New(?) Transformer model for LTspice

Could be shit and you'll have to fiddle to see what is or isn't going on.....

I wanted to dop down some windings and then dop down a core and connect them together with some idea of core saturation.....

Blah blah blah.

Anyway

Winding Model

Version 4 SHEET 1 880 680 WIRE -256 144 -288 144 WIRE -144 144 -176 144 WIRE 0 144 -64 144 WIRE 176 144 144 144 WIRE 256 144 224 144 WIRE -144 208 -144 144 WIRE -64 208 -64 144 WIRE 224 208 224 144 WIRE 176 224 176 144 WIRE -144 320 -144 288 WIRE -144 320 -288 320 WIRE -64 320 -64 288 WIRE 176 320 176 272 WIRE 176 320 -64 320 WIRE 224 320 224 288 WIRE 224 320 176 320 WIRE -64 352 -64 320 FLAG 0 144 Hf IOPIN 0 144 Out FLAG 256 144 LV IOPIN 256 144 Out FLAG 144 144 DBf IOPIN 144 144 In FLAG -288 144 1 IOPIN -288 144 In FLAG -288 320 2 IOPIN -288 320 In FLAG -64 352 0 SYMBOL res -160 128 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName RL SYMATTR Value {RT*N**2} SYMBOL e 224 192 R0 WINDOW 0 38 42 Left 0 WINDOW 3 36 65 Left 0 SYMATTR InstName E1 SYMATTR Value {N} SYMBOL bv -144 192 R0 WINDOW 0 -134 41 Left 0 WINDOW 3 -134 67 Left 0 SYMATTR InstName B1 SYMATTR Value V=V(LV) SYMBOL bi2 -64 208 R0 WINDOW 0 38 29 Left 0 WINDOW 3 38 55 Left 0 SYMATTR InstName B2 SYMATTR Value I=N*I(B1)

Winding Symbol

Version 4 SymbolType BLOCK LINE Normal -32 -32 -16 -32 LINE Normal -32 32 -16 32 LINE Normal 64 -32 48 -32 LINE Normal 64 32 48 32 RECTANGLE Normal 48 48 -16 -48 CIRCLE Normal -2 -36 -10 -28 TEXT 6 -33 Left 0 Hf TEXT 3 32 Left 0 DBf PIN -32 -32 NONE 8 PINATTR PinName 1 PINATTR SpiceOrder 1 PIN -32 32 NONE 8 PINATTR PinName 2 PINATTR SpiceOrder 2 PIN 64 -32 NONE 8 PINATTR PinName Hf PINATTR SpiceOrder 3 PIN 64 32 NONE 8 PINATTR PinName DBf PINATTR SpiceOrder 4

Core Model

Version 4 SHEET 1 2328 820 WIRE 768 176 736 176 WIRE 1088 176 1024 176 WIRE 1120 176 1088 176 WIRE 1312 176 1264 176 WIRE 1488 176 1440 176 WIRE 736 240 736 176 WIRE 1024 240 1024 176 WIRE 1088 240 1088 176 WIRE 1312 240 1312 176 WIRE 1440 240 1440 176 WIRE 736 352 736 320 WIRE 1024 352 1024 320 WIRE 1024 352 736 352 WIRE 1088 352 1088 320 WIRE 1088 352 1024 352 WIRE 1312 352 1312 320 WIRE 1312 352 1088 352 WIRE 1440 352 1440 320 WIRE 1440 352 1312 352 WIRE 736 384 736 352 FLAG 1488 176 Us IOPIN 1488 176 Out FLAG 768 176 Bf IOPIN 768 176 Out FLAG 736 384 0 FLAG 1264 176 Hf IOPIN 1264 176 In FLAG 1120 176 DBf IOPIN 1120 176 Out SYMBOL bv 1440 224 R0 WINDOW 0 -419 154 Left 0 WINDOW 3 -418 174 Left 0 SYMATTR InstName B3 SYMATTR Value V=Ue*(1/Ue+exp(-((V(Bf))**2)/(2*Bs**2))) SYMBOL bv 736 224 R0 WINDOW 0 37 149 Left 0 WINDOW 3 38 173 Left 0 SYMATTR InstName B1 SYMATTR Value V=Uo*V(Us)*I(VHF)/Le SYMBOL voltage 1312 224 R0 WINDOW 0 36 48 Left 0 WINDOW 3 37 72 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName VHF SYMATTR Value 0V SYMBOL bi 1024 320 R180 WINDOW 0 82 47 Left 0 WINDOW 3 39 27 Left 0 SYMATTR InstName B2 SYMATTR Value I=V(Bf) SYMBOL ind 1072 224 R0 WINDOW 0 38 32 Left 0 WINDOW 3 39 57 Left 0 WINDOW 39 39 83 Left 0 SYMATTR InstName L1 SYMATTR Value {Ae} SYMATTR SpiceLine Rpar={1/Ae}

Core Symbol

Version 4 SymbolType BLOCK LINE Normal -48 0 -32 0 LINE Normal 80 0 64 0 LINE Normal 80 32 64 32 RECTANGLE Normal 64 48 -32 -16 TEXT -29 0 Left 0 Hf TEXT 16 0 Left 0 DBf TEXT 34 31 Left 0 Bf PIN -48 0 NONE 8 PINATTR PinName Hf PINATTR SpiceOrder 1 PIN 80 0 NONE 8 PINATTR PinName DBf PINATTR SpiceOrder 2 PIN 80 32 NONE 8 PINATTR PinName Bf PINATTR SpiceOrder 3

If that works then cleverer people than what I am will be able to work it out and either rubbish it or make it better/extend it.

What you do is dop down some windings for your transformer, right click on them and give them parameters for RT, resistance of a turn, and N, number of turns.

Then you dop down a core and give it parameters for Uo (4*PI*1E-7) Ae, Le, Ue and Bs (saturation flux density).

Tie all the Hf and Dbf terminals together and away you might go.

Does inductors too. Just use a single winding and core, give em your guesses and Hf and Dbf together.

DNA