Bruno Lefebvre

Supergrid Institute

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Fabien Sixdenier

Laboratoire Ampère

Marie‐Ange Raulet

Laboratoire Ampère

Noël Burais

École Centrale de Lyon

Piotr Dworakowski

Supergrid Institute

Florent Morel

Supergrid Institute

Matthieu Poirot

Sanofi (France)

Cyril Buttay

Laboratoire Ampère

Hadiseh Geramirad

Supergrid Institute

Christian Vollaire

Laboratoire Ampère

Alexis Fouineau

Supergrid Institute

Cooperative Institutions

Supergrid Institute

Centre National de la Recherche Scientifique

Laboratoire Ampère

Université Claude Bernard Lyon 1

École Centrale de Lyon

Laboratoire de Génie Électrique de Grenoble

Institut National des Sciences Appliquées de Lyon

Alstom (France)

Université de Lille

Université Grenoble Alpes

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Determination of Mathematical Model Parameters of a Medium Frequency Transformer

Michał Michna Andrzej Wilk Piotr Dworakowski Bruno Lefebvre

The paper presents the results of experimental studies of the medium frequency transformer. The object of the research was a prototype of a single-phase transformer with a core made of ferrite I-core elements and windings made of Litz conductors. The research was carried out to determine the parameters of the transformer's mathematical model. The scope of the tests included determining the magnetic hysteresis loop and measuring the winding impedance. The magnetic hysteresis loop has been included in the transformer model using a static Preisach model with feedback. The simulation results were compared with the measurement results.

Delta-wye transformer

Energy efficient transformer

Ferrite core

Transformer effect

10.1109/isem.2018.8442840

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Experimental study of the self-disturbance phenomena in a half-bridge configuration of Si IGBT and SiC MOSFET switches

HAL (Le Centre pour la Communication Scientifique Directe) (2020)

Hadiseh Geramirad Florent Morel Bruno Lefebvre Christian Vollaire Arnaud Bréard

This paper investigates the gate-driver design challenges encountered due to the fast switching of wide band-gap semiconductors (here, SiC MOSFETs) in the half-bridge configuration. It discusses precisely the common-mode current generated by fast switching passing through gate-driver, which leads to driving-voltage perturbations and disturbs the correct triggering of switches. This phenomenon is described here as self-disturbance and the experimental study shows that it is exacerbated with SiC MOSFETs, when compared with Si IGBTs. The solution proposed in this article is to block the generated noise linked to self-disturbance phenomenon by placing a common-mode choke into the gate path. The proposed solution is compared with the classical active Miller-clamp protection solution. The experimental results from 1.7kV, 300A SiC MOSFET validate the solution. The solution proposed in this work allows to keep the MOSFET gate-voltage perturbation lower than the MOSFET threshold voltage while it does not increase the switching losses. Experimental results show that by implementing the proposed solution, it is possible to reduce the input common-mode current through the gate driver by up to 20%.

Insulated-gate bipolar transistor

Gate driver

Choke

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A Medium Frequency Transformer Design Tool with Methodologies Adapted to Various Structures

Alexis Fouineau Martin Guillet Bruno Lefebvre Marie‐Ange Raulet Fabien Sixdenier

A comprehensive and generic medium frequency transformer (MFT) design methodology is presented in this paper, which can be applied to many transformer structures. Models were found or developed to cover all the necessary calculation, with emphasis on the balance between computation time and accuracy, leading to a fast and efficient design tool. Numerous MFT designs are available at the end with the possibility to choose the best candidate. A multi-megawatt offshore windfarm converter application was chosen to show the optimization procedure of the MFT design inside such a converter. The best potential design was retained and validated by numerous finite element simulations. This procedure was repeated for various MFT structures in order to perform a quantitative comparison of many different combinations of technological choices. This study can give insights on the best technological choices to be used for MFTs, and also shows significant differences in performance between structures.

Design methods

Optimal design

10.1109/ever48776.2020.9243104

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Citations (7)

De la philosophie à l’action

Elsevier eBooks (2011)

Bruno Lefebvre Matthieu Poirot

10.1016/b978-2-294-71304-0.00011-5

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Hysteresis modelling of a medium frequency single-phase transformer

Piotr Dworakowski Andrzej Wilk Bruno Lefebvre

The article describes a feedback Preisach hysteresis model equivalent circuit implementation of a medium frequency single-phase transformer being a part of a high power and high efficiency DC-DC converter. The macroscopic models of magnetic hysteresis are introduced and the feedback Preisach model is selected for further analysis. The hysteresis model is developed for a prototype transformer and the hysteresis loops are compared against a measurement. The equivalent circuit implementation of the hysteresis model is proposed and analysed. The equivalent circuit model is validated in no load operation and compared with a measurement.

