During the first 120 degree, T1 conducts with T6 for 60 degree, and
then conducts with T2 for another 60 degree. The T3 will conduct for
120 degree (from 120 to 240 ) for 60 (from 120 to 180 ) with T2 and then
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conduct another 60 (from 180 to 240 ) with T4. The T5 will conducts 120
(from 240 to 360 ) with T4 for 60 (from 240 to 300 ) and then conducts for
another 60 (from 300 to 360 ) with T6.