本論文內容旨在提出一具倍流電路之新型三臂相位移直流/直流轉換 器。此一轉換器為一隔離型轉換器,一次側主要由三臂六開關與兩組變壓 器所組成,並使用相位移控制。其控制方式為每一臂之上下開關的控制訊 號為互補關係,以第一臂之上開關為基準,第二臂上開關訊號為第一臂上 開關訊號相位移一個角度,第三臂上開關訊號為第二臂上開關相位移一 個角度。二次側為兩組倍流電路並聯供電,由於有四個電感可以分流,此 一電路適合用於輸出為大電流之應用場合。此一電路主要結合相位移控 制藉由寄生電感與寄生電容之諧振達開關零電壓切換(ZVS)特性與並聯 供電的概念所建構之新型電路。最後研製一雛型電路,其規格為輸入 400 V,輸出 48 V,輸出功率為 1.44 kW,並使用數位訊號處理器(digital signal processor, DSP)實現控制法來驗證理論分析,轉換效率最高可達 93.5 %。

In this thesis, a novel three-leg phase-shift DC-to-DC converter with current-doubler rectifier is proposed. This converter is an isolated converter whose primary side is constructed by three legs, six switches and two transformers. And, the control strategy is that switch signals in the same leg are complemented. Besides, take switch signals in first leg as base, the switch signal of second leg is phase shifting an angle from the switch signal of first leg, the switch signal of third leg is phase shifting an angle from the switch signal of second leg. The secondary side is constructed by two pairs of current doubler rectifier. Because there are four inductors utilized in secondary side, this converter is suitable for high current output application. This converter combines the phase shift control which can achieve zero voltage switching with the parallel-operated concept. A laboratory prototype with input voltage 400 V, output voltage 48 V and output power 1.44 kW is built and the control strategy is fulfilled by digital signal processor (DSP). The efficiency is up to 93.5 %.

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