Research On Chaotic Phenomenon Of Parallel DC/DC Converter System

With the development of science and technology,the parallel DC/DC converter has been playing an important role in practical industrial applications and scientific research because of its characteristics of high reliability,stability and large capacity.However,the inherent strong nonlinearity of the switching converter also determines the limitation of the research on the DC/DC converter,and the occurrence of the parallel current system also makes the nonlinear behavior of the system more complicate,so the traditional research and analysis method has been unable to meet the increasingly demanding performance requirements of the converter,the need to find a new and appropriate research methods is required.In recent years,the chaos phenomenon and control research of DC/DC switching converters have been paid more and more attention,which can help us to make reasonable use of chaos in the design and enhance the stability of the converter system.In this paper,the chaotic phenomenon is analyzed by using the parallel DC/DC Buck converter system as an example,and the chaotic system is controlled by the delay feedback control(TDFC)method.The main contents are as follows:(1)This paper introduces the research background,significance and status of the subject,and expounds the basic knowledge of chaos theory;(2)The discrete time mapping model is found suitable for the analysis of chaotic model by analyzing the modeling method used in DC/DC switch converter.Taking the doubleclosed-loop PI control Buck converter operating on 200 kHz as an example,the single and parallel Buck converter are analyzed.And the chaotic change process in theoretical analysis is proved by MATLAB/Simulink simulation;(3)By comparing the common chaos control methods,the TDFC method and it's improved control method based on TDFC are used to control the system.The simulation results show that the system can be controlled from the chaotic state to the steady state;(4)Use the FPGA-based hardware platform,and use the schematic diagram and VerilogHDL hardware language combination are of programming methods to experiment.The results show that the steady-state and dynamic performance of the Buck converter system are good,and the process of entering the chaotic state and the function of chaos control are realized.