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If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

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in Power Electronics by (27.1k points)
If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

(a) all the junctions are reversed biased

(b) all the junctions are forward biased

(c) only the middle junction is forward biased

(d) only the middle junction is reversed biased

I have been asked this question in examination.

My question is from Thyristors-1 topic in section Power Electronics Devices of Power Electronics

1 Answer

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by (45.1k points)
Right answer is (c) only the middle junction is forward biased

Easy explanation: The device is in the reverse blocking state (3rd quadrant) & only the middle junction is forward biased whereas other two are reversed biased.

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