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Thyristor simulation with Proteus

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Hello! I need some help with Proteus for a school project. The task is to make a single phase inverter with a center tapped transformer. I've done all the calculations and the only thing left is to simulate the circuit. The problem is that I don't know how to make the firing signals for the thyristors. The schematic is attached to the post. Any help will be appreciated.
Thanks in advance :)
 

from generator mode, just choose clok,,,, and connect it to the gate of the thyristor ,,,,and just choose the frequency you want,,,,,
 

I've done that but now I'm getting some errors:
Code: 
[SPICE] Transient GMIN stepping at time=2.50021e-006
[SPICE] TRAN: Timestep too small; timestep = 1.25e-019: trouble with instance d:t1:f
Any idea?
 
Time step to small, in some circuits designed in Proteus is attributed to not having a ground connection. Another common error is CPU overload.
 
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