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研究生： 翁翠璜
Weng, Tsui-Huang
論文名稱： 新型主動式柔切暨升壓緩震器應用於高升壓直流-直流轉換電路
A Novel Step-Up Active Soft-Switching Snubber for High Voltage Gain DC-DC Converter Applications
指導教授： 楊宏澤
Yang, Hong-Tzer
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 90
中文關鍵詞： 耦合電感升壓電路 、高升壓 、零逆向回復電流 、柔切 、緩震電路
外文關鍵詞： coupled-inductor boost converter, high step-up, no reverse recovery current, snubber
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    • 本文提出在傳統的耦合電感升壓電路架構中，加入一新型主動式柔切暨升壓緩震器，結合諧振的技術以達到柔切效果，且可藉由調整緩震器變壓器匝比以達到額外的升壓效果，也使輔助開關達到零電流導通及截止時達到電壓箝位的功能。所提輔助緩震器能讓所有開關電流於切換時等於或接近於零，以及電路中的所有二極體因能達到自然截止，而不會產生逆向回復電流的問題。所使用之諧振技術不僅抑制所有開關的切換損失且回收漏感能量，以升壓至輸出端。本電路架構可選擇較小電壓應力之功率開關以期具較低的導通損失。相較於傳統的耦合電感的升壓電路，本文提升電壓轉換比。本文透過PSIM模擬及電路實作實現輸入電壓25~40V、輸出電壓400V且額定為250W之電路架構，且透過模擬及實作結果驗證所提轉換器之理論與可行性。

    In the traditional step-up boost converter with coupled inductor, a novel snubber design is proposed in this thesis to have additional step-up gain via different turns ratios and SS functions via resonant technique. Not only can main switch have the ZVS function, but also auxiliary switch is turned on under ZCS condition and turned off with voltage clamped. Therefore, the proposed snubber can achieve the current through or voltage across the power devices to be equal to or near zero during switching time, and there are no reverse recovery current within all the diodes, which achieve ZCS turn-off condition in proposed topology. Moreover, by using resonant technique in proposed topology, not only switching losses can be reduced on the power switches, which can select low-voltage low-conduction-loss power devices, but also the leakage energy can be recycled to step-up to the output terminal. Thus, the proposed topology can promote the voltage gain compared with the conventional coupled-inductor boost converter. Via PSIM simulations and experiments, a 250W, 30V input-voltage and 400V output-voltage prototype is implemented and verified effectiveness of the proposed converter in the thesis.

    摘要...i ABSTRACT...ii 誌謝...iii Table of Contents...iv List of Figures...vii List of Tables...xi List of Symbols...xii Chapter 1. INTRODUCTION...1 1.1 Backgrounds and Motivations...1 1.2 Literature Review...2 1.3 Research Method...4 1.4 Contributions of the Thesis...5 1.5 Organization of the Thesis...7 Chapter 2. REVIEW OF AUXILIARY SNUBBERS AND HIGH STEP-UP CONVERTERS...8 2.1 Introduction...8 2.2 Existing Auxiliary Snubbers...10 2.2.1 Passive Snubbers...10 2.2.2 Active Snubbers...11 2.3 Existing Step-Up Converters...17 2.3.1 Extended from conventional converter...17 2.3.2 Types of Step-Up Converters...18 2.4 Summary...24 Chapter 3. THE PROPOSED DC-DC CONVERTER...26 3.1 Introduction...26 3.2 The Proposed Circuit...27 3.2.1 Circuit Configuration...27 3.2.2 Operational Principles...29 3.3 Analysis and Design of the Proposed Converter...40 3.3.1 Voltage Gain Expression...40 3.3.2 Design of Magnetizing Inductance Lm in CCM...42 3.3.3 Design of capacitors CC, CS and CO...45 3.3.4 Soft-Switching Design...46 3.3.5 Voltage Stress Analysis...49 3.4 Control Circuit Design...52 3.4.1 DSP Interface Circuit ( dsPIC30F6010 )...54 3.4.2 Driver Circuit of Power Switches...56 3.4.3 DC Voltage Feedback Circuit...57 3.5 Comparisons with Existing Circuits...59 3.6 Summary...65 Chapter 4. SIMULATION AND EXPERIMENTAL RESULTS...66 4.1 Introduction...66 4.2 Specifications of the Proposed Prototype Circuit...67 4.3 Simulation Results...70 4.4 Experimental Results...74 4.5 Summary...85 Chapter 5. CONCLUSIONS AND FUTURE PROSPECTS...86 5.1 Conclusions...86 5.2 Future Prospects...87 REFERENCES...88

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