Characterization of Non-linear Inductors Including Thermal Effects for
Power Applications

D. Scirè1, S. Rosato, G. Lullo and G. Vitale




This paper focuses on the behavior of non-linear inductors employed in DC/DC switching converters considering the effects due to variations of both current and temperature. The characterization of the inductors is performed by a buck converter operated to stimulate the inductor under test by a constant current with superimposed a large signal. The measurements are carried out for several temperature values of the inductor. Data are automatically collected by a novel virtual instrument developed by the authors in LabVIEW® environment, aiming to obtain a polynomial based analytical model. The deep knowledge of the inductor model allows its design to be optimized improving the
power density of the converter.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 16)
Pages: 728.734 Date of Publication: 2018/04/20
ISSN: 2172-038X Date of Current Version:2018/03/23
REF: 446-18 Issue Date: April 2018
DOI:10.24084/repqj16.446 Publisher: EA4EPQ

Authors and affiliations

D. Scirè1, S. Rosato1, G. Lullo1, and G. Vitale2
1. Departement of Engineering, University of Palermo, Italy
2. Institute of High Performance and Networking (ICAR), National Research Council (CNR), Palermo, Italy

Key words

Inductor modelling, partial saturation, roll-off region, losses and temperature rise, DC/DC converter.


[1] G. Vitale, "Energy saving by power electronics: toward a new concept of renewable source", Renewable Energy &
Power Quality Journal , vol. May 2016, n. 14, pp. 160001-160010, 2016.
[2] N. Mohan, T. M. Undeland and W. P. Robbins, Power Electronics: Converters, Applications, and Design, 3rd
Edition, Wiley, 2002.
[3] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, Second Edition, Springer, 2001.
[4] G. Di Capua and N. Femia, "A Novel Method to Predict the Real Operation of Ferrite Inductors Witth Moderate
Saturation in Switching Power Supply Applications" IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 31, n.
3, 2016.
[5] G. Lullo, D. Scire and G. Vitale, "Non-linear inductor modelling for a DC/DC Buck converter", Renewable
Energy and Power Quality Journal (RE&PQJ), n. 15, 2017.
[6] L. Milner and G. A. Rincon-Mora, "Small saturating inductors for more compact switching power supplies"
IEEJ Transactions on Electrical and Electronic Engineering, vol. 7, n. 1, pp. 69-73, 2012.
[7] D. Scire, G. Vitale and G. Lullo, "Design and realization of a DC/DC converter with Inductor in partial saturation" in
49th Annual Meeting of Associazione Societa' Italiana di Elettronica (SIE), Palermo, Italy, 2017.
[8] K. Detka, K. Gorecki and J. Zar.bski, "Modeling Single Inductor DC.DC Converters With Thermal Phenomena in
the Inductor Taken Into Account" IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 32, n. 9, pp. 7025-7032, 2017.
[9] K. Gorecki and M. Godlewska, "Electrothermal Model of Ferromagnetic Cores", PRZEGL.D ELEKTROTECHNICZNY, vol. 91, n. 3, pp. 161-165, 2015.
[10] W. Lee, Y.-K. Hong, J. Park, J. Lee, I.-S. Baek, N.-P. Hur, W.-M. Seong and S.-O. Park "A Simple Wireless Power
Charging Antenna System: Evaluation of Ferrite Sheet", IEEE TRANSACTIONS ON MAGNETICS, vol. 53, n. 7, 2017.
[11] T. Fukami, K. Motoki, R. Kirihata, K. Shima, M. Koyama, T. Mori and M. Nakano, "An Electromagnet-Assisted
Ferrite Magnet Motor", IEEE TRANSACTIONS ON MAGNETICS, vol. 53, n. 11, 2017.
[12] N. Duan, W. Xu, S. Wang, J. Zhu, R. Qu and a. S. Jia, "A Temperature-Dependent Hysteresis Model for Soft
Ferrites", IEEE TRANSACTIONS ON MAGNETICS, vol. 53, n. 6, 2017.
[13] G. D. Capua, N. Femia, K. Stoyka, M. Lodi, A. Oliver e M. Storace, "Ferrite Inductor Models for Switch-Mode Power
Supplies Analysis and Design", in 14th International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD 2017), Giardini Naxos - Taormina, Italy, 2017.
[14] S. Rosato, G. Vitale e G. Lullo, "Characterization of inductors in partial saturation for SMPS applications", in
49th Annual Meeting of Associazione Societa' Italiana di Elettronica (SIE), Palermo, Italy, 2017.
[15] Panasonic Corporation, "Panasonic Chocke Coils - Power Inductors / Multilayer type - Type: ELGTEA" 1 September
2012. [Online]. Available:
[16] EPCOS, áInductors - General Technical Informationâ October 2008. [Online]. Available:
[17] Panasonic Industry Europe, "Power Choke Coils for Automotive Applications" [Online]. Available:
[18] National Instruments Corporation, "Event-Driven Programming in LabVIEW", 20 July 2008. [Online].