scholarly journals Characterization of Nanocrystalline Cores for EMI Suppression in Cables

2021 ◽  
Author(s):  
Adrian Suarez ◽  
Jorge Victoria ◽  
Jose Torres ◽  
Pedro A. Martinez ◽  
Andrea Amaro ◽  
...  
Keyword(s):  
Electromagnetic Compatibility ◽  
Power Network ◽  
Electronic Products ◽  
Permanent Damage ◽  
Radiated Emissions ◽  
Different Dimensions ◽  
Analog Systems

Electromagnetic interferences (EMI) can cause different kinds of problems in digital and analog systems, leading to malfunctions, system reboots, or even permanent damage to the system if this is not adequately designed or protected. Nowadays, most electronic products are connected to the main power network or are designed to be interconnected with others through cables. These cable interconnections are becoming more difficult due to the rigid restrictions related to the accomplishment of electromagnetic compatibility (EMC) compliance. When the cables of a system represent an EMI source, it cannot pass the conducted or radiated emissions test. A widely used technique to reduce these problems is applying an EMI suppressor such as a sleeve core. This EMI suppressor provides selective attenuation of undesired interference components that the designer may wish to suppress, and it does not significantly affect the intended signal. This contribution focuses on analyzing different nanocrystalline (NC) EMI suppressors’ performance intended for attenuating interferences in cables. Some NC novel samples are characterized and compare to MnZn and NiZn cores to determine this novel material’s effectiveness compared to the conventional ceramic solutions by analyzing samples with different dimensions.

scholarly journals Critical Review of EMC Standards for the Measurement of Radiated Electromagnetic Emissions from Transit Line and Rolling Stock

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 759
Author(s):  
Andrea Mariscotti
Keyword(s):  
Time Distribution ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Transportation Systems ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Intrinsic Variability ◽  
Statistical Characterization ◽  
Electromagnetic Emissions

Accurate and comprehensive methods for the assessment of radiated electromagnetic emissions in modern electric transportation systems are a necessity. The characteristics and susceptibility of modern victim signaling and communication radio services, operating within and outside the right-of-way, require an update of the measurement methods integrating or replacing the swept frequency technique with time domain approaches. Applicable standards are the EN 50121 (equivalent to the IEC 62236) and Urban Mass Transport Association (UMTA) with additional specifications from project contracts. This work discusses the standardized methods and settings, and the representative operating conditions, highlighting areas where improvements are possible and opportune (statistical characterization of measurement results, identification and distinction of emissions and line resonances, and narrowband and broadband phenomena). In particular for the Electromagnetic Compatibility (EMC) assessment with new Digital Communication Systems, the characterization of time distribution of spectral properties is discussed, e.g., by means of Amplitude Probability Distribution and including time distribution information. The problem of determination of site and setup uncertainty and repeatability is also discussed, observing on one hand the lack of clear indications in standards and, on the other hand, the non-ideality and intrinsic variability of measurement conditions (e.g., rolling stock operating conditions, synchronization issues, and electric arc intermittence).

An Investigation of the Distribution of Electric Potential and Space Charge in a Silicon Nanowire

2014 ◽  
Vol 69 (10-11) ◽  
pp. 597-605 ◽  
Author(s):  
A. Wesam Al-Mufti ◽  
Uda Hashim ◽  
Md. Mijanur Rahman ◽  
Tijjani Adam
Keyword(s):  
Finite Element Method ◽  
Space Charge ◽  
Electric Potential ◽  
Silicon Nanowire ◽  
Electrical Potential ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Simulation Experiments ◽  
Different Dimensions

AbstractThe distribution of electric potential and space charge in a silicon nanowire has been investigated. First, a model of the nanowire is generated taking into consideration the geometry and physics of the nanowire. The physics of the nanowire was modelled by a set of partial differential equations (PDEs) which were solved using the finite element method (FEM). Comprehensive simulation experiments were performed on the model in order to compute the distribution of potential and space charge. We also determined, through simulation, how the characteristic of the nanowire is affected by its dimensions. The characterization of the resulting nanowire, calculated by COMSOL Multiphysics, shows different dimensions and their effect on space charge and electrical potential

scholarly journals Performance Study of Split Ferrite Cores Designed for EMI Suppression on Cables

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1992
Author(s):  
Adrian Suarez ◽  
Jorge Victoria ◽  
Jose Torres ◽  
Pedro A. Martinez ◽  
Antonio Alcarria ◽  
...  
Keyword(s):  
Electromagnetic Compatibility ◽  
Electronic Device ◽  
Fem Simulation ◽  
Power Cables ◽  
Performance Study ◽  
External Power Source ◽  
External Power ◽  
Cable Assembly ◽  
Wired Communication

