本論文提出弦波調變升降壓返馳式轉換器之微型換流器系統，其中升降壓返馳式轉換器利用弦波調變將太陽能直流電壓轉成連續半正弦波，經低頻全橋換流器轉為交流。此控制優點為輸出電流諧波低且系統效率高。升降壓返馳式轉換器電路架構簡單且元件數目少、並具有漏感回收以及開關電壓箝位。本文首先針對升降壓返馳式轉換器進行理論推導、穩態分析及弦波調變設計。最後實作一300 W微型換流器系統以驗證弦波調變之可行性，太陽能模擬器之輸出電壓30 ~ 48 V，微型換流器輸出為220 Vac / 60 Hz，系統最高效率可達96 %。

This thesis presents a sinusoidal modulated buck/boost flyback integrated converter for micro inverter applications. The proposed sinusoidal control modulates the PV dc output to a positive sinusoidal output waveform then fed the sinusoidal current into grid by using a low frequency DC-AC inverter. The advantages of the proposed method and buck/boost flyback integrated converter are low output current harmonics, high efficiency, simple structure, and low component counts. Also, the energy stored in the leakage inductance can be recycled and the voltage of switches can be clamped. The operating principles, steady-state analysis, and sinusoidal modulated design are discussed. Finally, a 300 W prototype of the proposed micro inverter is implemented in the laboratory for feasibility verification. The PV simulator output voltage is from 30 V to 48 V, and the output voltage is 220 Vrms/60 Hz. The maximum efficiency is 96%.

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