resonant Converter，簡稱LLC SRC)的理論基礎及動作狀態分析，並分析各動作區間之等效電路，與推導串聯諧振轉換器各區間動作之數學模型。本論文同時針對全橋LLC串聯諧振式轉換器進行電路分析，並使用MATLAB數學模擬軟體完成品質因數(Q)、K因子、特性阻抗(Zo)、變壓器圈數比(NP/NS)與一次側激磁電感(Lm)之響應模擬。
本論文研製一台雙變壓器全橋LLC形式串聯諧振轉換器，此架構之優點為變壓器可均分輸出負載電流，分散變壓器體積，並易於實現電源供應器高功率密度之要求，藉由設定諧振頻率及特性阻抗，可計算出各元件之値。最後實作一台輸出規格為12V/42A之雙變壓器全橋LLC串聯諧振式轉換器，除了將實測結果和理論相互印證之外，並研擬未來研究方向。

This thesis focuses on the analysis of basic theories and operating modes of a series resonant converter (SRC) and an LLC-type SRC. The equivalent circuits and their mathematical models for each operation modes are also discussed. The main focus is on analyzing a full-bridge LLC-type SRC. MATLAB simulations are performed to observe the influences of the quality factor (Q), the K factor, the characteristics impedance (Zo), the transformer turns-ratio (Np/Ns), and the primary magnetizing inductance Lm on the frequency response of the voltage gain.
A two-transformer full-bridge LLC-type SRC prototype is implemented. The advantages of this topology are the inherent load current sharing, reduced transformer sizes, and feasible for high power density requirement. From the specified resonant frequency and characteristics impedance, the circuit components can be calculated. Lastly, a two-transformer LLC-type SRC with an output voltage of 12 V and an output current of 42 A is realized. Theoretical analyses are verified with the experimental results. Also future works for this research are included.

摘要 I
Abstract II
誌謝 III
目錄 IV
圖表索引 VI
第一章 緖論 1
1.1研究背景 1
1.2研究內容 3
1.3章節大綱介紹 3
第二章 串聯諧振式轉換器原理與簡介 5
2.1理想R-L-C串聯電路的頻率響應分析 5
2.2零電壓切換與零電流切換 7
2.3串聯諧振式轉換器 8
2.4 LLC串聯諧振式轉換器 10
2.5 SRC與LLC SRC之比較 14
第三章 全橋串聯諧振式轉換器 17
3.1主架構動作狀態分析 17
3.1.1第一能量傳送區間： 19
3.1.2第一諧振區間： 21
3.1.3第一換向區間： 22
3.1.4第二能量傳送區間： 24
3.1.5第二諧振區間： 25
3.1.6第二換向區間： 27
3.2 LLC串聯諧振轉換器在Region-2之動作分析及數學模型 28
3.2.1第一暫態區間： 29
3.2.2能量傳送區間： 31
3.2.3第二暫態區間： 32
3.2.4零電壓切換區間： 34
第四章 諧振槽之分析與模擬 36
4.1串聯諧振式轉換器諧振槽分析 36
4.1.1品質因數Q值對頻率響應的影響 37
4.1.2 K值對頻率響應的影響 39
4.1.3特性阻抗Zo對頻率響應的影響 41
4.1.4圈數比n值對頻率響應的影響 42
4.2雙變壓器串聯諧振式轉換器諧振槽分析 44
第五章 設計考量與設計實例 46
5.1電路參數設計 46
5.1.1切換電晶體選擇 46
5.1.2 LC諧振槽設計考量 47
5.1.3輸出整流濾波電路設計 49
5.1.4變壓器設計 51
第六章 實驗波形與數據 54
6.1實驗波形 54
6.2實驗數據 62
第七章 總結與未來展望 63
7.1總結 63
7.2未來研究方向 63
參考文獻 65

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