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Modeling and Control of Quasi-Resonant Converters using Hybrid Systems

Hasani Saadi, Mohammad Hesam | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48379 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. A DC-DC quasi-resonant converter has the advantage of reducing switching losses and electromagnetic interference which are the main limitations of high frequency power converters. The conventional model of the quasi-resonant converter is derived using state space averaging followed by linearization about an operating point. Nevertheless, the state variables have large variations and the validity of the linearized averaged model is violated. Therefore it is essential to investigate the stability of quasi-resonant converter using a more precise model. Quasi-resonant converters are intrinsically hybrid systems consisting of discrete input and continuous states. In this paper the discrete control signal of the QRC is generated by a novel voltage-controlled oscillator (VCO). The overall system constructed by cascading the VCO and quasi-resonant converter is modeled by a widely used class of hybrid systems which is called polyhedral piecewise affine systems. Based on this hybrid model a linear controller is designed for quasi-resonant converter and the stability of the closed loop system is investigated by use of the piecewise quadratic stability theorem. The simulation results on a half-wave zero-current switching quasi-resonant buck converter show the effectiveness of the proposed model
  9. Keywords:
  10. Piecewise Affine System ; Quasi-Resonant Converter ; Hybrid System ; Modeling

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