Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2286
Title: Study of nonlinear phenomena in switching DC/DC converters
Authors: Iu, Herbert Ho-ching
Keywords: DC-to-DC converters
Switching circuits
Electric current converters
Power electronics
Nonlinear theories
Hong Kong Polytechnic University -- Dissertations
Issue Date: 2000
Publisher: The Hong Kong Polytechnic University
Abstract: This thesis studies some nonlinear phenomena such as bifurcation and chaos in DC/DC switching converters. Five phases of investigations are described. The first phase reviews the existing tools for analyzing nonlinear systems that are helpful to the investigation of nonlinear phenomena in power electronic circuits. Some of these existing tools are employed to study the nonlinear behaviour of power electronic circuits in the subsequent phases. The second phase focuses on the analysis of bifurcation behaviour of parallel-connected DC/DC converters under a master-slave current sharing scheme. An iterative discrete-time map and its Jacobian are established to predict the onset of period-doubling or Neimark-Sacker bifurcation. Both parallel-connected buck converters and boost converters are studied. The third phase studies an autonomous free-running Cuk converter under a hysteretic current-mode control. Hopf bifurcation is observed, for the first time, in this kind of autonomous power electronic circuits. The method of state-space averaging is employed to predict the occurrence of such bifurcation. Extensive simulations and experiments confirm the predicted results. A typical bifurcatioii sequence from stable fixed points to chaos, via limit cycles and quasi-periodic orbits, is demonstrated. The fourth phase investigates the possibility of synchronization of two chaotic autonomous free-running Cuk converters. With a particular capacitor voltage as driving signal, synchronization is found possible. Averaged state equations and conditional Lyapunov exponents are used to predict the possibility of synchronization while computer simulations and PSPICE simulations provide the verification. The last phase gives suggestions for future research.
Description: xvi, 145 leaves : ill. ; 30 cm.
PolyU Library Call No.: [THS] LG51 .H577P EIE 2000 Iu
URI: http://hdl.handle.net/10397/2286
Rights: All rights reserved.
Appears in Collections:Thesis

Files in This Item:
File Description SizeFormat 
b15433961_link.htmFor PolyU Users 179 BHTMLView/Open
b15433961_ir.pdfFor All Users (Non-printable)6.11 MBAdobe PDFView/Open
Show full item record

Page view(s)

534
Last Week
3
Last month
Checked on Mar 26, 2017

Download(s)

616
Checked on Mar 26, 2017

Google ScholarTM

Check



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.