本篇論文利用開關訊號流程圖的建模技術建立直流轉換器之大訊號模型。藉由使用虛擬開關和虛擬開關函數之概念,直流轉換器之大訊號開關訊號流程圖模型可非常容易的被建立。此外,開關訊號流程圖模型可直接建立於MATLAB/SIMULINK之環境下,不需要使用到複雜的數學運算工作。本論文推導之直流轉換器之開關訊號流程圖模型,有助於大學部的初學者觀察直流轉換器瞬態或是穩態的特性,不論轉換器是操作在CCM或是DCM的情況下。在相同的模擬條件下,使用開關訊號流程圖模型所花費的執行時間比PSPICE模型所需之執行時間來的要更短。由實驗結果可知,開關訊號流程圖模型模擬出來的波形與實驗結果相當接近,且於使用上非常方便,推導過程也相當容易。
In this thesis, the switching flow-graph (SFG) modeling technique is used to build the large-signal model for DC-DC converters. The SFG model for DC-DC converters can be created easily by using the concept of virtual switch and virtual switching function. Moreover, the SFG model of dc-dc converters can be directly implemented in MATLAB/SIMULINK environment without complex mathematic operations. Based on the developed SFG model, it is much helpful for undergraduate beginners to observe the transient and steady-state behaviors for DC-DC converters whatever the converter is operated in CCM or DCM. The execution time of the proposed SFG model is much shorter than that of using PSPICE model. The simulation and experimental examples demonstrate that the SFG model is correct, applicable and easy to be derived.