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Design And Implementation Of Z-source Full-bridge Dc/dc ConverterUcar, Aycan 01 September 2012 (has links) (PDF)
In this work, the operating modes and characteristics of a Z-source full-bridge dc/dc converter are investigated. The mathematical analysis of the converter in continuous conduction mode, CCM and discontinuous conduction mode-2, DCM-2 operations is conducted. The transfer functions are derived for CCM and DCM-2 operation and validated by the simulation. The current mode controller of the converter is designed and its performance is checked in the simulation. The component waveforms in CCM and DCM-2 modes of operation are verified by operating the prototype converter in open-loop mode. The designed controller performance is tested with the closed-loop control implementation of the prototype converter. The theoretical efficiency analysis of the converter is made and compared with the measured efficiency of converter.
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Equações diferenciais de Liénard definidas em zonas / Liénard of differential equations defined by zonesRuiz, Jeidy Johana Jimenez 04 March 2016 (has links)
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Previous issue date: 2016-03-04 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / The study under existence and uniqueness of limit cycles of equations systems differential
is a very active research topic in the qualitative theory of dynamical systems. In this
theme we study this topic in discontinuous dynamic systems. Let’s make this in Liénard
differentials equation systems, allowing a line of discontinuity. Furthermore, we present
the known method of Averaging firstly in your classic version, that is, for class fields at
least C2, we study also to generalized version, to piecewise- smooth dynamical systems.
As a result, we use this tool to determine the number of limit cycles that can bifurcate of
a planar center, inside the equation Liénard differentials equation class. / O estudo sobre existência e unicidade de ciclos limites de sistemas de equações diferenciais
é um tópico de grande interesse na teoria qualitativa de sistemas dinâmicos. Nesta
dissertação, estudamos este tópico em sistemas dinâmicos descontínuos. Vamos fazer esta
análise em sistemas de equações diferenciais de Liénard, permitindo uma linha de descontinuidade.
Além disso, vamos apresentar o conhecido método Averaging de primeira
ordem, em primeiro lugar na sua versão clássica, isto é, para campos de classe pelo menos
C2, depois apresentaremos também a versão generalizada, para sistemas diferenciais
definidos por partes. Como resultado, fazemos uso desta ferramenta para determinar o
número de ciclos limites que podem bifurcar de um centro planar, dentro da classe de
equações diferenciais de Liénard.
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Vibration-Based Energy Harvesting with Essential Non-LinearitiesTriplett, Angela Lynn 02 December 2011 (has links)
No description available.
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