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19 results on '"Blaquiere, Jean-Marc"'

5. Quasi-Flying Gate Concept Used for Short-Circuit Detection on SiC Power MOSFETs Based on a Dual-Port Gate Driver

Author

Picot-Digoix, Mathis, Richardeau, Frederic, Blaquiere, Jean-Marc, Vinnac, Sebastien, Azzopardi, Stephane, and Le, Thanh-Long

Abstract

The proposed dual-port gate driver architecture relies on a quasi-flying gate concept to protect SiC power mosfets against short-circuit events. Hard switching faults (HSFs) extract charges from the gate by causing a leakage current toward the source, while faults under load (FUL) lead to charge injection into the gate through the reverse transfer capacitance (CGD). Such phenomena lead to perturbations of the gate–source voltage (VGS), which are amplified by the gate resistor, acting as an enhancer of short-circuit signatures. Thus, a small gate resistance is used to ensure high switching dynamics, while a larger one is switched on during pulsewidth modulation on-state operation to identify possible faults. A dual-port gate driver is then proposed to ensure fast switching with HSF and FUL monitoring. The fault detection scheme relies on comparing two thresholds to VGS relative changes to the nominal gate voltage. Experimental results using TO-247 package 1.2-kV/36-A SiC mosfets exhibit promising inverter leg short-circuit detection and protection against faults in less than 300 ns.

Published
2023
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19. New three-wire supply systems for DC electric railways

Author

Jean Marc Blaquiere, Herve Caron, Diego Iannuzzi, Philippe Ladoux, Marino Coppola, Ladoux, Philippe, Coppola, Marino, Iannuzzi, Diego, Blaquiere, Jean Marc, Caron, Herve, Convertisseurs Statiques (LAPLACE-CS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Direction de l’Ingénierie, Société Nationale des Chemins de Fer Français (SNCF), and Electrical Engineering Department, University Federico II of Naples

Subjects
Engineering, business.industry, 020209 energy, [SPI.NRJ]Engineering Sciences [physics]/Electric power, 020208 electrical & electronic engineering, Polarity symbols, Electrical engineering, 02 engineering and technology, 7. Clean energy, Test platform, 0202 electrical engineering, electronic engineering, information engineering, Rail traffic, Electrical and Electronic Engineering, business, ComputingMilieux_MISCELLANEOUS, Overhead line, Voltage, Electronic circuit
Abstract

Nowadays, in several European Railway networks, the old DC supply systems are severely limited by line-voltage drops. In some sectors, it is not possible to increase traffic or to operate locomotives at their nominal ratings. To increase the capacity of a DC supply system, without additional substations, the authors propose a new three-wire supply system which restores the overhead line voltage with multilevel DC choppers operating as voltage boosters. Circuits using a third wire with a negative or a positive polarity are considered and compared. Case studies are presented for the French and Italian rail networks. Finally, experimental results performed on a test platform of the French railways, are presented in the case of a double 1.5 kV supply system.

Published
2015

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