The ideal procedure to start designing an electronic device is to consider the electromagnetic compatibility (EMC) from the beginning. Even so, EMC problems can appear afterward, especially when the designed system is interconnected with external devices. Thereby, electromagnetic interferences (EMIs) could be transmitted to our device from power cables that interconnect it with an external power source or are connected to another system to establish wired communication. The application of an EMI suppressor such as a sleeve core that encircles the cables is a widely used technique to attenuate EM disturbances. This contribution is focused on the characterization of a variation of this cable filtering solution based on openable core clamp or snap ferrites. This component is manufactured by two split parts pressed together by a snap-on mechanism which turns this into a quick, easy to install solution for reducing post-cable assembly EMI problems. The performance of three different materials, including two polycrystalline (MnZn and NiZn) materials and nanocrystalline (NC) solution, are analyzed in terms of effectiveness when the solid sleeve cores are split. The possibility of splitting an NC core implies an innovative technique due to the brittleness of this material. Thus, the results obtained from this research make it possible to evaluate this sample’s effectiveness compared to the polycrystalline ones. This characterization is carried out by the introduction of different gaps between the different split-cores and analyzing their behavior in terms of relative permeability and impedance. The results obtained experimentally are corroborated with the results obtained by a finite element method (FEM) simulation model with the aim of determining the performance of each material when it is used as an openable core clamp.

Gibt es so etwas wie intellektuelle Toleranz?

2020 ◽  
Vol 97 (2) ◽  
pp. 319-342
Author(s):  
Dominik Balg
Keyword(s):  
Abstract Characterization ◽  
Normative Evaluation ◽  
Different Dimensions

In this article, it will be argued that tolerance is not necessarily a political or ethical, but rather an abstract attitude that can be applied to many different dimensions of normative evaluation. More specifically, it will be argued that there are genuinely intellectual forms of tolerance that are epistemically motivated and that need to be assessed on purely epistemic grounds. To establish this claim, an abstract characterization of tolerance will be applied to the epistemic phenomenon of disagreement in order to develop a specific conception of tolerance that picks out a genuinely intellectual attitude towards recognized disagreement. Since the attitude that is picked out by this conception is very popular and widespread, an epistemology of tolerance would be of great significance to our intellectual practice.

scholarly journals Complex Locations of Equivalent Dipoles for Improved Characterization of Radiated Emissions

2014 ◽  
Vol 56 (5) ◽  
pp. 1087-1094 ◽  
Author(s):  
Chijioke S. Obiekezie ◽  
David. W. P. Thomas ◽  
Angela Nothofer ◽  
Steve Greedy ◽  
Luk R. Arnaut ◽  
...  
Keyword(s):  
Radiated Emissions

EMC characterization of SMPS devices: circuit and radiated emissions model

1996 ◽  
Vol 38 (3) ◽  
pp. 300-309 ◽  
Author(s):  
G. Antonini ◽  
S. Cristina ◽  
A. Orlandi
Keyword(s):  
Radiated Emissions

scholarly journals Experimental Research on Textile and Non-Textile Materials with Applications to Ensure Electromagnetic and Bio-Electromagnetic Compatibility

2019 ◽  
Vol 25 (3) ◽  
pp. 13-18
Author(s):  
Octavian Baltag ◽  
Alina Lacrămioara Apreutesei ◽  
Georgiana Roșu ◽  
George Mihai
Keyword(s):  
Composite Structures ◽  
Electromagnetic Compatibility ◽  
Metal Structure ◽  
Cellular Systems ◽  
Electromagnetic Properties ◽  
Carbon Powder ◽  
Textile Materials ◽  
Properties And Characterization ◽  
Functional Textiles

Abstract The paper presents a synthesis of the research performed on the electromagnetic properties and characterization of textile and non-textile materials with applications in shielding and protection from the electromagnetic field. The composite structures of functional textiles intended for protective clothing or general applications for electromagnetic immunity are presented and characterized. There are analyzed composite textiles with amorphous, ferrous or non-ferromagnetic metallic threads manufactured by means of woven and knitting classical technologies as well as materials using non-metallic, electrically conductive powders. The properties of the plain jersey, rib jersey, full and half cardigan fabric, Milano rib, are presented, too. Besides textiles, there are also characterized some composite and non-composite structures using metallic yarns and carbon powder. Another direction of interest relates to the use of textile materials with amorphous metal structure with the scope of achieving a more efficient protection to the electromagnetic fields used in cellular systems and Wi-Fi networks. In addition, a comparative analysis of the methods of characterization of composite structures is made.

scholarly journals Compromising Radiated Emission from a Power Line Communication Cable

2011 ◽  
Vol 7 (1) ◽  
pp. 16 ◽  
Author(s):  
Virginie Degardin ◽  
Pierre Laly ◽  
Martine Lienard ◽  
Pierre Degauque
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Compatibility ◽  
Preliminary Investigation ◽  
Software Tool ◽  
Field Measurements ◽  
Power Line ◽  
Statistical Characteristics ◽  
Power Line Communication ◽  
Laboratory Environment ◽  
Radiated Emissions

This contribution presents a preliminary investigation on the possibility of eavesdropping, i.e., of extracting information by exploiting the electromagnetic field radiated in the vicinity of a power line communication (PLC) network. This kind of problem is usually known in the electromagnetic compatibility area under the codename TEMPEST. Electromagnetic field measurements were carried out in a laboratory environment, both inside and outside a building, and the main statistical characteristics of the compromising channel are presented. A software tool simulating a PLC communication has been developed and used to draw apreliminary conclusion on whether the radiated emissions can be exploited or not.

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