What are Thyristors?
Thyristors are switching devices that don t require any control current once they are turned on. A small control pulse of current is all that is required to turn them on and when that pulse is removed the thyristor continues to conduct ,assuming a minimum holding current is maintained e.g. SCRs, Triacs. Then there are pulse generating thyristors in which a holding current is meaningless e.g. unijunction transistors, shockley diodes.
