Study On Chaos And Its Control In PWM DC-DC Converter

The DC-DC power converters are the core of the switching power supply. as the DC-DC power converter is a strongly nonlinear systems, which are bound to exist in a variety of bifurcation and chaos of nonlinear phenomena, often resulting in DC-DC power converter in the actual run-time. There were some singular and irregular phenomena, such as the critical state of sudden collapse, unknown electromagnetic noise, the system instability and the system can not be run according to design requirements. Thus, DC-DC power converter of non-linear phenomenon in recent years has become the forefront of a new topic.This paper has studied and simulated deeply in the aspect of operation procession, discrete-time modeling, and bifurcation discussion of converters Based on the PWM BUCK converter. Chaos control has been studied and simulated too.the paper introduces the definition and characteristics about chaos, discusses the development and orientation of nonlinear research in power electronics circuits both at home and abroad the state equation of DC-DC converter was generated, the dynamic equation was generated based on sample-date and Gayley - Hamilton, them could help to study chaos.Analyzing the chaos dynamic characteristics of the DC-DC converter. using MATLAB to simulate the PWM BUCK converters. The simulation results show that some circuit parameters, such as input voltage,resistance and capacitance, are changed, the system will track along the campaign cycle times, and ultimately into the chaotic phenomena.in this dissertation some control method of chaos are introduced, and controlling chaos in the voltage-mode BUCK converter based on the time-delay feedback control method, changing the system operation status can make chaos to the stable state of single-cycle conversion, the simulation results and validity of TDFC was gotten.