開發與利用再生能源已是全球經濟發展的首要課題，然而有效轉換再生能源以供應電力至市電或負載，亦為電力轉換器技術重點發展的一環。本論文提出並探討四種新型具有高昇壓比、高效率直流-直流功率轉換器架構。架構一係利用串接式架構組合一個新型二次昇壓功率轉換器來實現高昇壓應用;其昇壓比可達輸入電壓的20倍，最高效率為92.1 %。架構二係以架構一為基礎再加入電壓倍增技術而衍生另一高昇壓轉換器，並可進一步降低開關責任週期與耦合電感匝數比，使得最高效率提昇至93.2 %。架構三與架構四則以耦合電感轉換器結合切換電容技術以實現高昇壓比、高效率功率轉換器；藉耦合電感二次側聯結方式不同，可分為昇壓順向式和昇壓反馳式兩種。其進一步提昇最高功率轉換效率分別為96.4 % 和 96.3 %，較二次昇壓型功率轉換器有顯著提昇。以上四種功率轉換器皆具有三種共同特性；首先，皆為單開關驅動方式，且不須高變壓器匝數比和責任週期；第二為漏感能量皆能有效地回收並傳送到負載；第三為漏感抑制切換電容上的湧浪電流大小。這些特性架構出高效率與高昇壓功率轉換器的主要模式。內文中分別就上述四種高昇壓轉換器做詳細的穩態電路分析、電壓增益推導、和分析耦合電感中激磁電感於連續、非連續、以及邊界工作條件。在此耦合電感被定義為結合激磁電感、漏感和一理想變壓器之元件。依分析結果，設計並實作上述四種高昇壓轉換器的硬體電路，且經由實際電路量測數據與波形圖來驗證理論分析。而上述四種高昇壓比直流-直流轉換器之實測結果與理論推導相符，高昇壓比及高轉換效率直流-直流轉換器已於本論文中被實現與驗證。

Renewable resource development and utilization is most important subject for globe economic. However, effectively converts renewable energy to electricity or supply load by high efficiency power converter technology also becoming increasingly important. In this dissertation, four high step-up conversion ratio converters are proposed. Based on cascading input and coupled-inductors to form a novel quadratic boost converter is proposed. The voltage gain of this type of converter has 20 times the voltage of regular input, with a maximum efficiency of 92.1 %. To reduce duty and turn ratios, the quadratic boost converter applies the voltage multiplier technique, thereby performing at a higher maximum efficiency of 93.2 %. By integrating the switched-capacitor technique and coupled-inductor technology, thereby forming two switched-capacitor step-up converters, the boost-forward and the boost-flyback converters achieve maximum efficiency of up to 96.4 % and 96.3 %, respectively. These converters have common essential characteristics. First, both require single active-switch driving, and both do not need extreme duty and turn ratio values. Second, the leakage energy of the coupled-inductor is efficiently recycled to the load. Third, the inrush current problem among switched-capacitors is constrained by the leakage inductance. These features are the main reasons behind the high efficiency and high voltage conversion ratio performance of the proposed model. In this study, the coupled-inductor is defined as a device configures magnetizing inductance, leakage inductance, and an idea transformer. The operating principles and steady-state analyses of continuous conduction mode (CCM), discontinuous conduction mode (DCM), and boundary conduction mode (BCM) are discussed in detail. Moreover, all the prototype converters are used respectively to verify and demonstrate their performances.

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