Presentation Details
| Bifurcation and Chaos in Single-Stage Power Factor Correction AC-DC Converters Ammar N Natsheh1, Bereket K Bedada1, Mihretab A Tilahun1, Nuhamin D Gemeda1, Yassine Benachour1, Sohad Abu-Elzait2. 1Higher Colleges of Technology, Dubai Women's College, Dubai, United Arab Emirates.2Appalachian State University, Boone, NC, USA |
Abstract
Single-stage AC–DC converters with inherent power factor correction (PFC) are widely used in high-density power electronic applications due to their reduced component count and high efficiency. Among these topologies, the Bi-flyback converter integrates flyback and boost functionalities within a single power stage, enabling effective output voltage regulation over wide input voltage ranges. However, when operated under current-mode control, the nonlinear switching behavior of the converter may give rise to complex dynamical phenomena, including subharmonic oscillations, bifurcations, and chaotic behavior, which can adversely affect system performance and reliability. This paper presents a comprehensive nonlinear dynamic analysis of a current-mode controlled Bi-flyback AC–DC converter using a high-fidelity physics-based modeling approach developed in MATLAB/Simulink with Simscape Electrical. By varying the reference current, the converter is shown to transition through distinct operating regimes, including period-1, higher-order periodic, and chaotic responses. These behaviors are investigated using time-domain waveforms, phase-plane trajectories, and bifurcation analysis. In addition, a nonlinear control strategy is implemented within the Simscape framework to suppress chaotic oscillations and restore stable periodic operation. Simulation results demonstrate the effectiveness of the proposed approach and highlight the importance of physics-based modeling for accurately predicting nonlinear instabilities in high-frequency single-stage PFC converters.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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