臺灣博碩士論文加值系統

本論文提出一個三階混合式轉換器於高輸入電壓下之研製，功率開關元件利用諧振電感與開關輸出電容於轉換狀態時進行諧振，達到零電壓切換特性以降低切換損失。此外，為能使此轉換器於高輸入電壓與高輸出電流之設備應用，輸入端使用兩顆電解電容串聯來降低功率開關元件電壓應力，增加飛輪電容使輸入電容電壓自動平衡分壓。同時，為了解決高電壓輸入時半導體元件耐電壓過大之缺點，因此電路中加入箝位二極體來限制功率開關元件電壓為輸入電壓之一半。
本論文提出之電路在前級部分採用一組全橋架構與兩組半橋架構，達到高功率與減少功率開關元件等優點，後級為了滿足大電流輸出之相關應用，則採用中間抽頭整流之方式 。
本論文提出之轉換器架構經實際製作驗證其可行性，電氣規格為輸入電壓750Vdc ~ 800Vdc，輸出電壓24Vdc，負載電流60A，輸出總瓦數為1440W。

This thesis studies and implements a three level hybrid converter for high input voltage and high load current applications. Power switches in the proposed converter can be achieved at zero voltage switching based on the resonant behavior by resonant inductor and output capacitance of power switches. Thus, the switching losses of power switches are reduced. For high input voltage and high output current applications, two input aluminum capacitors and series power switches are adopted to limit the voltage stress of power switches at Vin/2. Flying capacitor is also adopted to automatically balance the input split capacitor voltages. At the primary side, two three-level hybrid converters are adopted to increase output power and reduce the power switch counts.
Finally, a laboratory prototype with input voltage 750Vdc ~ 800Vdc and 1440W rated power (24Vdc/60A) was built and tested to verify the circuit performance of the converter..

中文摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 x
第一章 導論 1
1.1 研究背景與動機 1
1.2 研究內容 3
1.3 論文綱要 5
第二章 三相電源之簡介與應用 6
2.1 三相電源與單相電源介紹 6
2.1.1單相交流電源 7
2.1.2 三相交流電源 8
2.2 功率因數與電力濾波器之介紹 10
2.2.1 功率因數 10
2.2.2 電力濾波器 12
第三章 三階電源轉換器與混合型轉換器 16
3.1 三階電源轉換器 16
3.1.1 三階零電壓切換轉換器 16
3.1.2 三階相移式零電壓切換電源轉換器 16
3.1.3 三階全橋相移式零電壓轉換器 17
3.2 三階混合型轉換器介紹 20
第四章 三階混合型電源轉換器 22
4.1 前言 22
4.2 電路架構與工作原理 22
4.3 電路動作模式分析 23
4.3.1 模式一(t0～t1): 25
4.3.2 模式二(t1～t2): 26
4.3.3 模式三(t2～t3): 28
4.3.4 模式四(t3～t4): 30
4.3.5 模式五(t4～t5): 32
4.3.6 模式六~模式十(t6～t10): 34
第五章 元件選擇與預估效率 35
5.1 電路穩態分析 35
5.2 元件設計 36
5.2.1 變壓器的設計 36
5.2.2 開關的設計 37
5.2.3 輸出濾波電感的設計 37
5.2.4 輸出整流二極體的設計 38
5.2.5 諧振電感的設計 39
5.2.6 輸入濾波電容的設計 39
5.3 預估效率 39
5.3.1 變壓器的選擇與損耗 40
5.3.2 開關的選擇與損耗 43
5.3.3 輸出濾波電感的選擇與損耗 44
5.3.4 輸出整流二極體的選擇與損耗 47
5.3.5 諧振電感的選擇與損耗 48
5.3.6 預估電路滿載效率 48
第六章 硬體製作與實驗結果 50
6.1 硬體製作 50
6.2 電路架構驗證之波形 52
6.3 使用SIMetrix-SIMPLIS模擬軟體之波形 72
6.4 實際效率 77
第七章 結論與未來展望 78
7.1 結論 78
7.2 未來研究方向 79
參考文獻 80

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