Measurement method of the complex magnetic permeability of ferrites in high frequency

Cuellar, Carlos; Tan, Wenhua; Margueron, Xavier; Bénabou, Abdelkader; Idir, Nadir

doi:10.1109/i2mtc.2012.6229697

Cited by 36 publications

(23 citation statements)

References 7 publications

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“…There is also a capacitance component that represents the dielectric effects of the ferrite magnetic material. This appears in the bandwidth above the , where the inductive component of the permeability becomes negative [13,37]. As can be observed in Figure 3, this stray capacitance due to the magnetic material is noted beyond 1.8 MHz and 85.1 MHz and 282.7 MHz in case of MnZn, NC and NiZn cores, respectively.…”

Section: Magnetic Propertiesmentioning

confidence: 78%

“…One of the most important parameters that defines the ability of a material to absorb electromagnetic interferences is the relative permeability (µ r ) [13]. The permeability relates the magnetic flux density of a certain magnetic field in a defined medium, so that when a sleeve ferrite core is placed around a certain cable, the magnetic flux is concentrated in it.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…Therefore, there is a balance between the number of turns and winding capacitance, because a higher number of turns implies a worse performance at high frequencies. Nevertheless, increasing the number of turns N, it is possible to increase to obtain a higher inductance L F value, but at the same time, the stray capacitance C F increases [13]. This last fact could generate a self-resonance (SRF) at a certain frequency.…”

Section: Impedance and Phase Descriptionmentioning

confidence: 99%

“…In order to validate the impedance used to characterize the novel NC and ceramic sleeve ferrite cores, in Section 4, this data is compared with the impedance calculated from the relative permeability through the quasi-static model from the real and imaginary permeability components and the dimension of the sleeve ferrite core [13]. Generally, this model can be used for evaluating cores up to the SFR, since beyond this frequency value, the static magnetic flux distribution can fluctuate.…”

Section: Impedance and Phase Descriptionmentioning

confidence: 99%

“…These components are widely used in EMI filtering applications because they are usually applied to be set on power cables or peripheral cables of electronic devices in order to prevent electromagnetic disturbance that could be propagated along the wire, as shown in Figure 1 [10,11]. This filtering method enables limiting of the conducted emissions [12,13] and can be applied in electronics and telecommunications elements [2,7,14]. Therefore, when a disturbance current is flowing in the peripheral and/or power wires connected to the device, the manufacturer usually decides to attach a sleeve ferrite core to encircle these cables.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.Electronics 2019, 8, 800 2 of 21 circuit. The most common sources of these interferences include natural ones (such as atmospheric electrical phenomena), power lines, auto ignition or radio frequency (RF) interference.In terms of the kind of disturbance that is transmitted, EMI is divided into two categories: conducted and radiated emissions; regarding the way the electromagnetic field is propagated. In the case of radiated EMI, it is caused by induction whereas conducted EMI is generated by physical contact of conductors. Thus, in the low frequency range EMI is generally emitted via conduction and, in the high frequency region via radiation. Likewise, conducted EMI can be classified into two kind of currents in terms of different directions of leading: differential mode (DM) and common mode (CM) [3]. In the correct working of a circuit, a differential current is designed to flow in order to obtain a clear signal. When opposing currents are created and flow in the same direction as the intended current, the differential intended currents are canceled. In CM, currents flow in both conductors in the same direction and are not suppressed as ...

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Section: Magnetic Propertiesmentioning

confidence: 78%

Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Impedance and Phase Descriptionmentioning

confidence: 99%

Section: Impedance and Phase Descriptionmentioning

confidence: 99%