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ltspice model for a kettle element !

Discussion in 'Electronic Basics' started by IanM, Jul 31, 2010.

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  1. IanM

    IanM Guest

    Anyone like to suggest some improvements to my simulation of a relay
    switching a kettle element?

    I guessed at all values - the inductor value , no clue what that would be
    anyway


    Version 4
    SHEET 1 880 680
    WIRE 320 -272 0 -272
    WIRE 320 -224 320 -272
    WIRE 0 -192 0 -272
    WIRE 0 0 0 -112
    WIRE 192 0 0 0
    WIRE 192 32 192 0
    WIRE 320 80 320 -144
    WIRE -64 96 -480 96
    WIRE 0 112 0 0
    WIRE -48 128 -128 128
    WIRE -480 160 -480 96
    WIRE 192 160 192 112
    WIRE -64 176 -64 96
    WIRE -48 176 -64 176
    WIRE -480 272 -480 240
    WIRE -128 272 -128 128
    WIRE -128 272 -480 272
    WIRE -96 272 -128 272
    WIRE 0 272 0 192
    WIRE 0 272 -16 272
    WIRE 192 272 192 224
    WIRE 192 272 0 272
    WIRE 320 272 320 160
    WIRE 320 272 192 272
    WIRE -128 304 -128 272
    FLAG -128 304 0
    SYMBOL sw 0 96 R0
    SYMATTR InstName S1
    SYMATTR Value RELAYSW
    SYMBOL voltage 0 -208 R0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V1
    SYMATTR Value SINE(0 240 50)
    SYMBOL res 304 64 R0
    SYMATTR InstName R1
    SYMATTR Value 20
    SYMATTR SpiceLine pwr=3K
    SYMBOL ind 304 -240 R0
    SYMATTR InstName L1
    SYMATTR Value 90µ
    SYMATTR SpiceLine Ipk=13 Rser=0.5
    SYMBOL voltage -480 144 R0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V2
    SYMATTR Value PULSE(0 12 1 1u 1u 1 2 5)
    SYMBOL res 0 256 R90
    WINDOW 0 0 56 VBottom 0
    WINDOW 3 32 56 VTop 0
    SYMATTR InstName R2
    SYMATTR Value 1000K
    SYMBOL res 176 16 R0
    SYMATTR InstName R3
    SYMATTR Value 1000K
    SYMBOL cap 176 160 R0
    SYMATTR InstName C1
    SYMATTR Value 0.1µ
    TEXT -330 -56 Left 0 !.tran 0 2.1 1.9 0.01
    TEXT -232 392 Left 0 !.model RELAYSW SW[Ron=0.1 Roff=1G Vt=9 Vh=.4]
     
  2. IanM

    IanM Guest

    Thanks John,

    so negligible inductance ?

    Ian
     
  3. Hello Ian,

    If it's abuot 240V AC, you should replace SINE(0 240 50) with SINE(0 339.4
    50)
    when you want simulate real behavior over time.

    ..TRAN analysis: specify peak value -> SINE(0 339.4 50)

    ..AC analysis: specify RMS-value -> .AC 240

    Best regards,
    Helmut
     
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