Real-time parameter estimation of DC-DC converters using a self-tuned kalman filter

Mohamed Ahmeid*, Matthew Armstrong, Shady Gadoue, Maher Al-Greer, Petros Missailidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To achieve high-performance control of modern dc-dc converters, using direct digital design techniques, an accurate discrete model of the converter is necessary. In this paper, a new parametric system identification method, based on a Kalman filter (KF) approach is introduced to estimate the discrete model of a synchronous dc-dc buck converter. To improve the tracking performance of the proposed KF, an adaptive tuning technique is proposed. Unlike many other published schemes, this approach offers the unique advantage of updating the parameter vector coefficients at different rates. The proposed KF estimation technique is experimentally verified using a Texas Instruments TMS320F28335 microcontroller platform and synchronous step-down dc-dc converter. Results demonstrate a robust and reliable real-time estimator. The proposed method can accurately identify the discrete coefficients of the dc-dc converter. This paper also validates the performance of the identification algorithm with time-varying parameters, such as an abrupt load change. The proposed method demonstrates robust estimation with and without an excitation signal, which makes it very well suited for real-time power electronic control applications. Furthermore, the estimator convergence time is significantly shorter compared to many other schemes, such as the classical exponentially weighted recursive least-squares method.

Original languageEnglish
Pages (from-to)5666-5674
Number of pages9
JournalIEEE Transactions on Power Electronics
Issue number7
Early online date7 Sept 2016
Publication statusPublished - 7 Sept 2016

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  • DC-DC converter
  • Kalman filter (KF)
  • parameter estimation
  • recursive least-squares (RLS) method
  • system identification


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