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研究生:黃鈺翔
研究生(外文):Yu-siang Huang
論文名稱:柔切昇壓型轉換器之分析與研製
論文名稱(外文):Analysis and Implementation of Soft-Switching Step up Converter
指導教授:林伯仁
指導教授(外文):Bor-ren Lin
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電機工程系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:英文
論文頁數:75
中文關鍵詞:主動箝位昇壓型轉換器雙串聯諧振零電流零電壓零電壓零電流
外文關鍵詞:ZVZCSZVSstep up converterZCSActive-clampdual series-resonant
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本論文提出主動箝位雙串聯諧振昇壓型轉換器,在同一架構的基礎上,改變其參數值,可分別實作出零電壓零電流(ZVZCS)轉換器以及零電壓(ZVS)轉換器。為了達到節省架構成本,本架構使用兩個小變壓器取代一個大變壓器來傳送能量。主動箝位電路可用於吸收儲存於變壓器漏電感的能量,降低開關的耐壓,並讓兩個開關都能操作在零電壓導通,漸少切換損失。零電壓零電流轉換器不但可以達到零電壓導通切換,還可藉由適當的設計二次測的諧振頻率達成輸出二極體操作於零電流截止,消除輸出二極體逆回復問題(reverse-recovery problem)。在瓦數上,零電壓轉換器則可達到比零電壓零電流轉換器要大得多的瓦數。關於每個轉換器的操作模式分析、設計準則以及實驗結果在本論文中都有詳細的描述。本論文的第五章,則探討零電壓零電流轉換器的條件限制。最後,分別實做完成200W零電壓零電流轉換器以及600W零電壓轉換器來驗證電路理論分析之可行性。
An active-clamp dual series-resonant step up converter is proposed in this thesis. By using the same topology, both a ZVZCS (zero-voltage zero-current switching) converter and another ZVS (zero-voltage switching) converter can be implemented. Two small transformers are used at the proposed topology to instead of a large transformer, which are much cost effective. An active-clamp circuit is used to absorb the energy stored in the leakage inductor of transformer, clamp voltage stresses across switches, and realize the ZVS turn-on of switches to alleviate the switching losses. The ZVZCS converter not only achieves the ZVS turn-on, but also carries out the ZCS (zero-current switching) turn-off to remove the reverse-recovery problem on output diodes due to choosing the angle frequency on the secondary side properly. The output power of the ZVS converter is much larger than the ZVZCS converter. Analysis of mode operation, design considerations and experimental results of each converter are described in detail. Also, the restriction of the ZVZCS converter is discussed in the section Ⅴ of this thesis. Finally, a 200W ZVZCS prototype and a 600W ZVS prototype are implemented to verify the practicability of the proposed converter.
Chinese Abstract i
Abstract ii
Acknowledgement iii
Contents iv
Tables vi
Figures vii
List of symbols ix
Ⅰ. Introduction 1
Ⅱ. Dual series-resonant circuit 4
Ⅲ. Analysis of the ZVZCS dual series-resonant converter 9
3.1 Mode operation and key waveforms 9
3.2 Design consideration 17
3.2.1 Design transformers 18
3.2.2 The ZVS condition and the calculation of magnetizing inductances 19
3.2.3 Design the clamp capacitance 20
3.2.4 Design the main switch and the auxiliary switch 20
3.2.5 Design resonant capacitances under ZCS turn-off condition 21
3.2.6 Design output diodes 21
3.3 Experimental results 22
Ⅳ. Analysis of the ZVS converter 34
4.1 Mode operation and key waveforms 34
4.2 Design consideration 39
4.2.1 Design transformers 40
4.2.2 Design magnetizing inductances 40
4.2.3 Design the external leakage inductance 41
4.2.4 Design the clamp capacitance 41
4.2.5 Design the main switch and the auxiliary switch 41
4.2.6 Design the resonant capacitances 42
4.2.7 Design output diodes 42
4.3 Experimental results 43
Ⅴ. Limitation of the proposed ZVZCS step up topology 57
Ⅵ. Conclusion 60
References 61
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