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Hybrid modeling of quasi-resonant converters: A piecewise affine approach

Hasanisaadi, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1109/PEDSTC53976.2022.9767258
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2022
  4. Abstract:
  5. DC-DC quasi-resonant converters (QRC) have the advantage of reducing switching losses and electromagnetic interference (EMI) which are the main disadvantages of high frequency power converters. The control and stabilization of these converters have always been a challenge. Traditionally, the dynamical model of the QRC is obtained using state space averaging followed by linearization about an operating point. The major flaw of this method is that state variables have large variations; thus, the linearized averaged model is not valid. Therefore, it is necessary to obtain a more precise model for the aim of stability analysis and controller design. Due to semiconductors switching, QRCs are inherently hybrid systems consisting of continuous and discrete states. Thus, they can be modeled as hybrid systems and controller design and stability analysis can be performed using theorems developed for such systems. In this paper, a dynamic Voltage-Controlled Oscillator (VCO) is proposed, so that the overall system composed of this VCO and QRC will be a piecewise affine (PWA) system. The simulation results on a half¬wave zero-current switching quasi-resonant buck converter (HW-ZCS-QRC) show that the proposed model is precise. According to this model, a linear controller is designed and the stability of the closed-loop system is investigated. © 2022 IEEE
  6. Keywords:
  7. Hybrid systems ; Quasi resonant converters ; Circuit oscillations ; Closed loop systems ; Controllers ; DC-DC converters ; Electric current regulators ; Electromagnetic pulse ; Hybrid systems ; Linear control systems ; Linearization ; System stability ; Variable frequency oscillators ; Controller designs ; Dynamical modeling ; Electromagnetics ; High frequency power converter ; Hybrid model ; Piecewise affine systems ; Piecewise affines ; Quasi-resonant converter ; Stability analyze ; Switching loss ; Oscillistors
  8. Source: 13th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2022, 1 February 2022 through 3 February 2022 ; 2022 , Pages 448-454 ; 9781665420433 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/9767258