how to design PWM + transformer bu hspice ??

[andy2000a]

I design a PWM system and use hspice (not pspice)
simulation tranformer ..

my system is boost and have 1 transformer + 1 inductor
and PWM chip will drive power MOS for transformer
and second side inductor will output DC12v

I use behavior model (like book ) but second side is not really have high volt ==> and how to really simulation transformer ??
and I find if I add "L" in system will have long time simulation
but behavior transformer don't need inductor ..

some Pspice book use L + KL and K =0.999 ..
and another problem is simulation have error on time_step too small ..
should I add some resistor in ideal inductor ??

 

[andy2000a]

my transformer like this

N1 N2 1st side
N3 N4 / N5 N6 second side
.subckt TX N1 N2 N3 N4 N5 N6
E1 N7 N4 N1 N2 RATIO1
E2 N8 N6 N3 N4 RATIO2
FG1 N1 N2 VM1 RATIO1
FG2 N1 N2 VM1 RATIO2
RP N2 N1 1MEG
RS1 N3 N9 1U
RS2 N5 N10 1U
VM1 N9 N7 DC 0
VM2 N10 N8 DC 0
.ends

ps. I remove input node N1 N2 inductor ...
and even I assign ration=40 , I can not find 2nd side N3~N6 have hi volt
why ??

 

[leo_o2]

L1 n1 n2 10nH
L2 n3 n4 100nH
K1 L1 L2 0.99