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Guillaume LEFEVRE

RENNES

Electionseuropéennes 2024

RETROUVEZ GRATUITEMENTLe résultat des européennes à Rennes ainsi que le résultat des européennes en Ille-et-Vilaine.

En résumé

Mes compétences :
Topologies de conversion
Composants magnétiques
Electronique de puissance
Semiconducteurs
Simulations
Thermique

Entreprises

  • FraCa - Team Leader

    2014 - 2015 The Little Box Challenge consists of designing and building a kW-scale inverter with the highest power density (at least 50 Watts per cubic inch). Based on a 2kW inverter, the dedicated volume must be less than 40 cubic-inches or 655 cubic centimeters. For further information, see https://www.littleboxchallenge.com/

    From the early stage, I've been attracted and enthusiastic with regard to the set of specifications. Three engineers joined me to attempt this competition and the FRACA team was born. Our motivation is to demonstrate that the technical requirements can be met with market-available components and controlled costs. To reach the target :
    - Multilevel-Interleaved topologies were selected to alleviate filtering constraints, spread losses and avoid thermal hot-spots ;
    - The low cost, high performance potential of Silicon Superjunction devices were promoted in the place of wideband gap components (SiC or GaN) ;
    - In conjunction with the distributed losses, a novel approach to thermal management was constucted for the 3D prototype.

    This project was personnally funded. The technical report (incl. measurements, pictures, waveforms, etc) was sent to the jury on July the 22nd. Unfortunately we were not selected among the 18 finalists.

  • Mitsubishi Electric R&D Center Europe (MERCE) - Ingénieur R&D

    2011 - 2014 Research and development in the field of :

    // Power converters (DC/DC, DC/AC) from a few watts to several hundreds of kW //

    - Innovative topologies dedicated to photovoltaic (PV) applications. Development of methodological tools to optimize the performance/cost ratio of a domestic PV converter
    - Thermal management of converters : natural or forced convection, liquid cooled systems, integrated power boards using thermal vias or metallic inlays
    - Associated control (single or three-phase PLL, current/voltages loops, MPPT)
    - Hardware implementation and experimental validation on pre-industrial prototypes
    - Patents : EP2779397 A1, EP2782235 A1 and EP 2874303 A1

    // Power modules and Semiconductors (Si and Wide Band Gap switches) //

    - Survey of technological trends (packaging, integration techniques, semiconductors, cooling)
    - Activities about low parasitics packages (Planar structures for instance) to fully benefit from the latest generation of semiconductors (SiC and GaN)
    - Investigations on double side cooling / soldering techniques in modules
    - Design and implementation of a Double-Pulse Tester (DPT) to benchmark active components. Switching losses measurements of a switching cell including IGBT/ Superjunction MOSFET/ SiC diodes under hard and soft (ZCS/ZVS) switching conditions.
    - Patents, Application number EU141554550 (requests for publication)

  • CEFEM Technologies - Ingénieur R&D

    2007 - 2011 // Technical lead in the development of a 15kW solar inverter (http://cefem-solar.fr/onduleurs-triphases/) //

    - Selection of suitable topologies and devices meeting the requirements, design of the overall hardware part (semiconductors and associated driving units, passive components and cooling system)
    - Implementation of innovative control laws to optimise operations from mid. power to light loads
    - Design, optimization and inspection of the control loops
    - Efficiency improvement and validation of a fully operative prototype
    - Continuous monitoring of technologies and devices to further improve the converter's performance to cost ratio

    // Design and manufacturing of magnetic components (chokes and transformers)

    - Design and technical proposal from a customer's request sheet (cost, losses, etc)
    - Technical supervision of prototypes with the production manager
    - Benchmark and analysis of various magnetic materials
    - Research activities to further improve the losses calculation (AC high frequency copper and iron losses) as well as the leakage inductance.

  • MGE UPS Systems - Ingénieur R&D

    2006 - 2007 * Elaboration du projet préliminaire SolPV pour l'appel à projet du Fond de Compétitivité des Entreprises
    * Analyse des contraintes de raccordement d'onduleurs solaires au réseau domestique (Normes, MPPT,
    rendement européen...)

    * Veille technologique de solutions de stockage. Caractérisation de batterie ZEBRA sur onduleur 200kVA

  • Faiveley - Ingénieur R&D

    2005 - 2006 * Tests et validation d'alimentations à découpage de faible puissance (Flyback, Forward) ;
    * Caractérisation de composants IGBT 1200V/1700V en commutation dure et douce (ZVS/ZCS) pour
    topologie multicellulaire KATIUM

  • Air Liquide - PhD Student (CIFRE contract)

    Paris 2001 - 2004

Formations

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