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In a three-phase semi-converter, at a time one SCR and one diode conduct simultaneously. With SCR T1 conducting which diode(s) is most likely to conduct along with T1?

(a) D2 only

(b) D3 only

(c) D1 and D2

(d) D2 and D3

I have been asked this question in homework.

The query is from Three Phase Converters-3 topic in chapter Converters of Power Electronics

1 Answer

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by (45.1k points)
Right answer is (d) D2 and D3

The best I can explain: T1 and D1 together will cause a S.C. D2 or D3 any of these two can conduct along with T1 depending on which phase voltage is currently active RB or RY.

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