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For the rectifier circuit shown in the figure, the expression for the average value of output voltage = __________, provided 'α' is the firing angle.

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Single phase full wave rectifier

Case 1: From α < ωt < π + α

T1 and T2 conduct. 

So, Vo = Vs

Case 2: From π + α < ωt < 2π + α 

T3 and T4 conduct.

So, Vo = -Vs

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