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Effectiveness Assessment of a Nanocrystalline Sleeve Ferrite Core Compared with Ceramic Cores for Reducing Conducted EMI

1
Department of Electronic Engineering, University of Valencia, 46100 Burjassot, Spain
2
Würth Elektronik eiSos GmbH & Co. KG, 74638 Waldenburg, Germany
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(7), 800; https://doi.org/10.3390/electronics8070800
Received: 21 June 2019 / Revised: 12 July 2019 / Accepted: 15 July 2019 / Published: 17 July 2019
(This article belongs to the Section Microwave and Wireless Communications)
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Abstract

The interconnection of different electronic devices or systems through cables is becoming more difficult due to the hard restrictions related to electromagnetic compatibility (EMC) in order to comply with requirements. Therefore, the use of EMC components is a good solution to manage the problems associated with the filtering of electromagnetic interference (EMI) in cables and to pass the compliance test. In this sense, sleeve ferrite cores become a very interesting solution since they can be set around a wire and, hence, they provide an effective solution against EMI without having to redesign the electronic circuit. This contribution is focused on the characterization of the performance of a sleeve ferrite core based on a novel nanocrystalline (NC) novel material for EMI suppression and comparing it to the most conventional ceramic ferrite cores such as MnZn and NiZn. The research highlights the suitability of an NC novel component in terms of its magnetic properties to reduce EMI within the conducted emissions range. This range is generally defined by the International Special Committee on Radio Interference (CISPR) test standards frequency band that covers from 150 kHz up to 30 MHz (108 MHz in the case of CISPR 25). First, this study presents a description of the main parameters that define the behavior of NC and ceramic cores and, secondly, by analyzing the data obtained from experimental procedures, it is possible to directly determine the insertion loss parameter. Hence, this characterization procedure is used to obtain the performance of NC material compared to the conventional sleeve ferrite core compositions employed to filter the interferences in this problematic frequency range. As can be deduced from the results obtained, an NC sleeve ferrite core provides the best performance in terms of EMI filtering within a significant frequency range between 100 kHz and 100 MHz. View Full-Text
Keywords: nanocrystalline (NC); sleeve ferrite core; cable ferrite; cable filtering; electromagnetic interference (EMI) suppression; conducted emissions; relative permeability; impedance; insertion loss nanocrystalline (NC); sleeve ferrite core; cable ferrite; cable filtering; electromagnetic interference (EMI) suppression; conducted emissions; relative permeability; impedance; insertion loss
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Suarez, A.; Victoria, J.; Torres, J.; Martinez, P.A.; Alcarria, A.; Martos, J.; Garcia-Olcina, R.; Soret, J.; Muetsch, S.; Gerfer, A. Effectiveness Assessment of a Nanocrystalline Sleeve Ferrite Core Compared with Ceramic Cores for Reducing Conducted EMI. Electronics 2019, 8, 800.

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