The Research On Chaos Control Of Soft-switch DC/DC Converter

Chaos is a kind of internal random movement, which appears in non-linear systems. In recent 20 years, it has been paid great attention as a property token of non-linear system. A switched-mode DC/DC converter is a high non-linear control system, which can produce chaotic phenomenon under certain parameters. So analyzing the phenomenon of unstable action and subharmonic of DC/DC converter from the angle of linear theory and definiteness theory can not meet the increasing requirement of control performance of DC/DC converter. Under some special conditions, explaining unstable phenomenon of DC/DC converter from chaotic theory can be more reasonable and easily accepted. Based on chaotic theory, researching and designing corresponding control method can give great help to increase control performance of DC/DC converter. Based on Boost and Buck converters, this paper studies and simulates deeply the aspects of operation principle, discrete-time modeling and, chaos analysis and chaos controlling.The main work of this paper is show in detail as follows:Chapter 1 introduces the background, significance, work and innovation of the paper.Chapter 2 analyses the task and destination of chaos control, therefore, get the aim of the chaos control in the DC/DC converter.Chapter 3 sets up the discrete mathematic model of voltage-feed ZCS Boost and Buck converter, based on the model, chaotic figures are drawn, it proves that the chaotic phenomenon is ubiquity in the DC/DC converter.Chapter 4 compares the virtues and shortcomings of several kinds of control methods on chaos, adopts the OGY methods finally, and figures out the fixed points of the system in period-1 orbit.Chapter 5 introduces the application of the OGY method in DC/DC converter chaos control, utilize the OGY method to control the chaos phenomenon in Boost and Buck converter. The chaos figures are drawn to prove the correctness of the control method.At last, the paper summarizes the main points that study try to achieve and point out the further study in future.