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研究生： 邱嗣允
Szu-Yun Chiu
論文名稱： 數位控制應用於非對稱全橋轉換器
Asymmetrical Full Bridge Converter with Digital Cantrol
指導教授： 呂錦山
Ching-Shan Leu
口試委員: 林景源
Jing-Yuan Lin
謝耀慶
Yao-Ching Hsieh
學位類別： 碩士
Master
系所名稱： 電資學院 - 電機工程系
Department of Electrical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 75
中文關鍵詞： 數位控制 、零電壓切換 、不對稱控制 、可調變死區時間
外文關鍵詞： variable adjustable dead time, circulation loss
相關次數： 點閱：327  下載：7 
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    • 全橋轉換器，被廣泛應用於高輸入電壓，高功率應用。對稱全橋轉換器已使用了很長的時間。由於其開關的硬切操作，而切換損失造成轉換器的效率下降以及限制轉換器的功率密度。
    為了提高效率，相移全橋變換器已經在過去的三十年中提出的。因為它可以實現開關零電壓切換，因此可以降低切換損失。為了進一步提高效率，可以使用不對稱的控制可以降低循環損耗。
    因此，不對稱的全橋轉換器被提出，且實現開關零電壓切換操作。並透過數位控制可調變的死區時間，使得開關零電壓切換範圍提升。
    本論文除了對研製之電路進行動作原理與理論分析，並且也進行實驗結果之驗證，研製電路之規格如下: 輸入電壓: 300-400 V;輸出電壓24 V;額定功率360W;操作頻率:100 kHz。經由實驗結果驗證以及比較，均具有與理論分析之結果相符。

    Full-bridge converters have been widely used in high-input-voltage, high-power applications. The symmetrical full-bridge converter has been used for a long time. However, it has large switching losses owing to its hard-switching operation, which impacts its conversion efficiency and limits its power density.
    To improve efficiency, the phase shift full-bridge converter (PSFB) has been proposed in the last three decades. Because it can achieve zero voltage switching (ZVS) operation, the switching turn-on losses are significantly reduced. To further improve efficiency, circulation loss can be reduced by asymmetrical control.
    Thus, the asymmetrical full-bridge converter (AFB) is proposed to achieve ZVS operation for a wide range of loads, and digitally controlled adjustable variable dead time can be achieved.
    In addition to the descriptions of the operation principle and design consideration, two hardware circuits—the AFB and AFB with digitally controlled adjustable variable dead time—with the same 300–400 V input and 12 V/ 360 W output specifications were built and compared.

    Abstract I Acknowledgement II Table of content III List of Figures V List of Table IX Chapter 1 Introduction 1 1-1. Background and Motivation 1 1-2. Objectives of the Thesis 6 1-3. Organization of the Thesis 7 Chapter 2 Asymmetrical Control Full-Bridge Converter(AFB) 8 2.1 Introduction 8 2.2 Operational Principle 12 2.3 Circuit Analysis 18 2.3.1. Voltage gain 18 2.3.2. Voltage stress 19 2.3.3. Transformer dc-bias current 20 2.3.4. ZVS condition 20 2.3.5. Duty cycle loss 24 2.3.6. Circulation loss 24 2.4 Circuit Design 25 2.4.1. Transformer design 25 2.4.2. Output inductor Lf 28 2.4.3. Output capacitor Cf 29 2.4.4. Semiconductor components 29 2.5 Experimental Results 30 2.6 Summary 37 Chapter 3 Design and Implementation of Digital Control 40 3.1 Introduction 40 3.2 Design of Digital Control 41 3.2.1. TMS320F28035 41 3.2.2. Analog-to-Digital Conversion (ADC) 42 3.2.3. Enhanced Pulse-Width-Modulator (EPWM) 44 3.2.4. The Flowchart of Digital Control 46 3.3 Digital Compensator 61 3.4 Experimental Results 65 3.5 Summary 67 Chapter 4 Conclusions and Future Researches 68 4-1. Conclusions 68

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