以往，電源供應器的設計使用類比電路設計技術，在過去的十年內"數位式"電源設計也越來越被接受。本論文提出兩種數位式比例積分控制電源轉換器，系統硬體與韌體部分將詳細說明，電源轉換器使用降壓式直流轉直流轉換器，數位控制使用Microchip 公司的微處理器dsPIC。
為了提高數位式電源轉換器的性能，在本文討論兩種數位控制器：傳統的比例積分控制控制器和模糊比例積分控制器。現代工業界中比例積分控制器是最多人熟知和最廣泛應用，一般來說，比例控制器的優點是簡單，可靠和有效率。然而，當系統控制變為非線性時，系統性能會變差。模糊 PI 控制器一般優於傳統的比例積分控制器，特別是在高階、時間延遲、和非線性系統中。因此它的設計方法較先進，所需的計算公式比較複雜。本論文提出數學公式型比例積分控制器，儘管所提出的模糊比例積分控制器其設計仍是基於模糊數學，我們將看到其最終形式將很類似於的控制器。因此它們可以直接用來取代傳統的應用程式且很容易的實現在低成本的微控制器。在本論文中，我們將比較這兩種PI 控制器，並討論其優缺點和侷限性，模擬和實驗結果被用來驗證系統正確性。

For years, power supplies have been designed using analog circuit design techniques. "Digital" power supplies have been designed over the last decade as well, and they have gradually gained more and more acceptance. In this thesis, two PI-controlled digital power converters have been presented. The hardware and firmware parts of the proposed system are described in detail. The power converter utilized in this thesis is a simple buck converter, and the digital controller is implemented using a dsPIC micro-controller from Microchip Corp.
In order to improve the performance of the digital power converter, two kinds of digital controller are discussed in this thesis: classical Proportional-Integral (PI) controllers and fuzzy PI controllers. Conventional PI controllers are perhaps the most well-known and most widely used controllers in modern industries. Generally speaking, PI controllers have the merits of being simple, reliable, and effective.
However, their performance will deteriorate if the system under control becomes nonlinear. Fuzzy PI controllers are generally superior to the conventional ones, particularly for higher-order, time-delayed, and nonlinear systems. However, their design methods are slightly more advanced and their resulting formulas are somewhat more complicated. In this paper, a formula-type fuzzy PI controller is presented. It will be seen that although the presented fuzzy PI controllers are designed by fuzzy mathematics, their final form as controllers are conventional controllers. Therefore, they can be used to directly replace the conventional ones in applications and can be easily implemented using
low cost microcontrollers. In this thesis, we will compare these two classes of PI controllers and discuss their advantages as well as III limitations. Simulation and experimental results will also be provided to verify the correctness of the proposed system.

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