本論文提出一新型高昇壓直流-直流轉換器，其架構為兩組耦合電感構成之非線性增益昇壓式轉換器電路，結合兩組倍壓電路而成，並藉由倍壓技術與調整耦合電感的圈數比來達成高昇壓比，可以使本架構比起傳統的昇壓式電源轉換器在較小的工作週期內可以達到更高的昇壓轉換比及更低的元件應力。此外，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，並且能夠有效地箝制功率開關上的電壓。如此可使用較低額定電壓與低導通電阻特性的功率半導體開關元件，有效地降低電路中的導通損失，使得轉換效率得以提升。最後完成一台輸入電壓18~26 Vdc、輸出電壓400 Vdc之200 W新型高昇壓轉換比電路以驗證所提架構，且電路整體效率最高可達95 %，滿載效率亦可達到將近94 %。

In this thesis, a novel high step-up DC-DC converter is presented. The proposed topology is composed by a nonlinear-gain boost converter with two coupled inductors and integrated with two voltage-doubler circuits to accomplish high step-up voltage ratio. The required high voltage boost ratio can be designed by adjusting the turn ratio of the coupled inductors under the voltage-doubling technique. In this way, it can achieve higher voltage-ratio at smaller duty cycle and suffer lower component stress compared with the conventional boost converters. In addition, the energy stored in leakage inductance can be retrieved during switch-off period. Moreover, the voltage across the switch is effectively clamped under a lower voltage rating and therefore a low on-resistance power switch can be adopted to reduce the conduction loss. Attributing to the above-mentioned merits, the conversion efficiency can be apparently improved. Finally, a novel high step-up DC-DC converter with 18~26 Vdc input voltage, 400 Vdc output voltage and 200 W output power is implemented to verify the proposed topology. The maximum efficiency of the proposed topology is up to 95% and full load efficiency is approximately 94 %.

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