initial commit

examples/Educational/NonLinearTransformer.asc

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+Version 4
+SHEET 1 1608 720
+WIRE 704 -16 640 -16
+WIRE 1136 -16 1056 -16
+WIRE 704 0 704 -16
+WIRE 1056 0 1056 -16
+WIRE 864 16 752 16
+WIRE 1008 16 864 16
+WIRE 768 64 752 64
+WIRE 1008 64 992 64
+WIRE 16 80 -32 80
+WIRE 560 80 96 80
+WIRE 608 80 560 80
+WIRE 864 96 864 16
+WIRE 864 96 768 96
+WIRE 992 96 864 96
+WIRE 1344 96 1184 96
+WIRE 560 112 560 80
+WIRE -32 128 -32 80
+WIRE 768 128 768 96
+WIRE 864 128 864 96
+WIRE 992 128 992 96
+WIRE 1344 128 1344 96
+WIRE 608 144 608 80
+WIRE 704 144 704 80
+WIRE 704 144 608 144
+WIRE 720 144 704 144
+WIRE 1056 144 1056 80
+WIRE 1056 144 1040 144
+WIRE 1184 144 1184 96
+WIRE 1184 144 1056 144
+WIRE 640 192 640 -16
+WIRE 640 192 608 192
+WIRE 720 192 640 192
+WIRE 1136 192 1136 -16
+WIRE 1136 192 1040 192
+WIRE 1184 192 1136 192
+WIRE -32 240 -32 208
+WIRE 560 240 560 192
+WIRE 560 240 208 240
+WIRE 608 240 608 192
+WIRE 608 240 560 240
+WIRE 768 240 768 208
+WIRE 864 240 864 208
+WIRE 992 240 992 208
+WIRE 1184 240 1184 192
+WIRE 1344 240 1344 208
+WIRE 1344 240 1184 240
+WIRE 1344 256 1344 240
+WIRE 208 272 208 240
+FLAG 208 272 0
+FLAG -32 240 0
+FLAG 768 64 0
+FLAG 864 240 0
+FLAG 768 240 0
+FLAG 992 240 0
+FLAG 992 64 0
+FLAG 1344 256 0
+SYMBOL ind 576 96 M0
+WINDOW 123 41 68 Left 2
+WINDOW 39 43 91 Left 2
+WINDOW 40 42 117 Left 2
+WINDOW 0 43 16 Left 2
+WINDOW 3 42 42 Left 2
+SYMATTR Value2 A=0.0000251 Lm=0.0198
+SYMATTR SpiceLine Lg=0.0006858 N=1000
+SYMATTR SpiceLine2 Rser=0.
+SYMATTR InstName L1
+SYMATTR Value Hc=16.  Bs=.44 Br=.10
+SYMBOL voltage -32 112 R0
+SYMATTR InstName V1
+SYMATTR Value sine(0 10 100)
+SYMBOL res 112 64 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R1
+SYMATTR Value 1
+SYMBOL g 768 112 R0
+SYMATTR InstName G1
+SYMATTR Value 1
+SYMBOL g 992 112 M0
+SYMATTR InstName G2
+SYMATTR Value 1
+SYMBOL g 704 -16 M0
+WINDOW 0 -11 9 Right 2
+WINDOW 3 -12 103 Right 2
+SYMATTR InstName G3
+SYMATTR Value 1
+SYMBOL g 1056 -16 R0
+SYMATTR InstName G4
+SYMATTR Value 1
+SYMBOL res 848 112 R0
+SYMATTR InstName Rx
+SYMATTR Value 1Meg
+SYMBOL res 1328 112 R0
+SYMATTR InstName Rload
+SYMATTR Value {R}
+TEXT 0 272 Left 2 !.tran 50m
+TEXT 1200 392 Left 2 !.step param R list 1Meg 1
+TEXT 728 -104 Bottom 2 ;1:1 transformer
+TEXT 200 336 Left 2 ;K-statements don't work with the non-linear inductor since the Chan model assumes the\nfield is uniform in the air and core and the field won't be uniform if K != 1.\n \nBut you can model a transformer that saturates by shorting the input of an ideal\ntransformer with an inductor that saturates.  In this example, the cross-coupled\ntransconductances effect an ideal transformer.  The simulation steps the load resistance\nand you can see that peak input current goes down when the secondary isn't open circuit\nsince the core doesn't saturates when the secondary is shielding the core.
+TEXT 768 560 Top 1 ;This example schematic is supplied for informational/educational purposes only.
+LINE Normal 1232 -96 256 -96
+LINE Normal 1232 304 1232 -96
+LINE Normal 256 304 1232 304
+LINE Normal 256 -96 256 304