| Abstract |
STMicroelectronics has been developing ASD™ products that are well suited for mains
network switching (50Hz). These direct commutations, achieved by a GTO structure, generate a lot of
conducted electromagnetic perturbations, which are much higher than standard templates. Two
solutions are proposed to reduce these perturbations. The first one consists in acting directly on the
gate of the GTO. The second solution consists in controlling the turn off GTO current, by an external
circuit. In this case, the GTO is used in a linear mode during the commutation. In spite of an increase
of commutation losses, this system operates correctly, and offers interesting prospects for ASD™
applications, regarding the EMC aspect. |
