Determining the minimal decoupling capacitor in a high speed switching cell using optimization
Résumé
This paper aims determining the minimum
decoupling capacitor Cdec for a high speed switching cell. It is
determined when any increase of its value does not decrease the
overvoltage at turn off anymore. A simplified model is deduced
from a full understanding of the switching cell behavior,
including the effect of all stray inductances and all interactions
within the switching cell. This model is used in an optimization
process in order to obtain directly the minimal value of Cdec.
The methodology is validated in comparison with time
simulation, as well as using experimental results. It has be used
to analyze the impact of the switching cell parameters on the
minimum value of Cdec: switching speed, stray inductances and
additional resistance are considered