GATE EE 2017 Set 2 — Question 12
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Power Electronics → AC-DC Converters → Uncontrolled Rectifiers (1φ, 3φ)
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Question
In the circuit shown, the diodes are ideal, the inductance is small, and . Which one of the following statements is true?
Correct answer
(A) D₁ conducts for greater than 180^ and D₂ conducts for greater than 180^.
Solution
Due to the presence of the source inductance , the current cannot be transferred instantaneously from one diode to another during commutation.
1.During the positive half-cycle, conducts the load current .
2.When the source voltage reverses at , becomes forward-biased and starts to conduct.
3.However, continues to conduct until the current through the inductor is fully commutated to the path. This period is known as the overlap angle .
4.Consequently, conducts from to , and conducts from to .
Since , both diodes conduct for an angle greater than .Continue learning with Success Tracker
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