Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Z-domain modeling of peak current mode control for full-bridge DC-DC buck converters

  • Wang, Xiaohong (School of Automation Science and Engineering, South China University of Technology) ;
  • Huang, Qisong (School of Automation Science and Engineering, South China University of Technology) ;
  • Zhang, Bo (School of Automation Science and Engineering, South China University of Technology) ;
  • Chen, Di (School of Automation Science and Engineering, South China University of Technology) ;
  • Guan, Quanxue (Department of Electrical and Electronic Engineering, University of Nottingham)
  • Received : 2020.08.01
  • Accepted : 2020.09.11
  • Published : 2021.01.20
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Abstract

Traditional local-averaged state-space modeling for peak current mode (PCM) controls fails to explain the subharmonic oscillation phenomenon when the spectrum is higher than half of the switching frequency. To address this problem, this paper presents a small-signal modeling method in the z-domain, and builds a discrete linear model for the current loop of a full-bridge DC-DC converter. This discrete model is converted into a second-order continuous model that is able to represent the system performance with a wider frequency range. A frequency-domain analysis shows that this model can be used to explain the subharmonic oscillations and unstable characteristics. This provides an engineering guideline for the practical design of slope compensation. The effectiveness of the proposed modeling method has been verified by simulation and experimental results with a prototype working in the Buck mode.

Keywords

Acknowledgement

This work was supported in part by the Science and Technology Major Project of Guangdong Province under Grant 2016B090911003, Science and Technology Major Project of Guangzhou under Grant 201902010066 and the National Natural Science Foundation of China under Grant 51707042.

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