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For the circuit shown below, T1 and T2 (from top T1 and T2) are both fired at an angle α. Then from ωt = π to ωt = π+α

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in Power Electronics by (27.1k points)
For the circuit shown below, T1 and T2 (from top T1 and T2) are both fired at an angle α. Then from ωt = π to ωt = π+α

(a) None of the devices conduct

(b) T1 and one diode will conduct

(c) T2 and one diode will conduct

(d) Both the diodes will conduct

The question was asked during an interview.

My enquiry is from Single Phase Semi-Converters-2 in chapter Converters of Power Electronics

1 Answer

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by (45.1k points)
Right choice is (d) Both the diodes will conduct

Best explanation: From ωt = π to ωt = π+α, None of the SCRs are fired and both the diodes are forward biased due to the nature of the load. As such, they start to conduct and freewheel all the inductor energy.

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