GATE EE 2023 Set 1 — Question 58
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Power Electronics → AC-DC Converters → Semi & Full Converters (1φ)
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Question
The single phase rectifier consisting of three thyristors , , and a diode feed power to a 10 A constant current load. and are fired at and is fired at . The reference for is the positive zero crossing of . The average voltage across the load in volts is _______ (Round off to 2 decimal places).
Correct answer
39 to 40.5
Solution
From the figure V, so V, and the load is a constant 10 A current.In this bridge (top left) and (bottom right) form one conducting pair, (top right) and (bottom left) form the other, while with (or with ) provide a zero-voltage freewheeling path for the constant load current.Conduction sequence over one cycle (angles in ):
1.: and , fired at , conduct and .
2.: as the supply reverses, becomes forward biased and takes the load current from ; and freewheel, so .
3.: is fired at , so and conduct and (positive in this interval).
4.: is not fired again until of the new cycle, so the constant current continues through and and , now negative.
Averaging over :Answer: VContinue learning with Success Tracker
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