臺灣博碩士論文加值系統

　　本論文討論不同型式具有功因校正的整合型交/直流轉換器，以及各式的無損耗緩震電路。並提出一新型具有功因校正的整合型交/直流轉換器以及整合型無損耗緩震電路。
　　本文所提出之架構將整合型順向式及返馳式電路以一後級調整器結合在一起，此整合型順向式及返馳式電路如同兩組子轉換器，共同分擔總輸出功率。為維持高輸入功因，返馳式電路輸送大部分的功率。具有快速響應的後級調整器可抑制電源頻率之漣波，使輸出電壓維持定值。因此所提出之電路具有快速之動態響應。因為本電路輸入端不需使用高壓儲能電容及電流偵測器，故在不連續導通模式下，本電路具有高輸入功因與低電源頻率漣波輸出。而輸入電壓可變動在一般標準的測試範圍(0.8~1.2標么)，故適合於家庭及工業上之應用。
　　為提升交/直流轉換器之效率，尤其是工作在不連續導通模式，一新式的整合型無損耗緩震電路在本文提出。利用多繞組變壓器，此無損耗緩震電路可與返馳式或本文提出之交/直流轉換器整合在一起，且不需外加鐵心、主動開關元件及其驅動器。因此本文所提出之電路具低成本與元件體積，其理論及實驗結果將在本論文中闡述。

　　In this dissertation, various integrated AC/DC converters with power factor correction and nondissipative snubber are discussed. A novel integrated AC/DC converter with power factor correction and line-frequency ripple suppression is proposed. And a novel nondissipative snubber integrated with AC/DC converters is also proposed.
　　The proposed topology combines an integrated flyback and forward circuits with a post regulator. The integrated flyback and forward circuits function as two sub-converters that share the total output power. To maintain a high power factor, the flyback circuit delivers the major output power. The post-regulator with fast response to suppress line-frequency ripple controls the output voltage in constant. Therefore the proposed circuit can result in a good performance with fast dynamic response. Without the use of high voltage bulk capacitor or current sensor, the circuit features high power factor and low output line-frequency ripple in discontinuous conduction mode. The input voltage can be varied over the standard testing range (0.8-1.2 p.u.), it is suitable for home or industrial applications.
　　To improve the efficiency of AC/DC converters, especially operating in discontinuous conduction mode, an integrated nondissipative snubber is proposed. By the use of a multi-winding transformer, the novel nondissipative snubber can be integrated with flyback or proposed AC/DC converters. No additional magnetic core, active switching and driver are needed for the proposed integrated nondissipative snubber. Therefore the proposed topology improves the efficiency without over-dimensioning of parts and with very low cost. The theoretical analysis and experimental results are presented.

CONTENTS I
LIST OF TABLES III
LIST OF FIGURES IV
CHAPTER 1. INTRODUCTION 1
1.1 Motivation 1
1.2 Organization 6
CHAPTER 2. INTEGRATED CONVERTERS WITH POWER FACTOR 8 CORRECTION
2.1 Conventional integrated PFC converters 8
2.1.1 Integrated PFC converter in cascade 8
2.1.2 Integrated PFC converter in parallel 15
2.2 Conventional flyback-forward converter 17
2.3 Proposed flyback-forward converter and the principle of operation 17
CHAPTER 3. ANALYSIS AND PERFORMANCE OF THE PROPOSED 21
FLYBACK-FORWARD CONVERTER
3.1 Power factor (PF) and total harmonics distortion (THD). 21
3.2 DCM and CCM boundary conditions 27
3.2.1 Flyback sub-converter 27
3.2.2 Forward sub-converter 28
3.3 Effects of the variation of input voltage 29 3.4 Design guidelines for main circuit components 29
3.4.1 Power switches and diodes 29
3.4.2 Capacitors 30
3.4.3 Magnetic components 33
3.5 Performance of the proposed flyback-forward converter 33
3.6 Summary 34
CHAPTER 4. INTEGRATED NONDISSIPATIVE SNUBBER 44
4.1 Introduction 44
4.2 Regenerative and nondissipative snubbers 47
4.3 Proposed topology of integrated nondissipative snubber 50
4.4 Analysis of the proposed integrated nondissipative snubber 56
4.5 Simulation and experimental results of the proposed integrated 66 nondissipative snubber
4.6 Summary 77
CHAPTER 5. CONCLUSIONS AND RECOMMENDATIONS 78
5.1 Conclusions 78
5.1 Recommendations 79
REFERENCES 80
LIST OF PUBLICATIONS 85

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