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What is the B phase voltage when only T1 and T2 are conducting from 60° to 120°. Consider star connected R load.

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in Power Electronics by (27.1k points)
What is the B phase voltage when only T1 and T2 are conducting from 60° to 120°. Consider star connected R load.

(a) Vs

(b) Vs/2

(c) –Vs/2

(d) 0

I have been asked this question in an interview.

This interesting question is from 3-Phase Bridge Inverters-3 topic in portion Inverters of Power Electronics

1 Answer

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by (45.1k points)
Right option is (c) –Vs/2

Easiest explanation: When T1 and T2 are conducting, R phase is connected to the positive bus through the T1 SCR and B phase is connected to the negative bus through the T2 SCR. Considering that the load is a balanced R load.

Devices

T1

T1

0

T4

T4

0

T1

T1

0

T6

0

T3

T3

0

T6

T6

0

T3

0

T2

T2

0

T5

T5

0

T2

T2

VRN = Vs/2

VBN = -Vs/2.

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