Correct option is A
A thyristor is a type of semiconductor device used to control and switch high power. It is a four-layered, three-junction device that operates as a bistable switch, conducting when its gate receives a current trigger, and continuing to conduct while the voltage across the device is forward biased, provided the current remains above a certain threshold.
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Holding Current:
· The holding current is the minimum current that must flow through the thyristor to keep it in the 'on' state (conducting state).
· If the anode current falls below this level, the thyristor will turn off (i.e., it will revert to its non-conducting state).
· The thyristor remains in the conducting state as long as the current through it is above this holding current threshold.
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Latching Current:
· This is the minimum current required to turn on the thyristor after the gate pulse is removed.
· Once the thyristor is turned on, the current must remain above the latching current for the device to stay on. However, turning off the thyristor is related to the holding current, not the latching current.
