本論文研製一個具有零電壓切換之主動箝位轉換器，利用主動箝位技術來取代傳統的洩磁繞組以及RCD被動箝位電路，並且可以將變壓器的激磁電感及漏電感的儲能再次的重複利用，以提高轉換器的效率，另一方面，主動箝位電路可以幫助主開關達到零電壓切換，以降低主功率開關的切換損失，並且，克服了工作週期不得高於50 %的限制。
同時為了提高效率，在輸出端採用導通電阻極低的MOSFET來做同步整流(synchronous rectifier，SR)，並且利用變壓器的二次側電壓來驅動MOSFET，降低驅動電路設計的複雜度。最後本文提出針對零電壓主動箝位與同步整流順向式與返馳式轉換器的設計，並實際設計交流輸入電壓90Vac~132Vac，直流輸出為5V/20A的交流對直流轉換器（AC/DC converter）。

The objective of this thesis is to design and implementation of Zero-Voltage-Switching Converter with Active-Clamp topology. The energy stored in the magnetizing and leakage inductance can be retrieved to improve the efficiency by the active-clamped circuit. On the other hand, the active-clamp circuit can help the main switch to be operated at zero voltage switch, in order to reduce the switching losses of main switch.
In order to increase the efficiency, a synchronous rectifier is adopted by using MOSFET with low Rds(ON) at the output end. The drive signal of synchronous rectifier switch is come from the transformer secondary side voltage in order to reduce the complexity of driven circuit designed.
Finally, the design of the zero-voltage-switch Forward and Flyback converters with active clamp reset and synchronous rectification are proposed. A design example of AC/DC converter, whose input range from 90Vac~132Vac and the output 5V/20A is presented.

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 --------------------------------------------------------------------------- xii
第一章 緒論--------------------------------------------------------------------- 1
1-1 前言--------------------------------------------------------------------- 1
1-2 章節概述--------------------------------------------------------------- 2
第二章 基本隔離與非隔離型轉換器--------------------------------------- 4
2-1 基本非隔離型轉換器(Non-isolated converter)-------------------- 4
2-2 基本隔離型轉換器(Isolated converter)---------------------------- 5
2-2-1 順向式轉換器連續導通模式之穩態分析------------------------ 6
2-2-2 返馳式轉換器連續導通模式之穩態分析------------------------ 12
第三章 主動箝位技術(Active Clamp)--------------------------------------- 18
3-1 硬式切換(Hard Switch)----------------------------------------------- 18
3-2 主動箝位電路(軟切)------------------------------------------------- 20
第四章 同步整流(Synchronous Rectifier)技術------------------------------ 21
第五 章 主動箝位與同步整流技術應用在順向式轉換器(FORWARD CONVERTER)--------------------------------------------------------- 22
5-1 基本架構說明--------------------------------------------------------- 22
5-2 電路動作分析--------------------------------------------------------- 23
5-2-1 Mode-1 : [t0~t1]-------------------------------------------------------- 24
5-2-2 Mode-2 : [t1~t2]-------------------------------------------------------- 25
5-2-3 Mode-3 : [t2~t3]-------------------------------------------------------- 27
5-2-4 Mode-4 : [t3~t4]-------------------------------------------------------- 29
5-2-5 Mode-5 : [t4~t5]-------------------------------------------------------- 31
5-2-6 Mode-6 : [t5~t6]-------------------------------------------------------- 33
5-2-7 Mode-7 : [t6~t7]-------------------------------------------------------- 35
5-2-8 Mode-8 : [t7~t8]-------------------------------------------------------- 37
5-2-9 Mode-9 : [t8~t9] ------------------------------------------------------- 39
5-2-10 Mode-10 : [t9~t0] ------------------------------------------------------ 40
5-3 實驗波形(所有圖檔於110V輸入，100W輸出量測)---------- 42
5-4 實驗數據--------------------------------------------------------------- 53
5-4-1 硬式切換不同輸入電壓效率分析--------------------------------- 53
5-4-2 軟切，輸出為二極體整流，不同輸入電壓效率分析------------ 54
5-4-3 軟切，輸出為同步整流，不同電壓效率分析--------------------- 55
第六章 主動箝位與同步整流技術應用在返馳式轉換器(FLY-BACK CONVERTER)--------------------------------------------------------- 58
6-1 基本架構說明--------------------------------------------------------- 58
6-2 電路動作分析--------------------------------------------------------- 59
6-2-1 Mode-1 : [t0~t1]-------------------------------------------------------- 60
6-2-2 Mode-2 : [t1~t2]-------------------------------------------------------- 61
6-2-3 Mode-3 : [t2~t3]-------------------------------------------------------- 63
6-2-4 Mode-4 : [t3~t4]-------------------------------------------------------- 65
6-2-5 Mode-5 : [t4~t5]-------------------------------------------------------- 67
6-2-6 Mode-6 : [t5~t6]-------------------------------------------------------- 69
6-2-7 Mode-7 : [t6~t7]-------------------------------------------------------- 70
6-3 實驗波形(所有圖檔於110V輸入，100W輸出量測)---------- 71
6-4 實驗數據--------------------------------------------------------------- 81
6-4-1 硬式切換不同輸入電壓效率分析--------------------------------- 81
6-4-2 軟切，輸出為二極體整流，不同輸入電壓效率分析------------ 82
6-4-3 軟切，輸出為同步整流，不同電壓效率分析--------------------- 83
第七章 結論--------------------------------------------------------------------- 86
參考文獻 --------------------------------------------------------------------------- 87
附錄A 實作硬體電路實體照片--------------------------------------------- 91
自傳 --------------------------------------------------------------------------- 92

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