I have made a 3 phase thyristor full bridge rectifier. But at the moment it is

I have made a 3 phase thyristor full bridge rectifier. But
at the moment it is working only for the half bridge
operation. Both the half bridges are on operation separately
but when i put it into full bridge operation the
oscilloscope output is zero. I rechecked that the pulses
are correct for each thyristor. what could be the possible
reason for this?

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