Analytical Models Synthesis of Power Electronic Converters

In this paper we proposes a synthesis of different mathematical models of power electronic converters based on Thevenin/Norton equivalent circuits. Those models, composed by impedances and harmonic noise sources, are helpful to predict the conducted ElectroMagnetic Interferences (EMI) generated by converters connected to the electrical network. Moreover, the extracted impedances are determining for sizing EMC filters. The proposed analytical model is tested with PSpice simulations and validated by experimental measurements, from DC frequency until 30MHz

PROPRIETÉS BIDIMENSIONNELLES STATIQUES ET DYNAMIQUES DES TÔLES MAGNÉTIQUES

The aim of our study is to analyse and understand the static and dynamic behavior of magnetic sheets, used in electrical engineering, when they are submined to a rotational magnetic field. Comparative study is done at first between two devices of Rotational Single Sheet Tester existing in laboratory. The magnetic characteristics are well measured by RSST 300. The deference's observed on the losses can be considered satisfying. However H measurement discrepancies can be higher than losses. After we propose a method for obtaining the reversible BOO law from dynamic tests. The method is investigated for GO FeSi and in frequency range between 10 to 400Hz, under constant circular induction. AIl the réversible characteristics are identical from lOto 200Hz. This confirms the validity of the approach. The obtained BOO characteristic is taken into account by a model based on total energy evaluation. An experimental checking of the model has been done. It permits to evaluate performers of the model and interpret the observing phenomena in order to take them into account.Le but de notre étude et d'analyser et de comprendre les propriétés dynamiques et statiques des tôles utilisées en Génie Electrique, quand elles sont soumises à un champ tournant. Nous avons réalisé au début une étude comparative des deux dispositifs de mesure en champ tournant existants au laboratoire. Le RSST 300 donne de meilleurs résultats. si le RSST 80 donne des mesures correctes pour les pertes. On observe des écans qui peuvent ëtre importants pour les champs .Ensuite nous avons proposé une méthode pour d'obtenir un comportement rêversible d'une tôle FeSi GO à partir des mesures dynamiques. La méthode est testée pour une fréquence allant de 10 à 400Hz Toutes les caractéristiques obtenues entre 10 et 200Hz sont identiques cela confirme la validité de notre approche. La caractéristique B(H) obtenue est pris en compte par un modèle basé sur le calcul de l'énergie totale. Une vérification du modèle a été effectuée. Elle aboutit à une critique et une interprétation pour mieux tenir compte des phénomènes observés

Analysis of Shielding Effectiveness of a Rectangular Enclosure with Aperture Irradiated by Plane Wave Using the Intermediate Circuit Model

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A New Analytical EMC Model of Power Electronics Converters based on Quadripole System: Application to Demonstrate the Mode Decoupling Condition

International audienceThis paper proposes a new general method tomodel converters by a four-terminal circuit which consists in a π-quadripole network containing three impedances between eachpair of electrical access, L to N, L to G and N to G. Theimpedances analytical expressions have been established usingquadripole theory, and depend both on the converter switchingfunction and impedances. The analytical method developed isapplied on a DC-DC converter and validated with PSpicesimulations and an experimental measurement. This approach isapplied to highlight the condition of the common mode anddifferential mode decoupling

Numerical study for the shielding effectiveness of a rectangular enclosure with apertures

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Numerical Study for the Shielding Effectiveness of a Rectangular Enclosure with Apertures

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Analytical Model of DC-DC Converters Based onSwitching Impedances and EMI Sources

International audienceSince studies are intended to be used to predictthe compliance with Electromagnetic standards, an accuratecomputing of a common and differential mode conducted noise isnecessary. Nowadays, the modern networks -as the car’s networksupplying many electrical actuators- include many powerconverters to manage efficiently the power transfer, but also along cable (conductors), which creates new issues (interactionbetween cable and converter’s noise sources), and therefore theEMC study becomes more complex. For this reason, in this paperwe propose an analytical model to compute a common modeequivalent conducted noise sources, inside the network, at anysite of the DC-network (all along the cable). Firstly, noise sourcesmodelling the EMC behaviour of converters connected to theDC-network, are extracted and identified in both frequency andtime domains. Therefore, converter’s electric equationsmodelling its behaviour are performed by defining amathematical switching function. The model is tested with timedomain simulations and validated by experimentalmeasurements. Secondly, the extracted converter’s model, basedon equivalent noise sources, is used to predict the conducted noiseinside a defined network, at any location of the cable (network).The process of the network’s modelling is built by using theTransmission Line theory (TL) of lossless bifilar lines. Thisnetwork’s model is crucial for EMC analysis, to evaluate theinteraction degree between the noise sources and cableparameters. Finally, the network’s model is tested by a timedomain simulation (LTSpice), and validated by an experimentalsetup

Étude des perturbations rayonnées dans un circuit électronique

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