本文使用耦合電感和開關電容技術成功地集成了一種新型的升壓DC-DC轉換器。分別在電容器充電和放電能量時，使用耦合電感器實現了高升壓DC-DC增益，並通過使用被動式箝位電路從耦合電感器的漏感回收能量，因此，主電源開關的電壓應力幾乎降至輸出電壓的1/7倍。耦合電感亦減輕了二極體的反向恢復電壓所產生的問題，可以進一步提升電路效率，以實現高電壓增益。本文所提出的電路架構非常容易實現，此轉換器只有一個開關，並不需要高壓端開關驅動器。運作原理分析包括連續導通模式、不連續導通模式和邊界導通模式，並對所提出的轉換器的穩態進行了探討與計算。最後，實驗室建立一輸入電壓為24V，輸出電壓高達400V，最大功率為150W的硬體實作電路，最高效率近96.2%。實驗和模擬都證實了所提出耦合電感和開關電容技術電路的可行性，且成功地降低主電源開關的電壓應力和輸出電容的大小。元件選擇可採用低導通電阻的開關，降低開關上的傳導損耗，實現高升壓與高效率。

In this study, a novel high step-up DC–DC converter was successfully integrated using the coupled inductor and switched capacitor techniques. High step-up DC–DC gain was achieved using a coupled inductor when capacitors charged and discharged energy. Furthermore, energy was recovered from the leakage inductance of the coupled inductor by using a passive clamp circuit. Thus, the voltage stress of the main power switch was almost reduced to 1/7 Vo (output voltage). In addition, the coupled inductor alleviated the reverse-recovery voltage problem of the diode. The proposed circuit efficiency can be further improved and high voltage gain can be achieved. This proposed circuit is easy to achieve because the converter has only one switch and does not need a high side driver. The operation principle that involves continuous conduction mode, discontinuous conduction mode, and boundary conduction mode are analyzed, and steady-state analysis of the proposed converter was discussed and calculated. Finally, a hardware prototype circuit with the input voltage of 24 V, output voltage of up to 400 V, and maximum power of 150 W was constructed in a laboratory and its maximum efficiency reached to 96.2%.
Both experimental and simulation verifications confirm that implementing the proposed coupled inductor and switched capacitor technique circuit can reduce the voltage stress of the main power switch and the size of the output capacitance. Component selection can be performed and a low Rds(on) of power switch can be adopted and so that conduction loss is reduced to achieve high step-up and high efficiency.

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