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Document Type : Latin Dissertation
Language of Document : English
Record Number : 151698
Doc. No : ET23490
Main Entry : Herbert Ho-Ching Iu
Title Proper : This reproduction is the best copy available
Note : This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract : This thesis studies some nonlinear phenomena such as bifurcation and chaos inDC/DC switching converters. Five phases of investigations are described. Thefirst phase reviews the existing tools for analyzing nonlinear systems that arehelpful to the investigation of nonlinear phenomena in power electronic circuits.Some of these existing tools are employed to study the nonlinear behaviour ofpower electronic circuits in the subsequent phases. The second phase focuseson the analysis of bifurcation behaviour of pardel-connected DC/DC convertersunder a master-slave current sharing scheme. An iterative discrete-time map andits Jacobian are established to predict the onset of period-doubling or Neimark-Sacker bifurcation. Both parallel-connected buck converters and boost convertersare studied. The third phase studies an autonomous freerunning ~ u k converterunder a hysteretic current-mode control- Hopf bifurcation is observed, for thefirst time, in this kind of autonomous power electronic circuits. The method ofstate-space averaging is employed to predict the occurrence of such bifurcation.Extensive simulations and experiments confinn the predicted results. A typicalbifurcatiuri sequence from stable fixed points to chaos, via limit cycles 2nd quasi-periodic orbits, is demonstrated. The fourth phase investigates the possibility ofsynchronization of two chaotic autonomous free-running ~ u k converters. With aparticular capacitor voltage as driving signal, synchronization is found possible.Averaged state equations and conditional Lyapunov exponents are used to pre-dict the possibility of synchronization while computer simulations and PSPICEsimulations provide the verification. The last phase gives suggestions for futureresearch.......-....,....-...,..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject : Electericl tess
: برق
electronic file name : TL46731.pdf
Title and statement of responsibility and : This reproduction is the best copy available [Thesis]
 
 
 
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