The paper deals with the sizing of controlled converter applications, with
possibly, closed control loops, by combining several tools. The approach pr
oposes to use symbolic calculation to perform sizing times, but also numeri
cal calculation when symbolic expressions do not exist. The sizing model is
deduced from criteria on the components (control values, average values, l
osses, rms values, maximum values, durations, etc.). The approach is based
on two development environments: Gentiane for the modelling and simulation
and Eden for the optimisation.