State

Output voltage ( V a b )

Direction of output current ( I o u t )

Switches in ON states

1)

3 V d c

Positive

S 3 , Q 1 , Q 2

2)

2 V d c

Positive

S 2 , Q 1 , Q 2

3)

V d c

Positive

D S 1 , Q 1 , Q 2

4)

V d c

Negative

S 1 , D Q 1 , D Q 2

5)

0

Positive

Q 1 , D Q 3 or Q 2 , D Q 4

6)

0

Negative

Q 3 , D Q 1 or Q 4 , D Q 2

7)

V d c

Positive

S 1 , D Q 3 , D Q 4

8)

V d c

Negative

D S 1 , Q 3 , Q 4

9)

2 V d c

Negative

S 2 , Q 3 , Q 4

10)

3 V d c

Negative

S 3 , Q 3 , Q 4