臺灣博碩士論文加值系統

本論文主要研製一台500W雙輸出轉換器，採用的架構為LLC形式串聯諧振轉換器。文中針對半橋諧振轉換器做電路分析，並使用MATLAB數學模擬軟體進行品質因數(Q)、K因子、特性阻抗(Zo)、變壓器圈數比(NP/NS)與一次測激磁電感(Lm)之響應模擬。串聯諧振轉換器在輕載雖然可以藉由提高切換頻率降低輸出增益，但如果考慮兩組輸出一輕一重的條件下，頻率變動勢必大受限制而影響輸出電壓調節率，所以本文採用雙諧振槽與雙變壓器的方式，分別設計各輸出變壓器的圈數比與諧振槽特性以滿足輸出電壓規格以外，本文亦藉由分析串並聯諧振特性，說明二次側繞組間之雜散電容及輸出整流二極體之接面電容對諧振轉換器的影響。
本論文提出一LLC設計流程，藉由設定諧振頻率及特性阻抗可計算出各元件之�屆C最後，實作一部12V/35A、5V/15A之雙輸出LLC，並將實測結果與模擬和理論相互印證。

This thesis focuses on the study and implementation of a 500W double-output LLC-type half-bridge series resonant converter (SRC). The basic operating principles of an SRC are discussed in detail. The relationships among the voltage gain, quality factor (Q), K factor, characteristic impedance (Zo), turns ratio (n) and magnetizing inductance (Lm) have been analyzed and simulated with MATLAB. Generally, the output voltage for a single-output SRC at light loads can be regulated by increasing the switching frequency. However, the output voltage regulations for a two-output circuit with only one resonant tank and one transformer are almost impossible due to the cross-regulation effects, especially when one output is at the heaviest load and the other at the lightest load. Therefore, two resonant tanks and two transformer have been used for each output in the proposed topology. Each resonant component and transformer can be separately designed to satisfy the ouput specification. In this thesis, a LLC-type SRC are analyzed and implemented to explain the influences of secondary parasitic capacitances and the junction capacitances of output rectifier diodes on the resonant circuit.

摘　要 i
Abstract ii
誌　謝 iii
目　錄 iv
符號索引 vi
圖表索引 viii
第一章 緒論 1
1.1 研究背景與動機 1
1.2 內文編排方式 2
第二章 串聯諧振轉換器原理 3
2.1 RLC串聯電路頻率響應分析 3
2.2 串聯諧振轉換器頻率響應分析 4
2.3 LLC串聯諧振轉換器頻率響應分析 6
2.3.1 Region-1之動作分析及數學模型 8
2.3.2 Region-2之動作分析與數學模型 16
第三章 輕載條件下電壓漂移現象之探討 23
3.1 串並聯諧振轉換器特性 23
3.2 雜散電容之影響 24
第四章 諧振槽之分析、模擬與設計 30
4.1 LLC串聯轉換器諧振槽分析 30
4.2 品質因數Q值及K因子對頻率響應的影響 31
4.3 特性阻抗Zo對頻率響應之影響 34
4.4 圈數比n對頻率響應的影響 35
4.5 LLC設計流程 36
4.5.1 制定規格 38
4.5.2 變壓器設計及製作 38
4.5.3 計算Lr、Lm及Cr之限制 39
4.5.4 選定Zo及計算Lr、Lm及Cr之值 40
4.6 雙輸出LLC設計範例 40
第五章 實驗結果 48
5.1 雙輸出電路實作規格 48
5.2 雙輸出電路實作結果與波形 50
第六章 結論 53
6.1 結論 53
6.2 未來研究方向 53
參考文獻 54

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