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Find VYB, when T6, T1 and T2 are conducting. Consider a star connected R load.

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Find VYB, when T6, T1 and T2 are conducting. Consider a star connected R load.

(a) Vs

(b) Vs/3

(c) 0

(d) 2Vs/3

This question was posed to me during an online exam.

Question is from 3-Phase Bridge Inverters-2 topic in portion Inverters of Power Electronics

1 Answer

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Correct answer is (c) 0

The explanation is: When 6, 1 and 2 are conducting and the others are off. They conducting SCRs can be represented as closed switches. The load terminals Y and B are connected to the negative bus but the terminal R is connected to the positive bus. Supply voltage is Vs.

VYN = VBN = -Vs/3.

VYB = VYN – VBN = (-Vs/3) – (-Vs/3) = -Vs/3 + Vs/3 = 0.

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