臺灣博碩士論文加值系統

本論文研製出新型隔離交錯式高昇壓轉換器，在一次側採用交錯式架構，並用兩顆耦合電感作為輸入電感，不僅是用來傳遞能量，也可使輸入電流漣波減少。主動箝位電路中搭配內置變壓器，箝位電容可回收漏感能量、減少主開關上的電壓應力，同時也可達到昇壓電容之功能並將能量經由內置變壓器傳遞到二次側。耦合電感及內置變壓器皆具有電氣隔離且在二次側組成倍壓電路，並達到提高電壓增益的效果。所提出轉換器之實驗電路規格以輸入電壓48V、輸出電壓380V以及額定功率1.5kW之條件下驗證其可行性以及有效性，所提出轉換器之最高效率為96.18%,滿載效率為94.77%。

In this thesis, a novel isolated interleaved high step-up converter (IIHC) is proposed. Interleaved structure with coupled inductors is used in the primary side, not only reduce the current ripple, but also transfer the energy to the secondary side. The active clamp circuits with built-in transformer are employed to recycle the energy stored in the leakage inductors, reduce the voltage stress on the main switches. The coupled inductors and the built-in transformer not only constitute a voltage-doubler circuit in the secondary side, but also achieve galvanic isolation. Consequently, the high voltage-gain can be completed without extreme duty-cycle or high turns ratios. Furthermore, the proposed topology can operate in continuous conduction mode(CCM) and discontinuous conduction mode(DCM). The prototype circuit with the input voltage 48 V, the output voltage 380 V and the rated power of 1.5 kW are implemented to demonstrate the functionality of proposed topology. The measured full-load efficiency is 94.77%, and the peak efficiency is 96.18% at 560 W, respectively.

Contents
摘要………………………………………………………………………………………i
Abstract…………………………………………………………………………………ii
致謝……………………………………………………………………………………..iii
Contents………………………………………………………………………………....v
List of Tables .................................................................................................................. vi
List of Figures ............................................................................................................... vii
List of Nomenclatures ................................................................................................. viii
Chapter 1 Introduction ................................................................................................... 1
1.1 Background ......................................................................................................... 1
1.2 Motivation .......................................................................................................... 2
1.3 Organization ....................................................................................................... 3
Chapter 2 Overview of The Converters with High Step-Up Feature ......................... 4
2.1 Isolated High Step-Up Converter ....................................................................... 4
2.2 Isolated Bidirectional Converter (Step-Up Mode) ............................................. 5
Chapter 3 The Proposed Isolated High Step-Up Interleaved Converter ................... 7
3.1 Introduction of the Proposed IIHC ..................................................................... 7
3.2 Operating Principle ............................................................................................. 8
3.3 Steady-state Analysis ........................................................................................ 19
3.3.1 Voltage Conversion Gain ....................................................................... 24
3.3.2 Voltage Stress ......................................................................................... 26
3.3.3 Current Stress and Average Current ....................................................... 28
3.3.4 Effects of the Equivalent Resistances of the Proposed IIHC ................. 32
3.3.5 Design Considerations ........................................................................... 48
3.4 Experimental Results ..................................................................................... 50
3.4.1 The Experimental Results of CCM Situation ........................................ 51
3.4.2 The Experimental Results of DCM Situation ........................................ 53
3.4.3 The Measured Conversion Efficiency of the Proposed IIHC ................ 55
vi
Chapter 4 Conclusion and Future Research ............................................................... 58
4.1 Conclusion ..................................................................................................... 58
4.2 Future Research ............................................................................................. 58
References. ...................................................................................................................... 60

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