KINDLY GIVE SOLUTION FOR THIS PROTEUS PROBLEM

[momin12]

[SPICE] TRAN: Timestep too small; timestep = 3.61812e-019: trouble with node #v:q2:fi2#branch. @0.000002505s
THIS IS THE ERROR SHOWING ON SIMULATING. MAYBE SOME ISSUE WITH Q2 THAT IS IN LOWER HALF. Kindly give solution for it. Thanks

[RFDx]

Don't you think the bridge rectifier (D4/5/6/7) is in the wrong place and should rather be placed between TR1 and C4? Right now the AC voltage from the transformer is (almost) short circuited by C4 (220uF).

[momin12]

It was like that before but i changed the circuit because I wanted to add Sepic converter in AC source because of some fluctuations we have like it goes to 180V from 220V so to maintain i added converter and placed rectifier at the end . Can i place rectifier before sepic converter? any guidance pls

i have attached the pic how it was before

[RFDx]

Can i place rectifier before sepic converter?

You have to. The SEPI-Converter needs a DC voltage at the input port. The output of the converter already has a rectifier (D3), no need for another one.