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An Airborne High Temperature SiC Inverter for Medium Power Smart Electro Mechanical Actuators
Keywords: Normally-On JFET, Inverter, Airborne
Normally-On SiC JFETs are good candidates for power switches in high temperature applications, in Three Phase Voltage Fed Inverters used to drive Electro-Mechanical Actuators (EMA) for the more electrical aircraft where the ambient varies from -55 °C to 200 °C. The power of the EMA is in the 1 to 5 kW range, the DC bus voltage is 540 V. It is also necessary to implement passive subsystems such as Electro-Magnetic-Interference (EMI) filters, power inductors, transformers, packaging and interconnection solution that withstand the wide temperature profile. The gate driver for normally-On devices must include a safe solution against short-circuit in the event of a power supply failure. The final paper is based on a completed industrial project and laboratory work. The technical aspects of the prototype are presented and an integrated protection circuit for normally-On switches is described. A study on the safety operation area of the JFET, carried out in the laboratory, permits to validate the efficiency of the protection circuit. The experimental converter is built using engineering samples (SiCED JFETs, SOI drivers) and laboratory made components (inductive wire wound, nano-crystalline core components), assembled with an available high temperature package (Si3N4) and technology. References are made to work previously published at HiTEC and other well known conferences and journals. Illustrations include photographs of the prototype, bloc diagrams of the electronic circuits used in the gate driver and protection circuit, main parameters tables, and details of circuits and associated electrical measurements. The material for this paper is already collected and the final report of the industrial project has been delivered.
Dominique Bergogne,
Universite de Lyon, Laboratoire Ampere
Villeurbanne, Rhone-Alpes

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