Input frequency

50 Hz

Output frequency

25 Hz

50 Hz

100 Hz

Time interval

1

2

3

4

1

2

1

2

3

4

Switching mode

S_1a-S_4a

S_3b-S_2b

S_2a-S_3a

S_4b-S_1b

S_1a-S_4a

S_4b-S_1b

S_1a-S_4a

S_2a-S_3a

S_3b-S_2b

S_4b-S_1b