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1、廣西師范大學(xué)碩士學(xué)位論文PWM型DC-DC功率變換器的分岔和混沌控制研究姓名:李榮申請學(xué)位級別:碩士專業(yè):電路與系統(tǒng)指導(dǎo)教師:羅曉曙20060401英文摘要IIStudy of Bifurcation and Chaos Control onPWM DC- DC ConvertersGraduate student: Li Rong Advisor: Prof. Luo Xiaoshu2003 grade, circuit and sy
2、stem speciality, nonlinear circuit theory and applianceAbstractIn this thesis, the bifurcation and the control of chaos in PWM DC- DC converters areemphatically studied, and contents of study are as follow:First, definit
3、ion and theories about chaos are summed up. Giving a brief introduction aboutthe working theories of the basic DC- DC converters , buck and boost. On the other hand, theirchaos control and development are generalized.Sec
4、ond, a new method of controlling chaos by employing a dynamical nonlinear controller isdeveloped to DC- DC buck converters towards stead periodic orbit. The controller is piecewise-quadratic function in the form of x x .
5、Third, the bifurcation and chaos of open loop current- programmed mode boost converters arestudied ulteriorly. Respectively according to ref i , E and C bifurcation parameters, bifurcationmap of boost converter is obtain
6、ed by applying flash sampling. The chaos control of this circuitsystem is investigated. Which by employing a dynamical nonlinear feedback controller achievesuccessfully chaos control in this circuit. The controller is pi
7、ecewise- quadratic function in theform of x x . This method is suitable for stability control of diversified periodic orbit by adjustingfeedback plus in the nonlinear feedback controller.Forth, an eleven- orders piecewis
8、e- smooth nonlinear dynamics model for three paralleledDC- DC buck converters is setup at first. Then the nonlinear dynamics behaviors of thisconverters are investigated preliminarily. It is found that with some paramete
9、rs, this circuitsystem appears bifurcation, chaos and period activity. Lastly, the part synchronization is studied.The research results show that under certain conditions, there are plenty of synchronizationphenomena in
10、three buck converters’ symmetrical variables. Not only is there chaossynchronization and period synchronization, but also chaos phase synchronization and periodphase synchronization.Fifth, adopting nonlinear analysis mea
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