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Home > Thèses et HDR > Thèses en 2018

17/09/2018 - François TAVERNIER

by Laurent Krähenbühl - published on , updated on


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Mr François Tavernier defends his PhD : Monday Sept. 17, 2018, 01:00PM.
Lieu : Ecole Centrale de Lyon, bâtiment W1, amphi 203.

Title :
Développement multipolaire en harmoniques sphériques et sphéroïdales appliqué à la modélisation de sources de rayonnement en compatibilité électromagnétique

Jury :

  • Rapportrice : Mme Ruth V. Sabariego (Professeur, Leuven, Belgique)
  • Rapporteur : M. Yann le Bihan (Professeur, Geeps, Paris)
  • Examinateur : M. Carlos A. F. Sartori (Professeur, EP-USP, Brésil)
  • Examinateur M. Ronan Perrussel (CNRS, Laplace, Toulouse)
  • Invité : M. Damien Voyer (Maître de Conférences, EIGSI, La Rochelle)
  • Encadrant : M. Arnaud Bréard (Maître de Conférences, ECL, Lyon)
  • Directeur de thèse : M. Laurent Krähenbühl (CNRS, Ampère, Lyon)

Abstract :
In the field of electrical energy conversion, many innovations have led to increasing power densities and frequencies in embedded systems, leading to electromagnetic compatibility (EMC) problems.

The traditional solutions for modeling these parasitic couplings are limited. The designer is often obliged to take into account the EMC by modifying the prototype, which extends the prototyping period and consequently increases the costs of placing it on the market.

This work implements a method to estimate the inductive couplings between subsystems in the design phase of a new device. This is achieved by taking into account the magnetic characteristics and the respective position of each subsystem. To model this coupling, the magnetic field generated by each device is represented in the form of a harmonic expansion with known coefficients: the mutual inductance between each pair of devices can then be deduced as a function of their positions. Finally, introducing these values in an electronic circuit simulation software enables us to predict the intra-system and inter-system couplings.

To implement this method, an approach both theoretical and experimental was used. We present a methodology to obtain the harmonic coefficients of the field around a device using numerical simulations and measurements. To deal with the latter, a measurement bench, allowing automatic and reproducible measurement series, was designed at the Laboratoire Ampère. To make this bench fully operational, we studied the impact of sensor positions, radius and noises on the expansion obtained. We also proposed an energetic criterion to assess the optimal choice of expansion type (spherical or spheroidal) and harmonic expansion center. Finally, using a priori information enables us to find a suitable expansion degree which limits the number of measurements to the lowest; as a result, the identification time of the harmonic coefficients of the tested device is optimized.

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