Silicon controlled rectifier circuit with parallel transistor - has Zener diode between rectifier anode and gate terminal to protect against excess voltages

摘要

Circuit arrangement with SCR. (thyristors) switched on and off by a brief control or trigger pulse is described and comprises a parallel arrangement of thyristor and transistor in the power current path. More specif. the thyristor is fired by means of a control pulse and is switched off by means of rapid transfer of the current in the parallel connected transistor. A Zener diode is inserted across the power current path between the anode and gate connection of the thyristor, specif. in order to provide a protection facility against excess voltages.