The Research Of Chaos Control Technology And Application In Flyback Converter

Chaos is a kind of"uncertainty"phenomenon in deterministic system. It is mainly produced in the non-linear system. Switching power supply is a strong non-linear dynamic system, with a wealth of nonlinear phenomena. In a certain parameter conditions, the switching power supply will produce chaos. Therefore, by right of chaos in switching power supplies can be non-linear behavior of switching power supplies deeper and comprehensive understanding to facilitate engineering design.As the flyback topology with output ripple, output stability, small size, light weight and has a good dynamic response performance, and many other advantages, is widely used in switching power supply design. Therefore, the papers start from the flyback converter carried out on its analysis of nonlinear behavior and chaos control strategy for switching power supply stable, reliable, and provide theoretical support for optimal operation.Using non-linear analysis method to establish the state equation BUCK converter and study the generation mechanism of chaos. And then derive the discrete model to the input voltage and load resistance as a bifurcation parameter, study of the relationship that between bifurcation phenomena and the sensitivity parameters. Under some special conditions, explaining unstable phenomenon of Fly-back converter from chaotic theory can be more reasonable and easily accepted. First taking the voltage-mode controlled buck converter as an example, the discrete mapping of buck converter is proposed. And studies on chaos mechanism use Matlab. Second adding the simplified model of power transformer into the discrete mapping of flyback converter, the discrete mapping of forward converter is found. Then, the mapping is iterated and the bifurcation diagram is acquired with the input voltage, the load resistor of Power transformer as bifurcation Parameters respectively. Finally, based on modern control theory, the paper proposes an improved method of pulse-delay feedback control of chaotic phenomena flyback converter. This control method is simple and reliable and can effectively control the chaos in converters.Research flyback switching power supply chaos and control methods for switching converters in general isolated bifurcation, chaotic behavior analysis and modeling can provide a reference method.