help me by showing the ppt regarding 120 degree conduction mode

3PHASE BRIDGE INVERTER 120 DEGREE MODE
1.)Each GTO conducts for 120 degree of a cycle.
2.)GTO1,GTO3,GTO5 conducts for 120 degree and no conduction takes place for next 60 degree.
3.)GTO4,GTO6,GTO2 conducts for an interval of next 120 degree after GTO1,GTO3,GTO5 respectively but with a gap of 60 degree.
4.)Firing pulses of GTO1,GTO4 are shown with max magnitude.
5.)Firing pulses of GTO3,GTO6 are shown with less magnitude.
6.)Firing pulses of GTO5,GTO2 are shown with least magnitude.
7.)Magnitude is varied so that pulses could be observed easily in Scope.
8.)Observe the Voltage at Scope 1 after 0.6 seconds because thats the total time required for all the pulses to trigger.
9.)Load is a star connected to 3 phase system.