Turning on a Thyristor

Discussion in 'General Electronics Chat' started by ActivePower, May 28, 2012.

  1. ActivePower

    Thread Starter Member

    Mar 15, 2012
    Well, I've recently started reading about thyristors and I have been stuck by something my instructor said about the turn-on process.

    During the forward-biased state of the thyristor the junctions J2 is reverse-biased, which is essentially responsible for the forward "blocking" mode. However, after the break-over voltage, J2 starts conducting magically.

    How does this change come about? Is this due to the breakdown or avalanche process?
    If so, how can a device recover from it and turn-off?
    I mean, we say diodes are destroyed if the reverse voltage exceeds the breakdown voltage but how come the same process not destroy the thyristor junction?