臺灣博碩士論文加值系統

本論文提出LLC諧振轉換器在高輸入電壓之應用，此架構由兩組半橋LLC諧振轉換器串聯所構成，該轉換器具有功率開關零電壓導通，整流二極體零電流截止及兩個輸入串聯電解電容自動平衡之特點。對於高壓輸入之應用，採取了串聯連接輸入電容及外加飛輪電容之方式，將功率開關之電壓應力限制於輸入電壓的一半。根據諧振槽之設計原理及變頻控制，功率開關及整流二極體實現零電壓導通和零電流截止之功能，使開關切換損失及整流二極體的逆向恢復電流皆大幅減少，並且得到穩定之輸出電壓。最後，本論文將針對所提出的轉換器作詳述的電路分析及設計，並提出電路實驗結果來驗證其有效性。

This thesis presents a new LLC resonant converter with two series half-bridge circuits for high voltage applications. The features of the proposed converter are zero voltage switching (ZVS) turn-on for all active switches, zero current switching (ZCS) turn-off for all output rectifier diodes and automatically balanced voltage in each split capacitors. Two half-bridge converters connected in series, two split capacitors and one flying capacitor are adopted in order to limit the voltage stress of each power switch at one-half of input voltage. The variable frequency PWM is adapted in proposed converter to regulate the output voltage. Due to the selected switching frequency is less than the series resonant frequency, all power switches can be turned on at ZVS and rectifier diodes can be turn off at ZCS. Thus, the switching losses of active switches and the reverse recovery losses of rectifier diodes are eliminated. Finally, experiments are provided to verify the effectiveness of the proposed converter.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 x
第一章 緒論
1.1 研究背景與動機 1
1.2 研究內容 3
1.3 論文大綱 3
第二章 柔切技術與諧振電源轉換器
2.1 柔切技術 4
2.2 諧振電源轉換器 6
2.2.1 準諧振轉換器 6
2.2.2 半橋諧振轉換器 8
第三章 新型LLC諧振電源轉換器
3.1 主電路架構 17
3.2 電壓增益曲線圖 19
3.3 電路狀態分析 27
第四章 新型LLC諧振電源轉換器之電路設計
4.1 電路參數設計 41
4.1.1 諧振元件設計 41
4.1.2 諧振元件的耐壓與耐流45
4.1.3 功率開關選定 46
4.1.4 輸出整流二極體選定 47
4.1.5 變壓器參數設計 47
4.2 功率損耗分析 50
4.2.1 功率開關之切換損失 50
4.2.2 電路元件導通損失 51
4.2.3 變壓器損失 52
4.2.4 功率損耗預估與比較 52
4.3 控制IC介紹 54
第五章 新型LLC諧振電源轉換器實驗結果
5.1 轉換器實際規格與參數 56
5.2 實驗結果波形圖 58
第六章 結論與未來研究方向
6.1 結論 76
6.2 未來研究方向 76
參考文獻 77

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