Z-domain modeling of peak current mode control for full-bridge DC-DC buck converters
| Autor: | Huang Qisong, Xiaohong Wang, Bo Zhang, Di Chen, Quanxue Guan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Buck converter
Computer science Continuous modelling 020209 energy 020208 electrical & electronic engineering Mode (statistics) Linear model DC-DC converter Slope compensation 02 engineering and technology Domain model Z-domain modeling method Compensation (engineering) Control and Systems Engineering Control theory Power electronics 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Peak current mode control Current loop Subharmonic oscillation |
| ISSN: | 1598-2092 2093-4718 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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