I've been messing about chopping the voltage supplied to an inductor in spice, hoping to see a sharp spike of x thousand volts as the magnetic field collapses. So far though, no joy. I can only imagine I've not contrived an appropriate circuit that would demonstrate the effect. Can anyone post a simple schematic that does illustrate this property of inductors?
Thanks,
p.
Paul,
This is the basis of "Boost" DC/DC converters. Below is an LTspice schematic doing this open loop.
--Mike
Version 4 SHEET 1 1056 680 WIRE 160 384 160 368 WIRE 160 288 160 272 WIRE 160 160 32 160 WIRE 32 160 32 176 WIRE 32 256 32 272 WIRE 0 448 0 416 WIRE 0 336 0 304 WIRE 0 304 112 304 WIRE 160 272 224 272 WIRE 288 272 336 272 WIRE 160 272 160 256 WIRE 336 272 336 288 WIRE 336 352 336 384 WIRE 160 176 160 160 FLAG 32 272 0 FLAG 160 384 0 FLAG 112 352 0 FLAG 0 448 0 FLAG 336 384 0 SYMBOL ind 144 160 R0 SYMATTR InstName L1 SYMATTR Value 10µ SYMBOL sw 160 384 M180 WINDOW 0 28 89 Left 0 WINDOW 3 23 20 Left 0 SYMATTR InstName S1 SYMBOL voltage 32 160 R0 WINDOW 3 27 94 Left 0 SYMATTR Value 5 SYMATTR InstName V1 SYMBOL voltage 0 320 R0 SYMATTR InstName V2 SYMATTR Value PULSE(0 1 0 1u 1u 4u 10u) SYMBOL diode 224 288 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMBOL cap 320 288 R0 SYMATTR InstName C1 SYMATTR Value 1µ TEXT 432 416 Left 0 !.model SW SW(Ron=.1 Roff=10Meg Vt=.5 Vh=--.4) TEXT 432 392 Left 0 !.model D D(Ron=1. Roff=10Meg) TEXT 430 364 Left 0 !.tran 10m
Many thanks, Mike. I'll give it a try.
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