This research is in a context of massive introduction of electrical systems in transport. Most of the studies concern the reliability of power electronics components and systems and the development of converter architectures.

 

At the centre of these devices are the main players, power semiconductor components, whose reliability is crucial, particularly in sensitive contexts (passenger transport, critical infrastructure). These components are subject to different systematic constraints in applications and the GEM studies the impact of these constraints on their aging. For this, the team develops and exploits original test benches that recreate the service conditions. The results obtained are used to feed databases and provide empirical life models. In addition, the team is interested in the mainly thermo mechanical causes of the observed deteriorations and failures, in collaboration with thermo-mechanics.

 

In the frame of power integration, the GEM is working on the synthesis of new power converter architectures, the intrinsic performance of which can be maximized by integrating these systems. They are based on the "parallel" association of a large number of identical cells, interconnected by an original magnetic coupling device associated with a particular control law (2 patents are derived from these techniques). While the application to integrated converters is a preferred way of exploiting these principles, many applications to more conventional technologies are also very promising. Recent work by the team has made it possible to produce demonstrators with performances well above the state of the art, and corresponding to specifications of on-board aeronautical networks or land vehicles:

  • Isolated converter 28V-600V-12kW using MOSFET SiC chips, with 8-phase architecture according to the CNRS-INPT-UM patent WO 2007/006902 A2 (2016, J. Brunello thesis)

  • Three non-isolated converters 28V-300V-10kW with 6-phase magnetic coupler according to the CNRS-INPT-UM Patent WO 2007/006902 A2 (2015, Liebherr Aerospace funding)

  • Electric vehicle induction charging system 22kW (2017, A. Hammoud thesis - IES Synergie funding)

In the context of the global project "more electric aircraft", aiming to replace a maximum of fluid pressure devices with electrical devices, the team has also developed a strong partnership with the SAFRAN group on the design of innovative actuators and generators, reliable and with high specific performances. The work currently focuses on the characterization of very high frequency machines (up to 2 kHz) in order to reach mass powers of the order of 10 kW/kg.

 

PARTNERS : The studies carried out by P. Enrici, F. Forest, J-J. Huselstein, T. Martiré and D. Matt are networked (ANR FIDEA and ETHAER, supported by the team) with the main national actors of the topics that are the laboratories of the GDR SEEDS community (SATIE, Ampère, LAPLACE, GeePs, PROMES), as well as public and industrial players such as IFFSTAR, Airbus, Liebherr Aerospace, IES Synergy, SuperGrid Institute, ECA Robotics or the SAFRAN group.

Aging bench of IGBT power components

Non-isolated converter 28V-300V-10kW for aeronautics

 

Isolated converter 28V-600V-12kW using SiC MOSFET chips, with 8-phase architecture

High Frequency Synchronous Magnet Motor (1500 Hz to 4500 rpm), 25 kW, 5 kg (Pm = 5 kW / kg)