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研究生:李明輝
研究生(外文):Ming-Hui Li
論文名稱:應用於再生能源系統之高效率昇壓型直流-直流轉換器
論文名稱(外文):High-Efficiency Step-Up DC/DC Converter for Renewable Energy Power Applications
指導教授:呂錦山呂錦山引用關係
指導教授(外文):Ching-Shan Leu
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:英文
論文頁數:83
中文關鍵詞:電流前饋昇壓轉換器無損緩衝器低輸出電流連波
外文關鍵詞:current-fedboost converterlossless snubbercurrent ripple reductioncurrent ripple cancellation
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由於地球的暖化以及利用石油能源所帶來的種種問題,所以尋找無汙染可替代性能源及發展高效率的能源轉換系統已經是時勢所趨。 燃料電池和太陽能電池於未來是被考慮為最具有發展性的新能源之一。
但是,燃料電池和太陽能電池所產生的輸出電壓低並且變化範圍大所以無法直接提供一般電器使用。 因此,需要一級高昇壓比轉換器將低電壓提升至穩定的高壓(200V or 400V)輸出。
在各式的昇壓電路中,由於燃料電池和太陽能電池具有高輸出阻抗的特性,所以電流前饋式電路拓普較適合做為燃料電池和太陽能電池的昇壓電路。 再著,電流前饋式電路拓普還具有連續性的輸入電流、不需輸出電感且以較小變壓器匝比提供較大的電壓增益…等優點。
變壓器二次側通常需要全波整流電路和一級濾波器以產生穩定的高電壓輸出,但也就伴隨著以下的問題。
一、 變壓器二次側漏感上的能量會造成整流二極體有較高的電壓突波。
二、 無輸出濾波電感,因此會有較大的輸出電流漣波。
因此,通常都會在二極體上加入RC緩衝電路抑制電壓突波,增加輸出電容的數量以降低電流漣波,但也降低了轉換器效率及功率密度。
為了降低上述缺點所帶來的影響,本文提出兩種新式全波整流電路1.低輸出電流漣波之全波整流電路2.無輸出電流漣波之全波整流電路。
這兩種新式全波整流電路皆具有能吸收變壓器漏感的能量以降低二極體上電壓突波、低輸出電流漣波以減少輸出電容個數提昇功率密度…等優點。
應用這兩種新式整流電路,除了理論分析並實作驗證於低輸出電流漣波之昇壓轉換器(BCRR)、雙輸入電感低輸出電流漣波之昇壓轉換器(DI-BCRR)、雙輸入電感無輸出電流漣波之昇壓轉換器(DI-BCRC),操作在開關頻率150 kHz、輸出電壓24V~34V,200V、600瓦輸出的規格上。
Developing a clean, high efficiency alternative energy power system has become an urgent matter. Fuel cells and photovoltaic solar cells are considered two of the alternative energy sources for the future. However, both fuel cell and solar cell produce wide-range low DC output voltage and cannot directly support AC or DC electrical appliances. Therefore, this necessitates a step-up converter.
Among various step-up converter topologies, current-fed configuration is more suitably than voltage-fed configuration due to high output impedance of these cells. Furthermore, current-fed configuration has a non-pulsating input current, no output inductor, and a smaller turns-ratio in the high voltage transformer design.
However, a full-wave rectification circuit and filter circuit are essentially required on the secondary side of the transformer to generate high DC output voltage. Two key issues of concern have to be dealt with in these two stages.
1. Employing center-tapped or bridge-type rectification circuit, there is a voltage spikes caused by transformer leakage inductance resulting in using high voltage-rating rectifier diode.
2. The output current suffers from high current ripple due to the absence of an output inductor.
Consequently, turn-off snubber circuit, and larger output capacitor are needed. These components decrease converter efficiency and power density.
To alleviate these two problems, two rectification circuits: a full-wave rectification circuit with output current ripple reduction and a full-wave rectification circuit with output current ripple cancellation, are proposed in this thesis. Both circuits feature minimum of the voltage spike on the rectifier diode and small current ripple of the output capacitor.
Applying the proposed rectification circuits, three converters, a boost converter with output current ripple reduction (BCRR), a dual-inductor boost converter with output current ripple reduction (DI-BCRR), and a dual-inductor boost converter with output current ripple reduction (DI-BCRC), are presented. In addition to the description of the operation principle, theoretical analysis, and design considerations, circuits are implemented and tested with 150 kHz, 24-34V input and 200V/600W output specifications.
Abstract.........Ⅰ
Acknowledgements.........Ⅲ
Table of Contents.........Ⅳ
List of Figures.........Ⅵ
List of Tables.........Ⅸ
Chapter 1 Introduction.........1
1.1 Background and Motivation.........1
1.2 Objectives of the Thesis.........3
1.3 Organization of the Thesis.........4
Chapter 2 Boost Converter with Output Current Ripple Reduction (BCRR).........5
2.1 Introduction.........5
2.2 Operational Principle.........7
2.3 Circuit Analysis.........11
2.4 Comparisons of the BCRR and CF-CT.........16
2.5 Circuit Design .........19
2.6 Simulation Results.........23
2.7 Experimental Results.........27
2.8 Dual inductor boost converter with output current ripple reduction (DI-BCRR).........32
2.8.1 Operational Principle......... 32
2.8.2 The main features of the DI-BCRR.........34
2.8.3 Experimental Results.........35
2.9 Summary.........37
Chapter 3 Dual Inductor Boost Converter with Output Current Ripple Cancellation (DI-BCRC).........39
3.1 Introduction.........39
3.2 Operational Principle.........41
3.3 Circuit Analysis.........46
3.4 Simulation Results.........48
3.5 Experimental Results.........49
3.6 Summary.........54
Chapter 4 Conclusions and Future Researches.........55
4.1 Conclusions.........55
4.2 Future Researches.........56
Reference .........57
Appendix.........62
Vita.........73
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