低輸入電流漣波之主動箝位型順向式轉換器｜國立臺灣科技大學博碩士論文系統

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研究生：	劉政佳 Cheng-Chia Liu
論文名稱：	低輸入電流漣波之主動箝位型順向式轉換器 Active-Clamp Forward Converter with Current Ripple Reduction
指導教授：	呂錦山 Ching-Shan Leu
口試委員:	王金標 Jin-Biao Wang 黃仲欽 Jong-Chin Hwang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	87
中文關鍵詞：	電流連波降低、電磁干擾、主動型箝位、順向式轉換器、同步整流
外文關鍵詞：	synchronous rectification, current ripple reduction, EMI, Active-Clamp, forward converter
相關次數：	點閱：362 下載：13
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上一筆

本文提出具有低輸入電流漣波之主動箝位型順向式轉換器(ACFRR)。此轉換器有較低的輸入電流連波和開關責任週期能操作大於50%，並且其輸入電流波形的基本成分強度可透過電路本身與嵌入式濾波器的設計而被衰減。
本文除介紹此轉換器之架構與工作原理，並以開關切換頻率為150 kHz、輸入36-75V、輸出5V/30A之規格，進行電路模擬與實驗來驗證其可行性而且此轉換器之最高效率為84.88%。
此外，在加入同步整流技術後，其轉換效率還能更進一步的改善。根據實驗結果，具同步整流之低輸入電流漣波主動箝位型順向式轉換器的最高效率可達到86.69%。

A novel low input-current ripple topology named Active-Clamp Forward
Converter with Current Ripple Reduction (ACFRR) is proposed in this thesis. In
addition to having lower input current ripple and more than 50% duty cycle operation,
the fundamental component intensity of the ACFRR’s input current waveform can be
reduced by designing the circuit with its embedded filter.
To demonstrate ACFRR’s feasibility, the operational principle, simulation and
experimental results of the proposed converter operated at 150 kHz switching
frequency, 36-75V input and 5V/30A output are presented and its highest efficiency
is 84.88%.
Moreover, the conversion efficiency of the ACFRR can be further improved by
applying the synchronous rectification. According to the experimental results, the
highest efficiency, 86.69% of the synchronous rectification ACFRR is achieved.

Table of Contents
Abstract………………………………………………………………………..….....I
Acknowledgements……………………………………………………………….…II
Table of Contents…………………………………………………………………...Ⅲ
List of Figures………………………………………………………………………Ⅴ
List of Table………………………………………………………………………. Ⅷ
Chapter 1 Introduction……………………………………..………………………1
1.1 Background and Motivation…………………………..………………….....1
1.2 Objective of the Thesis…………………………………………………...…3
1.3 Organization of the Thesis……………………………………..…………....4
Chapter 2 Active-Clamp Forward Converter with Current Ripple Reduction
(ACFRR)…………………………………………………………………6
2.1 Introduction………………………………………………………….............6
2.2 Operational Principle......................................................................................7
2.3 Circuit Analysis………………….................................................................11
2.4 Circuit Design……........................................................................................15
2.5 Simulation Results (SIMetrix/SIMPLIS)………………………..………….21
2.6 Experimental Results……………………......................................................24
2.7 Characteristic Comparisons of the FAC, the FRR and the ACFRR………...28
2.8 Summary……………………………………………………........................37
Chapter 3 ACFRR Circuit Variations for Efficiency Improvement……………..38
3.1 Introduction…………………………..…………………………………......38
3.2 ACFRR Circuit Variations Introduction.........................................................38
3.3 Power Loss Improvement Estimation………………..……………..............40
3.4 Efficiency Improvement by Employing Synchronous Rectification…..........44
3.5 Experimental Results……….........................................................................49
3.6 Summary……………………………………………………........................51
Chapter 4 Conclusions and Future Research……………………………………..52
4.1 Conclusions....................................................................................................52
4.2 Future Research………………………..……………………………….…...53
References...................................................................................................................54
Appendix A1…...…………………………………………………………………….58
Appendix B1…...…………………………………………………………………….61
Appendix B2…...…………………………………………………………………….65
Appendix B3…...…………………………………………………………………….69
Vita……………………………………………………………………….…………..75

                                

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