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研究生： 陳重佑
Chen, Chung-Yu
論文名稱： 具耦合電感及切換電容之電流饋入式高轉換比雙向直流-直流轉換器
Current-Fed High-Conversion-Ratio Bidirectional DC-to-DC Converter with Coupled-Inductors and Switched-Capacitors
指導教授： 楊宏澤
Yang, Hong-Tzer
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 85
中文關鍵詞： 雙向轉換器 、電流饋入 、高轉換比 、耦合電感 、切換電容
外文關鍵詞： Bidirectional Converter, Current-Fed, High-Conversion-Ratio, Coupled-Inductors, Switched-Capacitors
相關次數： 點閱：202  下載：7 
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    • 因為環境問題與負載需求持續上升，再生能源被廣泛運用。然而大部分的再生能源在併入現有電網時會有發電間歇性與不穩定性。為解決上述特性可能帶來的問題，儲能系統的加入不僅能提升電力供應穩定性並減少再生能源的發電間歇性。因此可用來調節儲能系統與電力系統能量傳輸的雙向直流-直流電能轉換器變成一個重要的研究議題。
    本論文研製一可應用於儲能系統之新型低壓側電流饋入型高電壓轉換比、高效率之雙向直流/直流電能轉換器。由於低壓側為電流饋入型，其低電流漣波的特性可省卻低壓側的電解電容，並增加整體系統可靠度。所研製電路透過耦合電感與切換式電容的技術來達到高電壓轉換比。於升壓模式，高壓側開關皆可柔性切換，有效減少切換損以提高整體效率；在降壓模式時，所有開關都可柔性切換，並透過主動箝位電路回收二次側漏感能量，進一步提升效率。
    本論文針對上述轉換器進行模式分析、元件應力以及相關參數設計，並實作一額定功率200W、低壓側電壓24V、高壓側電壓400V的雛型電路，以驗證本論文中所提之雙向電能轉換器之可行性。由實驗結果可知，此架構於升壓模式時最高轉換效率為95.5%，於滿載情況下為92.3%；降壓模式時最高轉換效率為93.2%，於滿載情況下為87.7%。

    Due to environmental consideration and increase of load demand, renewable energy is widely used nowadays. However, its unreliable and intermittent characteristics cause problems of power supply reliability. To solve the problem, an energy storage system (ESS) may be used not only to improve the stability of distribution power system with renewable energy integrated, but also relieve the intermittence of renewable energy. Therefore, used to coordinate power flow between ESS and distribution power system, a bidirectional DC-to-DC converter becomes an important research topic.
    A new current-fed high-conversion-ratio bidirectional DC-to-DC converter integrated coupled-inductors and switched-capacitors are proposed for the application in ESS. With the current-fed configuration, continuous low-ripple input current can be achieved, which can avoid the use of input electrolytic capacitor to enhance the reliability of the whole system. High-conversion-ratio is obtained by coupled-inductors and switched-capacitors. In boost mode, switches at high voltage side can achieve soft-switching. The efficiency can thus be enhanced due to the reduction of conduction loss. In buck mode, each of the switches can have soft-switching. Leakage energy on secondary side can be recycled by active-clamped circuit. Thus, the efficiency can be further improved as well.
    Operation principles, voltage stress analyses, and design guidelines of components used in the proposed circuit are discussed in detail in the thesis. Finally, a 24V low-side voltage, 400V high-side voltage, and 200W rated prototype power circuit has been implemented in the thesis to verify its effectiveness. According to the experimental results, a maximal efficiency 95.5% and 92.3% at rated power are obtained while in boost mode. In buck mode, a maximal efficiency 93.2% and 87.7% at rated power are observed.

    摘 要 I ABSTRACT II 致謝 IV LIST OF FIGURES VII LIST OF TABLES XII CHAPTER 1. INTRODUCTION 1 1.1. Backgrounds and Motivations 1 1.2. Review of References 2 1.3. Research Objectives and Contributions 4 1.4. Organization of the Thesis 4 CHAPTER 2. REVIEW OF BIDIRECTIONAL DC-to-DC CONVERTER 6 2.1. Conventional Converters 6 2.2. Review of High-Conversion-Ratio Bidirectional DC-to-DC Converters 7 2.2.1. Cascaded Type 7 2.2.2. Paralleled Type 8 2.2.3. With Voltage-Stacking 9 2.2.4. With Switched-Capacitors 10 2.2.5. With Coupled-Inductors 12 2.2.6. Cascaded Type with Coupled-Inductors 16 2.2.7. With Coupled-Inductors and Switched-Capacitors 17 2.2.8. Current-Fed Type with Coupled-Inductors and Voltage-Stacking 18 2.3. Summary 20 CHAPTER 3. PROPOSED DC-to-DC CONVERTER 21 3.1. Proposed Converter Configuration 21 3.2. Boost Mode 23 3.2.1. Operating Principles 25 3.2.2. Voltage Conversion Ratio 30 3.2.3. Boundary Condition 32 3.3. Buck Mode 33 3.3.1. Operating Principles 35 3.3.2. Voltage Conversion Ratio 39 3.3.3. Boundary Condition 41 3.4. Analysis and Design 43 3.4.1. Selection of Semiconductor Components 43 3.4.2. Design of Magnetizing Inductor in CCM 44 3.4.3. Design of Low Voltage Side Inductor 45 3.4.4. Capacitor Design 45 3.4.5. Comparisons 46 3.4.6. Control 48 3.5. Summary 50 CHAPTER 4. SIMULATED AND EXPERIMENTAL RESULTS 52 4.1. Specifications 52 4.2. Simulated and Experimental Verification 54 4.2.1. Boost Mode 55 4.2.2. Buck Mode 66 4.3. Comparison 76 4.4. Summary 79 CHAPTER 5. CONCLUSIONS 80 5.1. Summary 80 5.2. Future Works 81 REFERENCES 82

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