本論文主要提出應用圓型疊層式壓電變壓器於電源轉換器之架構，藉由結合脈波寬度調變與頻率調變的控制方法，俾使其得以有良好的線調節及負載調節特性，且達到高輸出轉換效率的表現。在圓型疊層式壓電變壓器部分，先利用MATLAB進行分析及設計，再模擬其特性並實際量測。於電源轉換器部分，將其規劃成變流器、輸出濾波整流、控制電路等三部分來討論，文中說明搭配於壓電變壓器之串聯諧振網路的型式，以找尋較適合的諧振網路，最後將其電路實現並量測實驗結果。電源轉換器的工作頻率約103kHz，當輸入交流電壓100 ~ 120V時，輸出直流電壓18V、負載電流0.6 ~ 1.2A，最高轉換效率達92%。

This thesis presents a power converter utilizing round-shaped multi-layer piezoelectric transformer. The combination of pulse width modulation and pulse frequency modulation makes it possible to control the output voltage. The power converter has good regulations for both the line and load variations, and the highest efficiency is achieved. MATLAB is used to analyze and design the round-shaped multi-layer piezoelectric transformer, the characteristics of which are also simulated and measured. The power converter is separately discussed for inverter, rectifying circuit and control circuit; besides, the resonant circuit connected in series to the PT is illustrated for appropriate ones. The converter implemented on a printed circuit board is experimentally evaluated, and as a result, good controllability is successfully achieved. The highest efficiency is 92% at an input voltage of AC 100~120V, output voltage of 18V, load current of 0.6~1.2A, and operating frequency is around 103kHz.

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