H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/732 (2006.01) H03K 17/723 (2006.01) H03K 17/73 (2006.01)
Patent
CA 2243776
An apparatus for limiting the holding current of a GTO is specified. The apparatus is part of a drive circuit for turning the GTO on and off and is defined in that a transistor is connected into the current path between the turn-on circuit of the drive circuit and either the gate or the cathode of the gate turn-off thyristor, the control electrode of the transistor being connected to the cathode or to the gate of the gate turn-off thyristor. A pnp transistor is preferably involved in the first case and an npn transistor in the second case. (Figure 2)
L'invention est un dispositif servant à limiter le courant de maintien d'un thyristor commandé par la gâchette. Ce dispositif fait partie d'un circuit d'attaque servant à activer et à désactiver le thyristor; un transistor est placé sur le trajet du courant entre le circuit d'activation du circuit d'attaque et la gâchette ou la cathode du thyristor, l'électrode de commande de ce transistor étant connectée à la cathode ou à la gâchette du thyristor. Dans la concrétisation privilégiée de l'invention, on utilise un transistor pnp dans le premier cas et un transistor npn dans le second cas. (Figure 2)
Coenraads Ard
Gruning Horst
Asea Brown Boveri Ag
Swabey Ogilvy Renault
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