本論文提出一新型的雙併式直流對直流降壓轉換器電路架構。電路係由兩相同降壓式轉換器以電感互連，以並聯模式運轉，利用準諧振轉換器原理，使開關在零電壓下切換，進行電流移轉。此雙併式降壓轉換器電路可加入同步整流功能。介入之同步整流開關亦具零電壓導通與零電流截止功\\能，可得更高轉換效率。
本文建立雙併式降壓轉換器之等效電路，以基本電路原理為根本，提出轉換器之電路運作特性。最後根據參數設計方程式與流程，實際製作額定300 W轉換器以驗證功能，量測效率平均高達95.4 %。實驗證明雙併式降壓轉換器，以及加入同步整流之架構皆具有柔性切換功能與高效率的優點。

A twin-buck converter with zero-voltage-transition (ZVT) is proposed in this thesis. The converter comprises two identical buck conversion units connected in parallel by an interleaved inductor. The ZVT is accomplished by the resonating the currents between the interleaved inductor and the parasitic capacitances of the power MOSFETs. The circuit efficiency can be further improved by introducing synchronous rectification to reduce the condition loss on the diodes.
The detailed circuit analysis and operation characteristics are provided. A laboratory circuit rated at 300 W is designed and tested. Experimental results show that the switching losses can be effectively reduced by smoothly transiting the currents of the active power switches.

摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 VII
符號表 VIII
第一章 簡介 1
1-1 研究動機 1
1-2 本文大綱 4
第二章 直流對直流降壓式轉換器 5
2-1 基本降壓式轉換器 5
2-2 具同步整流之降壓式轉換器 7
2-3 並聯架構 9
2-4 具柔性切換之降壓轉換器 10
第三章 雙併式降壓轉換器之電路架構與工作原理 14
3-1 電路架構 14
3-2 工作模式 16
3-3 設計方程式 23
第四章 具同步整流之雙併式降壓轉換器 36
4-1 電路架構 36
4-2 工作模式 38
第五章 轉換器設計與實驗量測 43
5-1 雙併式降壓轉換器設計 43
5-2 具同步整流之雙併式降壓轉換器設計 49
第六章 結論與未來研究方向 52
6-1 結論 52
6-2 未來研究方向 53
參考文獻 54

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