臺灣博碩士論文加值系統

本論文旨在發展全橋直流-直流轉換器之脈波寬度調變技術。本論文提出適用於全橋直流-直流轉換器的切換控制技術以達成減少待機及輕載損耗以及一種考量效率並且可降低諧波強度的新型隨機脈波寬度調變技術。首先，利用狀態空間平均法建立連續時間下的全橋直流-直流轉換器數學模型，並藉由電路小訊號模型，設計控制器並以FPGA系統實現數位化控制之全橋直流-直流轉換器。其次，本文分析相移控制之全橋直流-直流轉換器的零電壓切換條件及全橋直流-直流轉換器在傳統脈波寬度控制及相移控制下的功率損耗。並且由分析的結果發展出一種新型切換控制技術，以改善待機及輕載損耗，再以實測結果驗證理論分析。
最後，本文提出一隨機脈波寬度調變技術以改善全橋直流-直流轉換器造成的諧波，其中並考量對於效率之影響，利用pseudo隨機程序產生器改變切換頻率，藉此有效的打散伴隨高頻切換造成之高頻諧波，並由模擬及實驗結果驗證此技術之有效性。

The main theme of this dissertation is to develop PWM control techniques for full-bridge DC/DC converter. A new switching control technique that can improve light load and standby power losses of phase-shift controlled full-bridge DC/DC converter is proposed. Furthermore, a new random PWM control technique is proposed to reduce the harmonics intensity while considering the efficiency. First, the continuous time-domain model of full-bridge DC/DC converter is established by state space average method. Based on the converter model, the digital controller is designed and implemented by an FPGA system. After that, ZVS condition for phase-shift control method and power losses for full-bridge DC/DC converter with PWM and phase-shift control are analyzed. According to the analyzed results, a switching control technique is developed to improve light load and stand by power losses. The results are verified by experimental results.
Finally, a new random PWM technique is presented. The proposed technique can reduce the harmonic intensity of full-bridge DC/DC converter while considering the efficiency. The proposed method uses pseudo random binary sequence generator to generate random bits to change switching frequencies to effectively spread the dominate harmonics. The effectiveness of the proposed techniques is verified by both simulation and experimental results.

ABSTRACT i
摘 要 iii
誌 謝 iv
Table of Contents v
List of Illustrations viii
List of Tables xv
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Literature Survey 2
1.2.1 Full-Bridge DC/DC Converter with Phase-Shift Control 2
1.2.2 PWM Techniques for Full-Bridge DC/DC Converter 5
1.3 Objectives and Contributions 6
1.4 Organization 7
Chapter 2 Modeling of Full-Bridge DC/DC Converter 8
2.1 Operation Principle 8
2.1.1 PWM Controlled Full-Bridge DC/DC Converter 8
2.1.2 Phase-Shift Controlled Full-Bridge DC/DC Converter 12
2.1.2.1 Analysis of Zero-Voltage-Switching (ZVS) Characteristics 17
2.1.2.2 Analysis of Circulating Current 19
2.2 Modeling of PWM Controlled Full-Bridge DC/DC Converter 21
2.3 Modeling of Phase-Shift Controlled Full-Bridge DC/DC Converter 27
2.4 Summary 32
Chapter 3 Switching Control Technique of Full-Bridge DC/DC Converter 33
3.1 Switching Loss Analysis of Phase-Shift Controlled Full-Bridge DC/DC Converter 34
3.2 Proposed Switching Control Technique 39
3.2.1 Switching Control Technique 39
3.2.2 Transition among Proposed Switching Control Modes 42
3.2.3 Loss Analysis of Proposed Switching Control Technique 44
3.3 Simulation and Experimental Results 46
3.4 Summary 55
Chapter 4 Random PWM Technique for Full-Bridge DC/DC Converter with Harmonic Intensity Reduction and Considering Efficiency 57
4.1 Prior Arts of Random PWM Techniques 58
4.1.1 Conventional PWM Switching Technique 58
4.1.2 Random Carrier Frequency 60
4.1.3 Constant Carrier Frequency 61
4.2 Test Bench of Full-Bridge Converter 64
4.3 Survey on PWM Switching Techniques 66
4.3.1 Description of Switching Techniques 66
4.3.2 Circulating Loss Analysis of PWM Techniques 70
4.3.3 Experimental Evaluation of PWM Techniques 72
4.4 Proposed Random PWM Technique 78
4.4.1 Proposed New Random PWM Technique 78
4.4.2 Pseudo Random Binary Sequence Generator 82
4.4.3 Analysis of Harmonic Characteristics of PWM Techniques 83
4.4.4 Experimental Evaluation of Proposed New Random PWM Technique 87
4.5 Summary 93
Chapter 5 Conclusions and Further Studies 94
5.1 Conclusions 94
5.2 Further Studies 95
References 97
Appendix I Agilent 4395A Test Set Up 103
Nomenclature 104
Vita 107
Publication List 108

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