臺灣博碩士論文加值系統

本文主要探討低電壓輸出交流轉直流電源供應器與傳統電源供應器在於效率及電磁干擾之比較。本文利用零電壓轉移技術於功因修正器和同步整流技術取代傳統式電路。經電腦模擬及電路實驗證實該電路可有效提昇效率及改善電磁干擾。本文也另提出應用簡單及低成本可抑制EMI之其他方法。

In this paper, a low DC voltage output, soft-switched zero voltage transient (ZVT) boost power factor correction (PFC) with synchronous rectification (SR) AC-DC forward converter is presented. The simulation and experimental results are compared to show the efficiency and the electromagnetic interference (EMI) performance of the proposed converter is better than the conventional converter. Also some simple EMI solutions are introduced and verified in the closed loop converter.

Abstract in Chinese i
Abstract ii
Acknowledgements iii
Contents iv
List of Figures vi
Chapter 1 Introduction 1
1.1 MOTIVATION 1
1.2 REVIEW OF THE AC/DC FORWARD CONVERTER 1
1.2.1 Hard-switching AC/DC Forward Converter 1
1.2.2 Soft-switching AC/DC Forward Converter 2
1.2.3 Synchronous Rectifier application 2
1.3 REVIEW OF THE EMI FOR POWER CONVERTER 3
1.4 CONTRIBUTION OF THE THESIS 4
1.5 ORGANIZATION OF THE THESIS 4
Chapter 2 Conventional AC-DC Forward Converter 6
2.1 BLOCK DIAGRAM OF CONVENTIONAL AC-DC FORWARD CONVERTER 6
2.2 AC-DC BOOST PFC STAGE 7
2.3 DC/DC FORWARD CONVERTER STAGE 11
2.4 DISADVANTAGE OF CONVENTIONAL CONVERTER 12
2.5 SUMMARY 13
Chapter 3 Proposed AC/DC Forward Converter 14
3.1 INTRODUCTION OF THE PROPOSED AC/DC FORWARD CONVERTER 14
3.2 BOOST ZVT FOR PFC APPLICATIONS 16
3.2.1 Introduction to boost PFC 16
3.2.2 Advantage of Boost ZVT 17
3.2.3 Analysis of Boost ZVT Converter in Different Intervals 18
3.2.4 Drawback of the boost ZVT 25
3.3 SYNCHRONOUS RECTIFICATION APPLICATION 25
3.3.1 Introduction 25
3.3.2 Synchronous Rectification 26
3.3.3 Self-Driven Synchronous Rectification 27
3.3.4 Control Driven Synchronous Rectification 28
3.3.5 Proposed Synchronous Rectification 28
3.3.6 Drawback of Synchronous Rectification 30
3.4 SUMMARY 31
Chapter 4 EMI Mitigating Method 33
4.1 INTRODUCTION 33
4.2 REROUTE THE NOISE CURRENT LOOP 33
4.3 REDUCE THE PARASITIC EFFECT 34
4.4 REDUCE DV/DT ON THE SWITCH 35
4.5 CONDUCTED EMI MEASUREMENT 36
4.5 SUMMARY 40
Chapter 5 Experiment Confirmation of Proposed Converter 41
5.1 BOOST ZVT CONVERTER 41
5.1.1 Simulation Results of Boost ZVT Converter in Closed Loop 41
5.1.2 Experimental Results of Boost ZVT Converter in Closed Loop 42
5.1.3 Line Voltage and Current waveform. 43
5.1.4 Efficiency Comparison 44
5.1.5 EMI Comparison 45
5.2 SYNCHRONOUS RECTIFICATION 47
5.2.1 Conventional topology without SR 47
5.2.2 Simulation Results of Proposed Synchronous Rectification 50
5.2.3 Experimental Results of Proposed Synchronous Rectification 52
5.2.4 Gate drive signal of synchronous rectification 54
5.2.5 Efficiency Comparison 54
5.3 SUMMARY 55
Chapter 6 Conclusion and Future Researches 56
6.1 CONCLUSION 56
6.2 FUTURE RESEARCHES 56
References 58

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