臺灣博碩士論文加值系統

　本論文提出一應用於非接觸電源供應器具無損耗緩振電路之順向-返馳式電源轉換器。為達到減少元件數量之目的，利用磁整合元件技術，將順向返馳式電源轉換器中之變壓器與輸出電感整合成一變壓器。此外，於順向返馳式電源轉換器中加入一緩振迴授網路，其緩振機制，除了可降低開關之切換損失及電壓應力，並可回收漏感之能量，以提昇轉換器之效率；其迴授機制，可提供控制IC一穩定的電源，並可達到穩壓之效果。
最後，實做一15W無損耗緩振電路之順向-返馳式電源轉換器的雛型電路，來觀測開關電壓、輸出電壓漣波與效率，以驗證其實用性。

關鍵字:非接觸電源供應器;隔離型迴授;無損耗緩振電路;磁整合元件;順向返馳式轉換器

This thesis presents a proposed forward-flyback converter with the snubber-feedback network for the contactless power supply applications. In order to reduce the component count and volume, the output inductor and transformer are integrated with the proposed magnetic integration technology. Since the contactless power supply has the low conversion efficiency and low load regulation, the snubber-feedback network is applied to overcome these drawbacks. In the snubber-feedback network, an auxiliary winding of the integrated transformer is utilized as both the magnetic-loop voltage feedback and the lossless snubber inductor.
A prototype circuit of the 15W forward-flyback power converter is built to verify the performances, such as load regulation, voltage stress on the power switch and efficiency, comparing with conventional one.

Keyword:contactless power supply,lossless snubber,integrated transformer,output-voltage sensing circuit,forward-flyback converter

CHAPTER 1. INTRODUCTION 1
1.1. BACKGROUND 1
1.2. MOTIVATION 2
1.3. OUTLINE OF THE THESIS 3
CHAPTER 2. FORWARD-FLYBACK CONVERTER WITH SNUBBER-FEEDBACK NETWORK 4
2.1. INTRODUCTION 4
2.2. PROPOSED FORWARD-FLYBACK CONVERTER 5
2.3. SNUBBER-FEEDBACK NETWORK 8
2.4. PROPOSED FORWARD-FLYBACK CONVERTER WITH SNUBBER-FEEDBACK NETWORK 10
2.5. SUMMARY 11
CHAPTER 3. ANALYSIS AND DESIGN OF FORWARD-FLYBACK CONVERTER WITH SNUBBER-FEEDBACK NETWORK 12
3.1. INTRODUCTION 12
3.2. OPERATIONAL PRINCIPLES 12
3.3. ANALYSIS AND DESIGN OF PROPOSED CIRCUIT TOPOLOGY 25
3.3.1. Proposed Forward -Flyback Converter 26
3.3.2. Output Voltage Ripple 36
3.3.3. Snubber-feedback Network 39
3.4. SUMMARY 42
CHAPTER 4. EXPERIMENTAL RESULTS 43
4.1. INTRODUCTION 43
4.2. IMPLEMENTATION OF PROPOSED CIRCUIT 43
4.3. EXPERIMENTAL RESULTS 45
4.4. SUMMARY 53
CHAPTER 5. CONCLUSIONS AND FUTURE WORKS 54
REFERENCES 56
APPENDIX A 59
APPENDIX B 60
APPENDIX C 70
APPENDIX D 76
VITA 77

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