First Power Cycling Results of Improved Packaging Technologies for Hybrid Electrical Vehicle Applications

Conference: CIPS 2010 - 6th International Conference on Integrated Power Electronics Systems
03/16/2010 - 03/18/2010 at Nuremberg, Germany

Proceedings: CIPS 2010

Pages: 5Language: englishTyp: PDF

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Hensler, Alexander; Lutz, Josef (University of Technology, Chemnitz, Germany)
Thoben, Markus; Guth, Karsten (Infineon Technologies, Warstein, Germany)

For cooling the power electronics in hybrid electrical vehicles nowadays a separate cooling loop is needed, which has lower temperature in comparison to cooling loop of combustion engine. For omission of second coolant loop power electronics with improved reliability is needed, especially power cycling capability must be higher. In this application with coolant temperature until 125deg C, power electronics with high power density is exposed up to 200deg C junction temperature. Weak points in power modules at high temperatures at power cycling load are wire bonds and joint between chip and substrate. These two interconnections were improved during ongoing research project EfA (=electronics for active gear). Power cycling tests were conducted with test power modules. The results show significant higher power cycling capability when as well bond wires as chip-substrate joints are improved.