State

No.

Switching States

Voltages

S1

S2

S3

S4

S5

S6

Vab

Vbc

Vca

1

ON

ON

OFF

OFF

OFF

ON

Vs

0

−Vs

2

ON

ON

ON

OFF

OFF

OFF

0

Vs

−Vs

3

OFF

ON

ON

ON

OFF

OFF

−Vs

Vs

0

4

OFF

OFF

ON

ON

ON

OFF

−Vs

0

Vs

5

OFF

OFF

OFF

ON

ON

ON

0

−Vs

Vs

6

ON

OFF

OFF

OFF

ON

ON

Vs

−Vs

0

7

ON

OFF

ON

OFF

ON

OFF

0

0

0