Turn-off behavior of 4.5 kV asymmetric IGCTs under zero voltage switching conditions

Abstract

This paper presents the experimental characterization of four different types of 4.5 kV, 91 mm asymmetric IGCTs under zero-voltage switching. On-state and turn-off tests at ratings up to 2.8 kV/3.3 kA with several resonant snubber capacitances and different junction temperatures have been performed to obtain experimental data. For converter loss modeling, e.g. dc-to-dc converters for offshore windfarms, the measured device losses have been used to derive a parameter-dependent fitting function.