Fabrice Duval

Coupling interface circuit design for experimental characterization of the narrowband power line communication channel

This paper presents the design of an appropriate coupling interface circuit for measuring indoor power line transmission channel characteristics in CENELEC/FCC/ARIB low-frequency bands. This coupling circuit prevents the powerful and damaging 50 Hz/220 V current from entering sensitive measurement equipments while allowing narrowband PLC signals reception. It also guarantees impedance matching and instruments protection from very large voltage spikes and fast transients. Tests following EN 50065-2-3 standard [1] are done to verify that the proposed coupling interface provides a high safety level and is in compliance with immunity requirements.

MODEL ORDER REDUCTION FOR PEEC MODELING BASED ON MOMENT MATCHING

Accurate and efiective system-level modeling has become necessary to address electromagnetic compatibility (EMC) issues in modern circuit and system design. Model order reduction (MOR) techniques provide a feasibility to approximate complex circuit models with compact reduced-order models. In this paper, an efiective MOR technique entitled multi-point moment matching (MMM) is implemented for the partial element equivalent circuit (PEEC) modeling. Moment information at multiple frequency points is used in this method in order to accurately estimate a given system over an entire frequency range of interest, and for each frequency an enhanced asymptotic waveform evaluation (AWE) is applied to obtain a reduced-order model by constructing a pole-residue representation of the original transfer function. The improvements of conventional AWE in aspects of both moment computation and moment matching can avoid ill-conditioned moment matrices and unstable dominant poles. The complex frequency hopping (CFH) technique is employed to select the multiple expansion points by using a newly developed upward- search algorithm. Numerical simulations of coupled microstrip lines in both frequency and time domain indicate the efiectiveness of the proposed method.

A novel electromagnetic radiated emission source identification methodology

The proposed novel electromagnetic radiated emission source identification method is based on Independent Component Analysis (ICA). The identification is conducted by processing a suitable number of radiated spectrum data which is obtained by measurements at different points around equipment under test (EUT). Using specific kurtosis-based ICA algorithm, we can not only distinguish EUTs radiated emission from ambient electromagnetic noise, but also can extract emission feature of different radiation sources. Using correlated coefficient of extracted signal and original signal to investigate the accuracy of proposed method, the value can at least reach 0.98 and 0.72 for simulation and measurement data analysis respectively; feasibility and effectiveness of proposed method were verified by such good results.

A 3D PEEC Method for the Prediction of Radiated Fields From Automotive Cables

The partial element equivalent circuit method (PEEC) is well suited to extract the conducted electromagnetic disturbances parameters from wiring systems. It provides an efficient tool for the EMC study relevant to automotive cables. However the complete EMC analysis of embedded systems requires also reliable models for the radiated emissions especially at high frequencies. In this paper a new approach based on the PEEC method and involving 3D field calculation is developed to evaluate emissions from radiating cables.

A New Methodology to Predict the Magnetic Shielding Effectiveness of Enclosures at Low Frequency in the Near Field

In this paper, a methodology to calculate the shielding effectiveness of enclosures with slots at low frequency in the near magnetic field is presented. This modeling technique is based on the magnetic moments and the transmission line approach and makes specific assumptions. It is applied to a slot of small size relative to the dimensions of the enclosure. The slot is electrically short. This technique is validated in the case of a real enclosure with numerical simulations and experimental data. This method is dedicated to the case of mechatronics boxes using in electric and hybrid vehicles, it allows obtaining the results with sufficient accuracy precision for dimensioning a magnetic shielding in a short time.

Magnetic Shielding Effectiveness of Enclosures in Near Field at Low Frequency for Automotive Applications

In this paper, a modeling methodology is presented in order to calculate the magnetic shielding effectiveness at low frequency in the near field of enclosures with a slot. The so-called hybrid approach combining analytical and numerical methods is developed and validated experimentally. The application concerns an enclosure with a slot for electric and hybrid vehicles. The developed technique allows finding the order of magnitude of radiated fields for electromagnetic compatibility design in a very short time.

Study of susceptibility of an MCU control system in the automotive field

This paper introduces a technique to detect the EMI environment of MCU relying on itself. The measurement setup is explained in detail. Furthermore, based on measurement, an output signal data library and susceptibility results are achieved. Finally, we present a technique which can detect disturbance and PMS (program multi-switching) system which can increase the reliability of MCU control DC Motor system and guarantee system speed. The final objective of the work is to develop software technique to increase the reliability of MCU system in the automotive field.

Conducted immunity requirements tests for power line communication coupling interface circuit

This paper presents the specifications and the measurement results of conducted immunity requirements tests applied to coupling circuits designed, by authors, for the narrowband Power Line Communication channel measurement. Obtained results showed that the proposed design provides a high safety level to users and measurement devices, and is in compliance with CENELEC immunity requirements in terms of surge tests in both common and differential modes and fast transients tests specifications.

REDUCED PEEC MODELING OF WIRE-GROUND STRUCTURES USING A SELECTIVE MESH APPROACH

The wire-ground electromagnetic coupling structures are quite common in avionics system electromagnetic compatibility (EMC) analysis. The increasing complexities of physical structures make electromagnetic modeling an increasingly tough task, and computational e-ciency is desirable. In this paper, a novel selective mesh approach is presented for partial element equivalent circuit (PEEC) modeling where intense coupling parts are meshed while the remaining parts are eliminated. With the proposed approach, the meshed ground plane is dependent on the length and height of the above wires. Relevant compact formulae for determining mesh boundaries are deduced, and a procedure of general mesh generation is also given. A numerical example is presented, and a validation check is accomplished, showing that the approach leads to a signiflcant reduction in unknowns and thus computation time and consumed memories, while preserving the su-cient precision. This approach is especially useful for modeling the electromagnetic coupling of wires and reference ground, and it may also be beneflcial for other equivalent circuit modeling techniques.

Thermal Effect Modeling on Passive Circuits with Mlp Neural Network for EMC Application

During the last two decades, several simulation tools have been proposed for the modeling of electronic equipments in function of the physical environmental changes. It was stated that numerous electronic components such as semiconductor devices can be afiected by the mechanistic efiects, humidity or simply the temperature variations. To study the last efiect, based on the multilayer perceptron neural network (MLPNN), a characterization method of the passive electronic device thermal efiects is introduced in this paper. The method proposed was realized toward the equivalent circuit identiflcation of the under test device (R, L, C components) measured input impedances. To demonstrate the relevance of the method, numerical computations with MLPNN algorithms implemented into Matlab were performed. First, a capacitor modeling from 30kHz to 1GHz for the temperature variation from 25 - C to 130 - C is presented. It was found that a good agreement between the proposed model and the measurement is observed. Then, a commercial EMI low-pass fllter was also characterized in RF frequencies through the S-parameter identiflcation. Finally, further discussion on the potential applications of this work, in particular, in the electromagnetic compatibility (EMC) fleld is ofiered in the last part of this paper.