本文探討直流電壓輸入式變頻冷氣機的最佳效率控制，研製一交錯式降壓型轉換器，以調整冷氣機的直流鏈電壓，並減少輸入電流的漣波。
文中，利用電壓與電流感測電路，偵測相關的資訊。然後，利用本文所提出的最佳效率控制，調整冷氣機的直流鏈電壓，以減少電動機和變頻器的損失，使冷氣機運轉在最佳效率。
本文使用德州儀器公司所生產的TMS-320-F2808數位信號處理器作為控制核心。實測結果，說明本文所提方法的正確性與可行性。

The thesis investigates the optimal efficiency control of a dc-input-voltage variable-frequency air conditioner. An interleaving buck converter is implemented to adjust the dc-bus voltage of the air conditioner and to reduce the input current ripple.
By using the voltage and current sensing circuits, the relative information can be obtained. Then, an optimal efficiency control is used to adjust the dc-bus voltage, and then reduce the losses of the motor and the inverter. As a result, an optimal efficiency of the air conditioner can be achieved.
A digital signal processor, TMS-320-F2808, made by Texas Instruments Company, is used as the control center. Experimental results can validate the correctness and feasibility of the proposed method.

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