A Thyristor or SCR (silicon controlled rectifier) is bit like a transistor.
When a small current flows into the GATE,
this allows a larger current to flow from the ANODE
to the CATHODE.
Even when the current into the gate stops the thyristor continues to
 flow current from anode to cathode.
It needs only a small trigger to turn ON.
There are two methods to stops its conduction
1. diverge anode current to other circuit
2. apply negative voltage
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Monday 4 February 2013
What is Thyristor?
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