Common mode choke model

[Anthony C Smith]

does anyone have a common mode choke model for LTSpice/switchercad III?
I am new to this simulator and not sure how to enter new symbols!!
help would be appreciated.
Regards
Anthony

 

[Jeroen Belleman]

Anthony C Smith wrote:

does anyone have a common mode choke model for LTSpice/switchercad III?
I am new to this simulator and not sure how to enter new symbols!!
help would be appreciated.
Regards
Anthony

Just use two inductors and couple them using a K directive.

Save the following as a .asc file and open it with LTSpice
and you'll see:

Version 4
SHEET 1 880 680
WIRE -240 240 -240 208
WIRE -240 352 -240 320
WIRE -112 352 -112 320
WIRE -64 208 -240 208
WIRE -64 320 -112 320
WIRE 128 208 16 208
WIRE 128 320 16 320
WIRE 224 208 128 208
WIRE 224 320 128 320
WIRE 352 208 304 208
WIRE 352 320 304 320
FLAG -240 352 0
FLAG -112 352 0
FLAG 128 208 out1
FLAG 128 320 out2
FLAG 352 320 0
FLAG 352 208 0
SYMBOL ind2 -80 224 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L1
SYMATTR Value 100ľ
SYMATTR Type ind
SYMBOL ind2 -80 336 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L2
SYMATTR Value 100ľ
SYMATTR Type ind
SYMBOL voltage -240 224 R0
SYMATTR InstName V1
SYMATTR Value ac 1
SYMBOL res 320 192 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 50
SYMBOL res 320 304 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 50
TEXT -88 264 Left 0 !K1 L1 L2 0.9999
TEXT -160 48 Left 0 !.ac dec 100 100k 100meg

Cheers,
Jeroen Belleman

 

[Anthony C Smith]

"Jeroen Belleman" <jeroen@nospam.please> wrote in message
news:de1jth$56k$1@sunnews.cern.ch...

Anthony C Smith wrote:
does anyone have a common mode choke model for LTSpice/switchercad III?
I am new to this simulator and not sure how to enter new symbols!!
help would be appreciated.
Regards
Anthony




Just use two inductors and couple them using a K directive.

Save the following as a .asc file and open it with LTSpice
and you'll see:
XXsnip
Cheers,
Jeroen Belleman

Thanks for that - much appreciated.
Regards
Anthony