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|High temperature, Smart Power Module for aircraft actuators|
|Keywords: Power electronics, Integrated power module, Inverter|
|The aircraft are currently designed around a so-called “more electrical” architecture, in which most of the classical hydraulic and pneumatic actuators are replaced by electrical systems. This results in an increase in the total electrical power consumption (more than 1 MW for a Boeing 787). A new standard in power distribution, that increases the electrical network from 270 to 540 V has then been defined to transfer more power and to keep the weight of the wiring within acceptable limits. Power electronics converters are required to control the electrical actuators. It is desirable to place these converters as close as possible to the actuators they drive : this reduces electro-magnetic emissions (EMI), wiring, and mechanical complexity. A consequence is that the converters are exposed to the same environment as the actuators. In particular, for jet engine or brake applications, the power electronic systems must sustain ambient temperatures ranging from -55 to 200°C. In this paper, we present a “half bridge” power module designed to operate over this wide temperature range, on a 540 V DC bus. This power module non only includes power semiconductors (SiC JFETs), but also the associated driver circuits (custom-designed SOI ASICs) and their associated discrete components. The packaging techniques were chosen carefully to achieve high temperature capability (All components are attached to a ceramic substrate, by silver sintering, a hermetic package is used...). The final paper will describe the design of this module: electrical circuit, protection systems integrated in the driver, choice of power devices, of the packaging solutions. Electrical measurement (waveforms) will be given over the complete temperature range (from -55 to 200°C).|
|Cyril BUTTAY, Researcher
Laboratoire Ampere, INSA de Lyon CNRS UMR 5005