| Power electronic is a relatively new and fast-growing area of electronics with wide practical application. Power electronic exhibits a wealth of nonlinear phenomena. A switched-mode DC/DC converter is a high non-linear control system, which has intrinsic non-linear. Under certain conditions, the converter may have seemingly random chaos without repetition, such as bifurcation and chaos. Chaos is a kind of seemingly random, chance or irregular movement, which appears in a definiteness system. Based on Buck converters, this paper has studied and simulated deeply in the aspect of operation procession, discrete-time modeling, and bifurcation discussion of converters.The main work of this paper is shown in details as follows:(1) The paper introduces the brief history of chaos research and mathematical mechanism of chaos, discusses the development and orientation of nonlinear research in power electronics circuits both at home and abroad. Briefly introduce the former study of chaos and the common method of chaos modeling.(2) Some discrete-time maps based on different switching mode are summarized and analytical expressions suitable for general DC/DC converters are present.(3) The principle of several methods of chaos control and its advantage and disadvantage are summarized, and methods of controlling of chaos suitable for DC/DC converters are demonstrated.(4) Based on module theory, the operation state analysis of voltage-feed ZCS Buck converter has been simplified and the time-discrete mathematic modeling of DCM mode has been setup.(5) The stability operation parameter range has been decided according to the stability criterion, and the analysis of influent of resonance inductance and capacitance to converter's chaos character is carried out. |
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