Switching characteristic of silicon power-controlled rectifiers: II — Turn-off action and dv/dt self-switching

THE TURN-OFF process is the regaining of forward blocking ability-after termination of a forward current wave. By the turn-off process the silicon-controlled rectifier (SCR) is brought into the forward blocking condition where turn-on will not occur because of the unavoidable dv/dt slope of the reapplied forward voltage. The problem of the turn-off process is how to avoid unintentional turn-on. Thus, the study of the turn-off and turn-on processes cannot be separated.