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in Electronics by (52.3k points)

Explain the working of single phase full wave AC voltage controller with resistive load.

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TRIAC is a bi-directional solid state device and conducts in both halves of ac supply. During positive half cycle MT2 becomes positive w.r.t MT, and gate becomes positive w.r.t MTTRIAC conducts when gate pulse is injected at a firing angle a. The current follows TRIAC in the voltage wave shape from angle α to π. At π, the zero crossing of the supply voltage, the TRIAC is switched OFF due to line commutation.

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