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Modeling the Buck Converter from Measurements of Its Harmonic Transfer Function

In: Realization and Model Reduction of Dynamical Systems

Author

Listed:
  • Sanda Lefteriu

    (IMT Lille Douai, Insitut Mines-Télécom, Center for Digital Systems)

Abstract

Buck converters are DC-DC converters which provide a step-down of the input voltage produced by the supply to the output voltage delivered to the load. They contain two semiconductor devices (typically a transistor and a diode) acting as switches which open and close periodically, together with an output filter in the form of an RLC circuit. These considerations render the buck converter as a periodically switched linear system. Thanks to the periodic nature, the Harmonic Transfer Function (HTF) is a suitable tool for modeling the buck converter. This chapter shows how to identify a frequency domain model for the buck converter from measurements of the HTF through the Loewner framework. The measurements are obtained by computing the Fast Fourier Transform (FFT) of the outputs in a small signal analysis. The model corresponds to a single-input multiple-output system with the the number of outputs given by the desired number of harmonics.

Suggested Citation

  • Sanda Lefteriu, 2022. "Modeling the Buck Converter from Measurements of Its Harmonic Transfer Function," Springer Books, in: Christopher Beattie & Peter Benner & Mark Embree & Serkan Gugercin & Sanda Lefteriu (ed.), Realization and Model Reduction of Dynamical Systems, pages 175-196, Springer.
    • Handle: RePEc:spr:sprchp:978-3-030-95157-3_10
    DOI: 10.1007/978-3-030-95157-3_10
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