Hysteresis

Single phase

Three-phase

10.23919/epe17ecceeurope.2017.8098958

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Measuring small differential-mode voltages with high common-mode voltages and fast transients – Application to gate drivers for wide band-gap switches

2022 International Symposium on Electromagnetic Compatibility – EMC Europe (2020)

Hadiseh Geramirad Florent Morel Bruno Lefebvre Christian Vollaire Arnaud Bréard

In power electronics, gate-voltage measurement is used to optimize the design of the gate driver. Therefore a proper measurement technique is vital to ensure the proper operation of the electronic device. Measuring a small signal in a high switching voltage environment is a complicated task especially for high-side switches in a half-bridge configuration with fast semiconductor devices where voltage probes are subject to high common-mode voltages with fast transients. Hence, this article compares experimentally the conventional differential probes with optically isolated probes for measuring a small signal (26V) with a 1200V common-mode voltage and high switching rates created by SiC MOSFET (30kV/μs). The conventional differential probe shows differences of measured voltage amplitude up to 10V compared to optically isolated probe. The experimental results prove that parasitic elements of conventional differential probes change the gate-voltage shape and increase the common-mode current in the experimental set-up up to 6dB.

Common-mode signal

SIGNAL (programming language)

High Voltage

10.1109/emceurope48519.2020.9245720

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Modeling of a current sensor with a FE-tuned MEC: Parameters identification protocol

HAL (Le Centre pour la Communication Scientifique Directe) (2009)

Fabien Sixdenier Marie‐Ange Raulet Bruno Lefebvre

This paper presents a magnetic circuit modeling of closed loop Hall-effect current sensors based on a magnetic equivalent circuit which could be simulated with a circuit type simulator software (PSPICE model). First, the principle of measurement of the closed loop Hall-effect current sensors is presented, Then, the magnetic equivalent circuit (MEC) modeling justified by the engineers' model needs is elaborated. Finally the parameters identification protocol based on 3D Finite-Elements (FE) simulations and simplex optimization method is explained.

Electronic circuit simulation

Hall effect sensor

Current loop

Current sensor

Identification

Magnetic circuit

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Impact Of Some Manufacturing Processes On Magnetic Properties Of Nanocrystalline Cores : Core Shape, Ribbon Shearing And Ribbon Width

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Alexis Fouineau Fabien Sixdenier Bruno Lefebvre Marie‐Ange Raulet Noël Burais

Nowadays, nanocrystalline soft magnetics materials for high power applications receive more and more consideration. Nevertheless, some technological parameters can have an influence of potential significance on the performances (losses, permeability, frequency behavior…). One main drawback of the nanocrystalline materials is their brittleness. To prevent this effect in order to handle the Magnetic Circuit (MC), it is preferable to impregnate it with varnish. Moreover, thanks to the impregnation, the MC can be cut in order to insert the winding. In this paper, the influence of various technological manufacturing processes on the magnetic properties of nanocrystalline cores is studied. Firstly, nanocrystalline magnetic cores of the same size, without impregnation and with three different varnishes, are experimentally characterized with a hysteresigraph (from DC to 1 MHz). Secondly, the same MC were cut in and characterized again. This protocol gives information about the influence of the varnish employed and on the cut separately. The results also help the end-user to choose the best technological processes for its application (example: medium frequency transformer (MFT))

Nanocrystalline material

Ribbon

Shearing (physics)

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Status of Development of the VM12 Steel for Application at High Temperature in Advanced Power Plants

J. Gabrel W. Bendick Bruno Lefebvre B. Vandenberghe

Improvement of boiler efficiency is reached by increasing the pressure and temperature of newly designed boilers. Recently developed steel grades such as T/P91 and T/P92 are used in the advanced power plants thanks to their high creep rupture strength resistance which enables maintaining acceptable thickness of the tubes and pipes. Nevertheless their operating temperature range is limited by their oxidation behavior which is lower than classical 12%Cr steels or austenitic steels. For these reasons we have developed a new steel grade which combines good creep resistance and high steam-side oxidation behavior. This new steel, based on chromium content of 12% and with other elements such as cobalt, tungsten and boron, is named VM12. Manufacturing of this grade has been proved by production of several laboratory and industrial heats and rolling of tubes and pipes in several dimensions by different rolling processes. In addition to base metal property investigations — including creep tests and high temperature oxidation behavior — welding, cold bending and hot induction bending qualifications took place. This paper summarizes the results of the investigations and presents the first findings for processing.

Base metal

10.1115/creep2007-26566

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Citations (3)

Endettement des menages et financement du logement

Bruno Lefebvre

Depuis le debut des annees 1980, les comportements financiers des menages, en France, se sont profondement modifies et l'on assiste notamment a une forte progression de leur endettement. Les schemas retenus jusqu'a present par les economistes pour expliquer les comportements d'endettement des menages sont trop simplistes pour analyser les mutations auxquelles nous assistons. Aussi avons-nous cherche a construire un modele explicatif des comportements d'endettement des menages en ne nous interessant toutefois a celui-ci que dans le seul cadre de leurs operations d'accession a la propriete. L’analyse approfondie des caracteristiques des menages accedant et des caracteristiques de leurs operations au regard de la theorie du cycle de vie et de la theorie des filieres d'accession a la propriete resulte a titre principal du patrimoine humain des menages. Par ailleurs l'analyse du fonctionnement des marches des credits a l'habitat montre que la demande de credit des menages peut etre rationnee. Sur la base de ces conclusions, il est alors possible de degager un schema general du comportement d'endettement des menages, dans le cas de l'accession a la propriete, en retenant le sens de la causalite ou le montant de l'operation immobiliere realisee depend du volume de credit obtenu. Le recours a la theorie du consommateur de K. J. Lancaster permet de rendre compte du comportement des menages face a la diversite du bien logement.

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