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研究生： 許世和
Hsu, Shih-Ho
論文名稱： 具效率提升機制之自激返馳式轉換器研製
Design and Implementation of Self-Oscillating Flyback Converter with Efficiency-Enhancement Mechanisms
指導教授： 林瑞禮
Lin, Ray-Lee
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： 2013
畢業學年度： 102
語文別： 英文
論文頁數： 71
中文關鍵詞： 自激返馳式轉換器 、無損耗緩振電路 、共模電壓 、間歇模式 、能量回收 、空載損耗
外文關鍵詞： self-oscillating flyback converter, lossless snubber, common mode voltage, burst mode, energy recovery, no-load power requirement
相關次數： 點閱：140  下載：3 
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    • 本論文提出一具間歇模式與多重能量回收機制之自激返馳式轉換器。
    因傳統具RCD緩振電路之自激返馳式轉換器有低效率、高空載功耗的缺點。更者，為了符合IEC62684規範的共模電壓限制，將變壓器一、二次側繞組間的寄生電容降低，但其缺點為變壓器的漏感增加。變壓器漏感的增加造成其所儲存的能量增加，在開關截止瞬間產生高壓突波，導致開關電壓應力上升。
    因此加入無損耗緩振電路來降低開關電壓應力與提高轉換效率。為了提升更多轉換效率的缺點，在自激返馳式轉換器加入能量回收繞組來回收閘極-源極電容所釋放的能量。更者，利用間歇控制機制來降低空載和輕載的功耗。
    最後，實做一7.5 W的具間歇模式與多重能量回收機制之自激返馳式轉換器，以驗證本論文所提出之電路特性，諸如減少共模電壓、降低開關電壓應力、提升轉換效率、降低空載損耗等。

    This thesis presents a self-oscillating flyback converter with efficiency enhancement mechanisms using lossless snubber and the energy recovery winding.
    The conventional self-oscillating flyback converter with RCD snubber has the issues of low conversion efficiency and high no-load power loss. Furthermore, in order to fulfill the 95Vp-p voltage limitation of IEC62684 common mode (CM) Standard, the parasitic capacitor of a transformer between the primary and secondary windings has to be reduced, which leads to large leakage inductance for the transformer. However, the larger leakage inductance stores more energy to cause the high voltage spike on the main switch during the turn-off transition period.
    Therefore, the lossless snubber is employed to suppress the voltage spike and increase the conversion efficiency. In order to increase more conversion efficiency, the energy recovery winding is employed to recycle the energy discharged from the gate-source capacitor of the main switch. Furthermore, the burst mode control mechanism is utilized to reduce the power consumption at the no-load and light-load conditions.
    Finally, a prototype circuit of the 7.5W self-oscillating flyback converter with efficiency enhancement mechanisms is built to verify the performances, such as the common mode voltage, the voltage stress on the switch, the conversion efficiency, and the no-load power loss.

    CHAPTER 1. INTRODUCTION 1 1.1. Background 1 1.2. Motivation 7 1.3. Thesis Outline 8 CHAPTER 2. EMPLOYED SELF-OSCILLATING FLYBACK CONVERTER 9 2.1. Introduction 9 2.2. Influence of Transformers Parasitic Capacitor on Common Mode Voltage 9 2.3. Employed Self-Oscillating Flyback Converter 13 2.3.1. Lossless Snubber Circuit 13 2.3.2. Energy Recovery Winding 14 2.3.3. Burst Mode Control Mechanism 15 2.4. Summary 18 CHAPTER 3. DESIGN OF EMPLOYED SELF-OSCILLATING FLYBACK CONVERTER 19 3.1. Introduction 19 3.2. Operational Principles 19 3.3. Design Guidelines 40 3.4. Summary 50 CHAPTER 4. IMPLEMENTATION AND EXPERIMENTAL RESULTS 51 4.1. Introduction 51 4.2. Implementation of Prototype Circuit 51 4.3. Experimental Results 52 4.4. Summary 61 CHAPTER 5. CONCLUSIONS AND FUTURE WORKS 62 REFERENCES 64 APPENDIX A 67 APPENDIX B 68 APPENDIX C 70 VITA 71

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