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Proportional driver for SiC BJT's in electric vehicle inverter application

: Frankeser, S.; Hiller, S.; Lutz, J.; Domes, K.

MESAGO PCIM GmbH, Stuttgart:
PCIM Europe 2014. International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. Proceedings. CD-ROM : Nuremberg, 20 – 22 May 2014
Berlin: VDE-Verlag, 2014
ISBN: 978-3-8007-3603-4
PCIM Europe <2014, Nuremberg>
Fraunhofer IISB ()

This paper describes the energy saving potential of base drive units for high-power bipolar junction transistors (BJTs). BJTs are current-controlled devices which lead to high requirements on the base drive circuit: high turn-on current, an on-state-current which is around 3% of the collector current and protections against parasitic turn-on during turn-off. Safety features like desaturation protection, safe startup of the base driver (because of essential large bypass-capacitors) and adapted PWM control strategies have been investigated. Furthermore, application related considerations are made: Especially in inverters for electrical drives with user dependent drive profiles (e.g. for a motor of an electrical vehicle), power savings can be achieved by adjusted base drive circuits and control strategies.