Fast Thyristor

The tiristor is a semiconductor functionally different from diode, because even when the device is directly polarized it will not drive until happens the pulse.

Instead of continually need something on the door (as in TBJs and MOSFETs), the tiristores are linked by a pulsed signal.

For SCRs, the control signal is a pulse of current. It is capable of driving the need current and voltage applied on it, varying by Tq (speed in the tiristor ns).