本論文將升壓轉換器以電壓源及電流源的系統概念方式分析，並利用耦合電感在開關切換時會改變二次側的電壓極性的特性，創造出可調整的電壓源以及電流源，將此耦合電感搭配切換式電容以及電壓提升技術，使得二次側電容具有並聯充電串聯放電方式來建立高壓輸出，以此概念設計出兩種升壓方法，之後將目前常見之高升壓轉換器以系統化方式分析，搭配所提出的耦合電感方法，提出四種高升壓轉換器應用架構。傳統上利用耦合電感的高升壓比轉換器必須藉由多組繞組或者較大的圈數來達到高升壓的作用，造成漏感變大及導通損增加，而疊接多級電容來使輸出電壓變高的升壓方式，電容能量傳遞上的損失會較大。本文所提升壓方法所設計的高升壓比轉換器，與傳統比較具有更高的電壓轉換比，因此轉換器開關上的電壓應力也較低，可選擇低導通損失的開關元件，並且在一樣升壓倍數下與傳統比較可使用較少匝數及較少電容，此外由於所提出四組新型高升壓轉換器皆具有被動式箝位電路，漏感的能量可以被回收，轉換器具有更高效率，於硬體電路實現上，此種方法所設計的轉換器，只需一個開關，控制電路設計簡單，且和輸出輸入端共地，不需額外增加開關的隔離驅動電路。於此論文中會詳述此種設計方法之演變以及所提出的轉換器應用例之模式分析以及詳細推導此轉換器的臨界導通模式和電壓轉換比，最後，將會實現轉換器之雛型電路以驗證理論之可行性，實驗測試中包含了轉換器之電壓，半導體元件的電壓應力以及轉換器的效率，此種轉換器可以應用於太陽能電池之前級架構以及燃料電池的前級架構和不斷電系統等等。

In this dissertation, the step-up converters are analyzed with voltage source and current source. When switch is turned on and off, the coupled-inductor changes the polarity on the secondary-side. Adjustable voltage source and current source are created. According to the characteristic, the switched-capacitor and voltage-lift techniques can be combined with it. Two step-up methods are proposed. Then, systematize high step-up converters with the step-up methods, five high step-up converters are proposed. Conventionally, the high step-up converters use more turns ratio to achieve high step-up gain. The leakage inductor is large and efficiency is low. Some high step-up converters use a lot of capacitors to add the step-up gain. The more stage transition is used and efficiency is low. High step-up converters used twp proposed methods to design can have high voltage gain than others. Thus, fewer turns ratio and fewer capacitors are used to achieve high step-up gain. In addition, all of four converters have lossless passive snubber circuit, the energy of leakage inductor is recycled. The low on-resister can be adopted and conduction loss is reduced. High efficiency is achieved. In hardware implementation, four converters are easy to realize because theses converters have only one switch and don’t need high-side driver. The control circuit is also easy to design. The mode analysis is described clearly in this dissertation. Also, the step-up gain and boundary condition of these converters are analyzed and calculated. Finally, the prototypes of five converters are built to demonstrate the performance which includes the voltage gain, voltage stress of semiconductors, efficiency and boundary condition. These high step-up converters are suitable for becoming front-end stage of solar system, full cell converter, uninterruptible power supply.

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