Research Of Chaos Controlling For DC/DC Converter Based On DSP

For a long time, some problems in the DC/DC converter perplex the electronic engineers, such as sudden instability of running, high electromagnetic noise within a certain range of parameters, system crashes and so on. All of these questions are caused by the chaotic phenomenon of the DC/DC converter. Currently, nonlinear sciences research has attracted many scholars’ attention, and has become a hot research topic.In addition,many chaotic systems and chaos control methods have also been emerging.With the feature of strong nonlinear for the DC/DC converter and segmentation for the model, the nonlinear control study of the converter is still in its infancy.In the case of the DC/DC converter,this paper mainly discusses the establishment and the analysis of mathematical model, and finishes the DSP control. The main contents are as follows:(1)Establish the mathematical model for DC/DC converter. First of all, the discrete iteration model of Buck converter is established; Secondly, establish the piecewise linear model and the discrete iterative model for the Boost converter and Buck-Boost converter;Finally, in order to truly reflect the actual situation of the project, based on the characteristics of fractional calculus,a fractional Buck-Boost models is established.(2)Analyze the dynamics for DC/DC converter. First, Buck and Boost converter are briefly analyzed; Secondly, the linear model of the Buck-Boost converter of the bifurcation diagram, phase diagram and block Poincare section is detailed analyzed. At the same time,the fixed point and eigenvalue trajectory is also analyzed; Finally, analyze fractional model of Buck-Boost converter using the basic theory of fractional calculus. In order to study the model of the fractional order, this paper will derive fractional expansion which further promote the work of predecessors.(3)Conduct chaos control for DC/DC converter. First, this paper introduces several kinds of common control method, and then analyzes the advantages and disadvantages of each approach; Secondly, use passivity and OGY control methods to control the Buck and Boost converter respectively; Finally, based on the stability theorem of fractional order system, it proposes a control method of the fractional order Buck-Boost converter, and succeeds.(4)Use the DSP for the research and implementation of chaotic control of the DC/DC converter; First, make sure to choose the DSP chip, and design a specific circuit of each part; Secondly, according to the chaos control method, discrete the control method, so that the algorithm can be realized in the actual project. Finally, build the actual hardware circuit.Experimental results demonstrate the feasibility and realizability of the chaos control method.