Electronics Forum / CAD / August 2008

I draw a transformer simultion with spice. when I chang ratio

from 10:1 to 1:1. I get the model as follow.

.SUBCKT 1TO1  1 2 3 4
VISRC 9 4 DC 0V
FCTRL 6 2 VISRC 1E+0
EVCVS 8 9 5 2 1E+0
RPRI  1 7 1E-1
RSEC  8 3 1E-1
LLEAK 7 5 1E-6
LMAGNET 6 5 1E-6
.ENDS 1TO1

when simulation is impletement, the information I got is
doAnalyses: Timestep too small
run simulation(s) aborted

But when I recover to 10:1, the simulation is runing.
.SUBCKT 10TO1 1 2 3 4
VISRC 9 4 DC 0V
FCTRL 6 2 VISRC 1E-1
EVCVS 8 9 5 2 1E-1
RPRI  1 7 1E-1
RSEC  8 3 1E-1
LLEAK 7 5 1E-6
LMAGNET 6 5 1E-6
.ENDS 10TO1

When I chnge above model
FCTRL 6 2 VISRC 1E+0
EVCVS 8 9 5 2 1E+0
to
FCTRL 6 2 VISRC 1E-1
EVCVS 8 9 5 2 1E-1
I got:
Warning: premature EOF
now, How shall I set up a 1:1 model?