本論文旨在研究與設計具有高升壓比之新型高昇壓比直流-直流功率轉換器。此新型高昇壓直流-直流電源轉換器具有高昇壓增益比、高轉換效率與低開關電壓應力之特性。在第一種新型高昇壓比直流-直流電源轉換器中，主要是利用電壓昇舉技術與調整耦合電感的圈數比來達到高昇壓增益之功能。在另一種新型高昇壓比直流-直流功率轉換器中，其高昇壓增益是藉由倍壓技術與調整耦合電感的圈數比來達成。此外，在所提出的新型高昇壓比直流-直流功率轉換器中，儲存於耦合電感中之漏電感能量，可藉由開關在截止期間予以回收，因此轉換效率得以提升，並且能夠有效地箝制功率開關上的電壓。有鑑於此，可使用具有較低額定電壓與低導通阻抗特性的功率半導體開關元件，因此可有效地降低電路中的導通損失，使得轉換效率得以提升。本論文中亦對所提之新型高昇壓比直流-直流功率轉換器作一詳細的穩態電路動作分析，並對於轉換器中之電壓增益與邊界工作條件亦作詳細的推導。最後實際設計製作完成所提之新型高昇壓比直流-直流功率轉換器的硬體電路，並藉由實際電路量測結果，驗證此新型高昇壓比直流-直流功率轉換器確實具有高昇壓增益、高轉換效率以及低開關電壓應力之特性。此新型高昇壓直流比-直流電源轉換器可適用於如車用HID頭燈照明、不斷電系統之直流儲能、電動載具驅動系統、太陽能與燃料電池等系統的前級電源轉換器上。

Novel step-up DC-DC converters with high step-up voltage ratio are proposed in this dissertation. These proposed converters have the features of high efficiency, high step-up voltage ratio, and low voltage stress on power switches. In this dissertation, one of the proposed high step-up converters can achieve high step-up voltage ratio by adjusting the turn ratio of the coupled inductor and voltage-lift technique for energy conversion. The other high step-up converter can adopt voltage double technique and adjusts the turn ratio of the coupled inductor to accomplish high step-up voltage ratio for power conversion. In addition, for these proposed converters, since the energy stored in the leakage inductor is recycled during switch-off period, the conversion efficiency can be improved. Also, the voltage on the active switch is clamped effectively for the low voltage rating and a low on-resistance power switch is selected to reduce conduction loss. Moreover, this dissertation describes the operating principle and steady-state analysis for the proposed converters. Also, the step-up voltage gains and boundary conditions of these converters are obtained. Finally, laboratory prototype converters were built to demonstrate the performances, including high voltage ratio, high conversion efficiency and the effective suppression of the voltage stress on power switch. The proposed high step-up converters can be used for the applications involving power conversion, such as high-intensity discharge lamps for automobile headlamps, DC back-up energy for uninterruptible power supplies, drivers for electric vehicles, the front-stages of fuel cell and solar cell power conversion.

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