Accurate state estimation in DC-DC converters using a Proportional-Integral Observer (PIO)

Document Type

Conference Proceeding

Publication Date

1-1-2014

Publication Title

IEEE International Symposium on Industrial Electronics

First Page

1304

Last Page

1309

Abstract

This paper focuses on state estimation of DC-DC converters in the presences of a biased duty-cycle which is very common in practice. It is shown that the commonly used Proportional (P-) observer fails to estimate the state of the converter when an unknown biased duty-cycle is present. To address this issue, a Proportional-Integral (PI-) observer is proposed, and its design is formulated as a H∞/L2 problem. A sufficient condition is derived by using the Lyapunov stability theorem and linear-matrix-inequality (LMI) design tool, guaranteeing the convergence of the observer's estimation error. The effectiveness and robustness of the proposed technique is verified and is compared with the P-observer observer through an experimental test on a step-down buck converter. © 2014 IEEE.

DOI

10.1109/ISIE.2014.6864803

ISBN

9781479923991

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