本文研製以數位控制實現三相三階直流交流轉換器，在直流交流功率轉換部分，本文採用T型式拓樸架構，此架構所使用元件數少，可減少開關之電壓應力，且有效減少輸出電壓諧波含量。控制核心為Texas Instruments TMS320F28335數位信號處理器，其晶片功能完善，具有浮點數運算器，適合應用於三相控制。本文使用載波脈波調變技術，運算簡單，易於實現，此外線性區內最大振幅調變係數可達1.154，與空間向量調變技術相同。最後實際製作6 kW直流交流轉換器，印證所提理論之可行性。

This thesis proposes the design and implementation of a digitally-controlled three phase three level inverter. The proposed three level circuit which is using T-type topology. The benefits of this topology are using fewer components, reducing the devices stress and the lower output voltage THD. A digital signal processor (DSP) chip is Texas Instruments TMS320F28335. It’s a high performance digital control chip and also has floating-point unit (FPU). Therefore, it’s suitable for three phase controlled application. The proposed modulation strategy is carrier-based pulsewidth modulation. This technique can be implemented with a very simple algorithm and, hence, can be processed very quickly. In addition, it can generate the maximum modulation index up to 1.154 that is attainable under linear modulation, such as space vector modulation. Finally a 6 kW three phase T-type inverter is implemented.

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