Matlab SISO TOOL을 이용한 벅 컨버터의 전압 제어기 설계 및 해석

Abstract

In this paper, the optimal design method of the step down buck converter is presented. Although many researches have been performed on the buck converter controller design method, they have disadvantages such as complexity, non uniformity for varying circuit parameters. The novel controller design method is presented in this paper. The proposed method can satisfy system requirements based on the root locus and Bode diagram approach. The design starts from the state space averaging model and the Root locus and Bode plots are designed based on the system transfer function. The proposed method is easy to implement and it has the merit of easy verification of the response characteristics through computer simulation. Also it has the merits of the easy re-design when the circuit parameters are changed. In this study, the time domain requirements are to design controller to meet the given % overshoot and the settling time. The frequency domain requirements are cut-off frequency and phase margin respectively. The design performance can be verified by comparing the results of the time domain and the frequency. And the simulation results show the very exact matching condition of the two design approaches. Therefore, it can be seen that the proposed design approach can be a good design method to satisfy the response characteristics of time domain and frequency domain and can be easily applied to the real production of the products.