The Chaos Design Of Buck Converter Based On Time-delay-feedback

Chaos has many complexities and randomness in determining the system.Its nonlinear motion characteristics have been studied by scholars in recent decades.The uncertainty of chaos in real applications threaten many engineering facilities.Many researchers had proposed different control methods,but some of them cannot achieve satisfactory results in actual engineering.This paper first introduces the background,research history and significance of chaos,and selects the buck converter as the research entry point to model,analyze and control the converter.The main contents are as follows:1.Modeling the buck converter and selecting the discrete mapping method,which better reflects the dynamic characteristics of the buck circuit,and research the change of the stability characteristics of the system from the period of period-doubling bifurcation to chaos.Finally it verified the existence of chaos in the buck circuit.2.Set up the SimuLink simulation model for the buck circuit,and have a more intuitive understanding of the chaotic phenomenon through the current of inductor,output voltage and phase diagram in the circuit.Then introduce several common control methods,and analyze the advantages and disadvantages of each method.Select the time-delay-feedback method to control the buck circuit.3.The experimental verification of the chaotic phenomenon of the buck circuit in the actual application is carried out.The buck circuit is built and its initial input condition is changed,and its capacitance is changed to verify the chaos’ existence in engineering applications.Then the chaotic phenomenon is controlled by the digital signal processor,and the specific circuit of each part is designed.The-time-delay-feedback algorithm is written.The experimental results prove the feasibility of the practical application of the time-delay-control method.