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研究生： 林瑋騰
Wei-Teng Lin
論文名稱： 不對稱推挽式電能轉換器
Asymmetrical Push-Pull Power Converters
指導教授： 呂錦山
Ching-Shan Leu
口試委員: 林瑞禮
Ray-Lee Lin
楊宗銘
Chung-Ming Young
林志毅
Jhih-Yi Lin
榮世良
Brady Jung
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： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 66
中文關鍵詞： 順向推挽式轉換器 、不對稱控制 、不對稱推挽式轉換器 、台灣科技轉換器 、零電壓切換 、低電流漣波
外文關鍵詞： current ripple reduction, asymmetrical control, asymmetrical push-pull converter, push-pull forward converter, Taiwan Tech converter, zero-voltage switching (ZVS)
相關次數： 點閱：330  下載：10 
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    • 順向推挽式轉換器已被廣泛的應用在中低功率電源上。然而，由於順向推挽式轉換器硬切式切換，造成較大的切換損失。這會間接影響整體效率及限制功率密度。
    而本篇將提出利用不對稱控制方式來達成零電壓並結合中間抽頭整流器的不對稱推挽式順向轉換器及結合順向式半波整流器和反馳式半波整流器的順向反馳式整流器提出不對稱推挽式順向反馳式轉換器。
    兩個轉換器除了繼承了順向推挽式轉換器的低輸入電流漣波之優點外他還實現零電壓切換，由其是在輕載。兩電路的操作原理，電路分析設計考量已經發表。最後，實現兩個硬體為輸入電壓300~400伏特、輸出電壓24伏特、輸入電流10安培和操作頻率在100kHz來驗證理論分析。

    Push-pull forward converter (PPF) has been widely used in low-to-medium power applications. However, it has large switching losses due to its hard-switching operation. It will impact the conversion efficiency and limit power density.
    Employing a center-tapped rectifier and a mixed forward half-wave rectifier and a flyback half-wave rectifier, two asymmetrical push-pull forward converters, an asymmetrical push-pull forward converter (APPF) and an asymmetrical push-pull forward-flyback converter (APPFF) are proposed and investigated in this thesis.
    In addition to having input ripple reduction inherits from its predecessor, zero voltage switching (ZVS) operation in both converters are achieved, especially in light load operating conditions.
    The operational principle, circuit analysis and design consideration are addressed. Finally, two hardware implementations with 300-400-V input, 24-V/10-A output, 100 kHz, are built to verify theoretical analysis.

    Abstract I Acknowledgements II Table of Contents III List of Figures V List of Tables VIII Chapter 1 Introduction 1 1.1 Background and motivation 1 1.2 Objectives of the Thesis 3 1.3 Organization of the Thesis 3 Chapter 2 Asymmetrical Push-Pull Forward Converter 5 2.1 Introduction 5 2.2 Operation principle 6 2.3 Circuit analysis 11 2.3.1 Voltage gain 11 2.3.2 Semiconductors voltage stress 12 2.3.3 Transformer DC-bias current 12 2.3.4 ZVS condition 13 2.4 Circuit design 15 2.4.1 Transformer 15 2.4.2 Output inductor 19 2.4.3 Output capacitor Co 21 2.4.4 Clamping capacitors Cc and Cr 22 2.4.5 Switches Q1 and Q2 23 2.4.6 Output rectifier diodes D1 and D2 23 2.5 Experimental results 24 2.5.1 Experimental results of the APPF 24 2.6 Summary 30 Chapter 3 Asymmetrical Push-Pull Forward-Flyback Converter 31 3.1 Introduction 31 3.2 Operation principle 32 3.3 Circuit analysis 37 3.3.1 Operating mode 37 3.3.2 Output current distribution ID1 and ID2 39 3.3.3 Transformer DC-bias current 40 3.3.4 ZVS condition 41 3.4 Circuit design 42 3.5 Experimental results 43 3.5.1 Experimental results of the APPFF 43 3.6 Summary 49 Chapter 4 Conclusion and Future Works 50 4.1 Conclusion 50 4.2 Future works 51 References 52

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