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Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Author

Listed:
  • Daniele Scirè

    (Department of Engineering, University of Palermo, 90128 Palermo, Italy)

  • Gianpaolo Vitale

    (Institute for High Performance Computing and Networking (ICAR), National Research Council (CNR), 90146 Palermo, Italy)

  • Marco Ventimiglia

    (Department of Engineering, University of Palermo, 90128 Palermo, Italy)

  • Giuseppe Lullo

    (Department of Engineering, University of Palermo, 90128 Palermo, Italy)

Abstract

The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decrease in the inductance can be noticed. This allows using a smaller magnetic core, increasing the power density of the converter. On the other hand, a detailed description of the magnetization curve including the temperature is required. Since this information is often not included in the inductor’s datasheets, this paper shows how to identify the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig was developed. It consists of a switching converter that encompasses the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core temperatures up to 105 °C. The magnetic core was then characterized by the saturation current vs. inductance, obtaining an expression for the whole family of inductors sharing the same core. Finally, we experimentally analyzed the thermal transient of the inductors in operating conditions, confirming the fundamental role of the temperature in changing the current profiles and the core saturation condition.

Suggested Citation

  • Daniele Scirè & Gianpaolo Vitale & Marco Ventimiglia & Giuseppe Lullo, 2021. "Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS," Energies, MDPI, vol. 14(13), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:3924-:d:585787
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    References listed on IDEAS

    as
    1. Sarah Saeed & Ramy Georgious & Jorge Garcia, 2020. "Modeling of Magnetic Elements Including Losses—Application to Variable Inductor," Energies, MDPI, vol. 13(8), pages 1-19, April.
    2. Krzysztof Górecki & Kalina Detka, 2019. "Influence of Power Losses in the Inductor Core on Characteristics of Selected DC–DC Converters," Energies, MDPI, vol. 12(10), pages 1-15, May.
    3. Yitao Liu & Shan Yin & Xuewei Pan & Huaizhi Wang & Guibin Wang & Jianchun Peng, 2017. "Effects of Nonlinearity in Input Filter on the Dynamic Behavior of an Interleaved Boost PFC Converter," Energies, MDPI, vol. 10(10), pages 1-14, October.
    4. Xianxu Huo & Ke Xu & Ruixin Liu & Xi Chen & Zhanchun Li & Haiyun Yan, 2019. "A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications," Energies, MDPI, vol. 12(15), pages 1-25, July.
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