Open AccessSwitching frequency regulation in sliding mode control for synchronous buck converter
Author(s) -
Liu Songbin,
Feng Zhiyuan,
Cai Yu
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8831
Subject(s) - control theory (sociology) , differentiator , switching frequency , inductor , buck converter , automatic frequency control , hysteresis , converters , sliding mode control , voltage , computer science , nonlinear system , physics , engineering , control (management) , bandwidth (computing) , telecommunications , electrical engineering , artificial intelligence , quantum mechanics
This study aims to control the switching frequency of synchronous buck (SR‐buck) converters using the second‐order sliding mode controller by prescribed control law. The relation between position of the switching line and the switching frequency is discussed at stable state. On‐resistance of MOSFET and ESR of inductor and capacitor are taken into account. A hysteresis method is proposed to change the position of switching line to control the switching frequency, and the equation of calculating hysteresis width is deduced. The differentiator with the discrete super‐twisting is designed. Numerical simulation results under rated working condition, load disturbance, voltage perturbation, and switching frequency variation have been presented. Switching frequency variation is discussed and can be controlled accurately when the working condition is fixed. It validates the effectiveness and feasibility of the method proposed in this study.