臺灣博碩士論文加值系統

本論文主旨在研製一台三相Y-接主動雙橋式直流-直流轉換器，此架構適合高功率高輸入電壓及高輸出電流的應用。電路架構以三個變壓器用Y-接的方式連接、變壓器一、二次側開關採用三相主動雙橋式，即為變壓器兩側皆有三臂半橋開關（十二個開關）及三組諧振槽所組成。相較於一般全橋轉換器，三相電路的變壓器能平均分擔總輸出功率，加上Y-接的特性，在高壓側利用Y接可減少變壓器所需要的匝數，在高電流側利用接可以減少變壓器所需要的股數，如此就能減小變壓器的體積；開關控制訊號一、二次側每一臂相位互差120，並利用一、二次側相移的控制方式，來調節傳輸功率，並讓所有開關皆可達成零電壓切換。
本文首先介紹主動雙橋式直流-直流轉換器，接著探討三相變壓器的特性及三相Y-接主動雙橋式直流-直流轉換器的動作原理，並推導出傳輸功率及柔切條件。最後實作出一台輸出功率為2 kW的實體電路，在不同負載下皆可達成零電壓切換，整體效率可在90 ％以上。

This thesis presents a three-phase wye-delta connected dual active bridge (DAB) DC-DC converter. This topology suits high input voltage and high output current applications very well. The power stage consists of three wye-delta connected transformers, three half-bridge switches in each side of the transformers, and three resonant tanks. Compared to single-phase full-bridge converter, three transformers can share the output power; furthermore, with the feature of wye-delta connection, the turns of high voltage winding and wire gauge of high current winding can be reduced. Thus, the size of transformers can be shrunk. The control signals of primary side and secondary side are 120 phase shifted between each leg of the three phases. And the power of converter is controlled by phase-shift control between primary side and secondary side. In addition, every switch can achieve zero-voltage-switching (ZVS).
This thesis will introduce DAB converter first. And then, studies the characteristic of three-phase transformers and operation states of three-phase wye-delta connected DAB DC-DC converter. The power transfer function and soft-switching conditions are included. Finally, a laboratory prototype with 2 kW rated power output is built and tested. The measured efficiency is above 90  under a range of load conditions and all the switches can achieve ZVS.

摘　要 iii
Abstract iv
誌　謝 v
目　錄 vi
圖索引 viii
表索引 x
第一章 緒論 1
1.1 研究動機與目的 1
1.2 研究內容 2
1.3 章節大綱 2
第二章 主動雙橋式直流-直流轉換器原理 3
2.1 主動雙橋式直流-直流轉換器架構 3
2.2 主動雙橋式直流-直流轉換器動作原理 4
2.3 主動雙橋式直流-直流轉換器公式推導 7
第三章 三相主動雙橋式直流-直流轉換器原理 9
3.1 三相變壓器說明 9
3.2 三相主動雙橋式直流-直流轉換器架構 12
3.3 三相主動雙橋式直流-直流轉換器動作原理 13
3.4 三相主動雙橋式直流-直流轉換器傳輸功率分析 21
3.5 三相主動雙橋式直流-直流轉換器柔切條件 26
3.6 三相主動雙橋式直流-直流轉換器相移控制方法 28
第四章 電路參數設計 30
4.1 電路參數制定 30
4.2 電感設計 30
4.3 變壓器設計 31
4.4 功率開關選擇與輸出電容設計 35
4.4.1 一次側功率開關選擇 35
4.4.2 二次側功率開關選擇 36
4.4.3 輸出電容設計 36
第五章 實驗量測結果與數據 37
5.1 實驗波形 37
5.2 實驗結果 41
第六章 結論與未來展望 42
6.1 結論 42
6.2 未來展望 43
參考文獻 44

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