臺灣博碩士論文加值系統

本論文提出一操作於臨界電流導通模式下的非反相降-昇壓型功率因數修正電源轉換器，可提供昇壓或降壓的正輸出電壓，俾以應用於寬輸入電壓範圍。由於傳統昇壓型功率因數修正電源轉換器，需保持高昇壓率以獲得高功率因數，造成其本身與後級電路的元件承受高電壓應力，增加成本。而非反相降-昇壓型功率因數修正電源轉換器具有昇壓或降壓的功能，可被利用來解決上述之電壓應力問題。為了有效地降低電源轉換器開關在高頻切換時所造成的導通損失，非反相降-昇壓型功率因數修正電源轉換器，將被操作於臨界電流導通模式，以使得開關達到零電流切換。
最後，本論文設計並完成一個輸出功率70W的雛型電路，並提供實驗結果，以驗證本論文提出之功率因數修正電源轉換器的性能與可行性。

This thesis presents a boundary-conduction-mode (BCM) non-inverting buck-boost based power-factor-correction (PFC) converter for the wide input-voltage-range applications. This proposed converter has the functionality of both step-up and step-down conversion to provide the positive DC output-voltage. In order to achieve high power factor, high step-up voltage-conversion-ratio of the conventional boost PFC converter is required but leads to high voltage stress and cost of the components for the PFC stage and the following DC-DC converter stage. To reduce the voltage stress, the non-inverting buck-boost PFC converter with the step-up and step-down conversion functionality is utilized. In order to reduce the switching-loss in high-frequency applications, the BCM current control for the power switch to achieve zero-current turn-on switching is required. Finally, this thesis presents the design and implementation of the 70-watt prototype circuit for the proposed PFC converter. The experimental results are provided to validate the performance and feasibility of the proposed circuit.

CHAPTER 1. INTRODUCTION 1
1.1. Background 1
1.2. Motivation 6
1.3. Thesis Outline 7
CHAPTER 2. WIDE INPUT-VOLTAGE-RANGE PFC CONVERTERS 8
2.1. Introduction 8
2.2. Boost DC-DC Converter for PFC Applications 8
2.3. DC-DC Converters for Wide Input-Voltage-Range PFC Applications 10
2.3.1. Continuous-Current Mode 10
2.3.2 Boundary-Current Mode 14
2.4 Summary 17
CHAPTER 3. PROPOSED BCM NON-INVERTING BUCK-BOOST PFC CONVERTER 18
3.1. Introduction 18
3.2. Proposed BCM Non-inverting Buck-Boost PFC Converter 19
3.2.1. Non-inverting Buck-Boost PFC Converter 19
3.2.2. Problem of Buck+Boost Mode with BCM 22
3.2.3. Proposed BCM Non-inverting Buck-Boost PFC Converter with Synchronous Constant On-Time Control Scheme 27
3.3. Power Factor Analysis for BCM Boost PFC Converter and Non-inverting Buck-Boost PFC Converter 31
3.4. Comparison Between Conventional BCM Boost and Proposed BCM Non-inverting Buck-Boost PFC Converter 44
3.4.1. Comparison of Circuit Topology 44
3.4.2. Comparison of Voltage Stress 45
3.4.3. Comparison of Cost 48
3.4.4. Comparison of Power Factor 48
3.4.5. Comparison of Efficiency 52
3.5. Summary 55
CHAPTER 4. IMPLEMENTATION AND EXPERIMENTAL RESULTS 56
4.1. Introduction 56
4.2. Implementation of the Proposed BCM Non-inverting Buck-Boost PFC Converter 56
4.2.1. Design and Analysis of the Inductance 56
4.2.2. Design and Analysis of the Cutoff Frequency for EMI Filter 61
4.2.3. Design and Analysis of the Output Capacitor 62
4.2.4. Implementation of the Prototype Circuit 63
4.3. Experimental Results for the Proposed BCM Non-inverting Buck-Boost PFC Converter 66
4.3.1. Measured Waveforms 66
4.3.2. Measured Efficiency 70
4.3.3. Measured Power Factor 71
4.3.4. Measured Input Harmonic Currents 72
4.4. Summary 73
CHAPTER 5. CONCLUSIONS AND FUTURE WORK 74
REFERENCES 76
APPENDIX A. MATHCAD? PROGRAM OF INPUT CURRENT, PF, AND THDI FUNCTION OF VOLTAGE-CONVERSION-RATIO 80
A.1. Input Current of BCM Boost PFC Converter 80
A.2. PF and THDi of BCM Boost PFC Converter 83
A.3. Input Current of BCM Non-inverting Buck-Boost PFC Converter 85
A.4. PF and THDi of BCM Non-inverting Buck-Boost PFC Converter 88
APPENDIX B. MEASURED EFFICIENCY WITH DIFFERENT OUTPUT POWER 90
VITA 91

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