An Improved Passivity-Based Control to Buck Dc-Dc Converter

DOI

10.2991/msam-15.2015.44How to use a DOI?

Keywords

passivity; feedback equivalence; buck converter; nonlinear model

Abstract

For the nonlinear characteristic of buck dc-dc converter and high demand of dynamic quality and robustness for the converter, a passivity-based control with an adjustable parameter for buck converter is proposed. Based on the nonlinear error model of buck converter, a feedback equivalence system is obtained by the way of coordinate transformation. According to passive theory, the feedback equivalent system is to be passive by adding feedback appropriately. The proof of the passivity of closed-loop system is given. And a Lyapunov function is constructed to guarantee asymptotic stability of closed-loop system. Finally, a passive feedback control law for buck converter is derived. Simulate by designing control circuit in Pspice environment, and the simulative results show that the stability of output voltage is effectively controlled by the proposed control method. The controller has very strong robustness for disturbance caused by load change and input voltage change. And the system dynamic response is improved by adjusting the coefficient of the control law.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yanhua Xian
AU  - Xiaoshu Luo
PY  - 2015/08
DA  - 2015/08
TI  - An Improved Passivity-Based Control to Buck Dc-Dc Converter
BT  - Proceedings of the 2015 International Conference on Modeling, Simulation and Applied Mathematics
PB  - Atlantis Press
SP  - 193
EP  - 197
SN  - 1951-6851
UR  - https://doi.org/10.2991/msam-15.2015.44
DO  - 10.2991/msam-15.2015.44
ID  - Xian2015/08
ER  -