Junction temperature control for more reliable power electronics
G. Buticchi, M. Liserre, A. Marquez, J. I. LeonG. Buticchi, M. Liserre, A. Marquez, J. I. Leon
Power semiconductor modules are built of different layers of copper and substrate to ensure electrical insulation on one hand and a good thermal conductivity on the other hand . For the electric connection between chips and terminals, aluminum bond wires are typically used , although copper has been recently introduced.
Variations of the ambient temperature and power variations create cyclic heating and cooling processes, also called thermal cycles. The thermal cycle magnitude is the most critical parameter for the scale of the aging
Electrical machines – Analysis of synchronous machine using free software
Luigi Alberti, Omar Bottesi, Cristian Babetto
The design of competitive and efficient electrical machines remains to date a fascinating engineering
challenge. Electrical machines involve a variety of transversal aspects including multiple physical fields, cost
and availability of materials and ease of manufacturing. Design goals are also numerous: efficiency, cost,
minimum weight, safe operation at high temperature. The new possibilities offered by the rocketing growth
of computational power and the availability of CAD software of many kinds have revolutionized the field of
electrical machine design. This tutorial introduces to a set of open source tools for the analysis and design of
synchronous machine. Some practical example with the analysis of real applications will be shown during
the tutorial. Special emphasis is given to electromechanical design of synchronous machine.
Advanced Material and characterization techniques
The design of competitive and efficient power electronics in drives applications is an engineering challenge. Especially the choice of the right capacitor technology and layout for the DC-link is crucial.
Aluminium electrolytic capacitors are still state of the art technology in DC-link use. Design-in goals are: high ripple current load, low cost, minimum size and life time at high temperature. The first part of this tutorial introduces the audience to the fundamental physics, materials and processes of aluminium electrolytic capacitors. Some practical examples of the analysis of real applications will be shown during the tutorial. Special emphasis is given to the selection and lifetime assessment of aluminium electrolytic capacitors. The second part of the tutorial addresses advanced microscope-based characterization techniques suitable for the investigation of power electronic components, with special focus on failure analysis of electronic components with focused ion beams (FIB).