本論文主要研究「錯相式準諧振零電流切換順向轉換器」，電路採用兩組準諧振順向式轉換器並聯以提高輸出功率，而開關之觸發訊號為錯相方式驅動，可減小輸出電流漣波。另外，使用準諧振特性達到開關的零電流切換，降低切換損失。本論文首先探討錯相式準諧振零電流切換順向轉換器電路架構之特性與優缺點，並分析電路工作原理及設計過程。最後實際製作「錯相式準諧振零電流切換順向轉換器」，電路之輸入直流電壓為200 V，輸出為24 V/10 A。由實驗結果可知，開關截止時可達到零電流切換，而兩組輸出電感電流均流效果佳，並降低總輸出電流漣波。此外負載電壓調整率均維持在±1 %以內，滿載效率為90.9 %。

In this thesis, interleaved forward quasi-resonant (QR) zero current switching (ZCS) converters are studied and implemented. Two forward QR converters are parallel connected to increase output power. The interleaved technique is used to control the gate driver signals of two forward QR converters to reduce output current ripple. Also, the QR technique with ZCS is employed to reduce switching losses. The characteristics of the proposed converter are discussed, and the operation principles and design process are studied. Finally, interleaved forward QR ZCS converters with 200 V DC input voltage, 24V/10A output are implemented to verifying the theoretical analysis. Experimental results show that the switches are turned off with ZCS. The output inductor currents are balanced, and the output current ripple is reduced. Besides, the voltage regulation is ±1 %, and the efficiency is 90.9 % under 10 A output condition.

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