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Common mode choke model

Discussion in 'Electronic Design' started by Anthony C Smith, Aug 18, 2005.

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  1. 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
     

  2. 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 100µ
    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 100µ
    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
     
  3. Thanks for that - much appreciated.
    Regards
    Anthony
     
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