The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, after explaining the reasons why some players asked to standardize also the 3–150 kHz EMC maximum acceptable range, we describe the type of disturbances depending on the frequency range and on the type of equipment that can generate such disturbances. Furthermore, we illustrate the different methods to reduce them. In particular, we explain a method to design a suitable passive filter...
This paper proposes simple simulation modeling method of Electromagnetic Interference (EMI) and predicting potential risk of EMI radiation by specific noise source focused on Printed Circuit Board (PCB). Electromagnetic Simulation (EM) is commonly used to accurately determine the root cause of EMI problems on a PCB. The drawback of EM simulation is that it sometimes requires prohibitively large computing...
In this paper, the design procedure of three-phase line impedance stabilization networks (LISN) for EMC pre-compliance testing laboratories is proposed. The three-phase LISN schematics and the detail of its components are provided. Finally, the experimental results demonstrating the performances of proposed three-phase LISN are given.
A new test method has been implemented for testing the EMC performance of small components like small connectors and IC's, mainly used in mobile applications. The test method is based on the EMC-stripline method. Both emission and immunity can be tested up to 6GHz, based on good RF matching conditions and with high field strengths.
A grid simulator is required to have control over the key grid characteristics that may expose system compatibility problems related to the integration of distributed generation (DG) to the ac grid. This paper presents the development of a grid simulator that provides controllability of the impedance, voltage, harmonics and frequency at the ac interconnection of several DG units. In the implementation...
In This paper three optimization methods of ground design are used to solve EMI problems on the PCB mixed with both analog and digital signals. A model was built to test the surface current, E field, H field and S-parameters of the circuit board to consider the effect of these methods of avoiding EMI and SI problems. Then simulation experiments on a real product are carried out to show the improved...
In this paper we have completed experimental studies about a measurement device of electromagnetic conducted noise emission generated by Power Electronics (converters). This equipment, manufactured in Electromagnetic Systems Laboratory (ESL) of EMP, is called a Line Impedance Stabilization Network (LISN). Firstly, a presentation of the two topologies: mono and double cells are highlighted. Afterwards,...
This paper examines the applications of statistical physics-stochastic processes, ergodic principles, the use of nonlinear dynamic state equations and chaos, and the Wiener-Khintchine theorem to better explain how Intentional ElectroMagnetic Interference (IEMI) disrupts the performance of feedback and hybrid electronic systems such as control systems, power electronics and SCADAs. The origin of spurious...
The compliance with standards calls for proper designed EMI filters. EMI typically comprises common mode (cm) and differential mode (dm) noise. A systematic optimization of EMI filters requires the knowledge of the contribution and distribution of these two noise sources. The paper discusses different methods that allow the independent measurement of cm and dm noise. One suitable method described...
High frequency (HF) models of electrical motors and converters are of basic importance for Electro Magnetic Compatibility (EMC) characterization of electrical drives and for EMI filters design. In this paper a method for characterizing and tuning HF models (150kHz - 30MHz) for induction motors has been proposed based on experimental measurements of the motor impedance. Impedance measurements have...
Two-current probes method and S-parameter method are studied comparatively for conductive EMI noise source modelling in this paper. Firstly, the basic theory of the two-current probes method and S-parameter method are introduced for noise source impedance extraction. Secondly, ZX and Zsetup are important intermediate results in the two methods, therefore their extractions are analyzed respectively...
The main source of Electromagnetic Interference (EMI) emissions in power converters used for Telecom application comes from the high switching frequency of DC voltages. Power converters are generally operating in a periodic steady state, interested converter waveforms are typically periodic functions of time. Indeed the EMI emissions are a critical factor, which, can harm the system and degrade the...
This paper describes a method to estimate of L-band interference levels coupled to coaxial cables immersed in an electromagnetic environment. To present the above mentioned method, the modeling strategy, briefly including the main theoretical aspects, the interpretation of the results and the use an electromagnetic simulation tool for this particular problem are specified in detail. The characterization...
Traditional materials for coils and common mode chokes are iron and ferrites. Iron has a high saturation level but low permeability, and ferrite has low saturation and high permeability. Nanocrystalline materials are a rather new material with a high saturation and a high permeability. The advantages of this material and applications in EMC will be described.
A high frequency (HF) modeling method of low-voltage DC motor impedance is proposed. The model suggested is dedicated to the estimation of conducted electromagnetic interferences (EMI) within the car body and combines the advantages of both an analytical and a behavioral approach. It can simulate the motorpsilas complex impedance from the continuous up to a frequency of approximately 1 GHz. Moreover,...
A collection of slides from the authorpsilas seminar presentation is given. P/GBN is one of the key issues for designing high-speed digital circuit with good signal integrity (SI) and EMC performance. Several approaches to eliminate the P/GBN on the power delivery systems are investigated by both numerical simulations and experimental measurement.
This paper is based on the background studies and experiences in identification and implementation of the fundamental design techniques for making a PCB layout that needs a high degree of compliance for EMI/EMC. It suggests the use of techniques for considering PCBs configuration, Interplane coupling, Grounding methods, use of Bypassing and Decoupling capacitor and many other techniques required for...
Electromagnetic compatibility (EMC) of aircraft is a process of proving the capability of aircraft to operate satisfactorily in Electro Magnetic Interference environment. It is an involved process wherein considerable efforts towards design and test are required at various hierarchical levels. Effective EMI control on aircraft is possible and can be realized only if EMC exists at firstly the individual...
Modeling the coupling path of conducted EMI in power electronic devices is helpful for designing and debugging of their EMC. To achieve more effective model of EMI coupling path, the coupling effects among passive components should be involved in the model. In this paper, three kinds of coupling effects between two passive components are studied in detail. Based on testing the relationship of each...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.