G
George Herold
- Jan 1, 1970
- 0
So the thread by Vlad about the Johnson noise of magnetic core losses got me thinking about other types of damping. And I was wondering if there is an electrical equivalent of friction? It seems to me that it could be a constant voltage loss. So maybe just some diodes in an LC circuit?
It seems to work, here’s a spice file.
Any thoughts or other ideas are welcome.
(Something that worked at less than 100 V would be nice.)
George H.
Version 4
SHEET 1 1012 680
WIRE 144 -592 -48 -592
WIRE -48 -560 -48 -592
WIRE 288 -464 192 -464
WIRE -48 -432 -48 -480
WIRE 400 -432 320 -432
WIRE 544 -432 464 -432
WIRE 288 -416 288 -464
WIRE 144 -384 144 -592
WIRE 192 -384 192 -464
WIRE 0 -336 -224 -336
WIRE 128 -336 80 -336
WIRE 288 -336 208 -336
WIRE 320 -336 320 -432
WIRE 320 -336 288 -336
WIRE 400 -336 320 -336
WIRE 544 -336 544 -432
WIRE 544 -336 464 -336
WIRE -224 -288 -224 -336
WIRE 544 -256 544 -336
WIRE 288 -240 288 -336
WIRE -224 -144 -224 -208
WIRE 288 -144 288 -176
WIRE 288 -144 -224 -144
WIRE 544 -144 544 -176
WIRE 544 -144 288 -144
WIRE 288 -112 288 -144
FLAG -48 -432 0
FLAG 288 -112 0
FLAG 288 -416 0
SYMBOL voltage -48 -576 R0
WINDOW 0 -74 28 Left 2
WINDOW 3 -235 -36 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 0 1n 1n 1 200 1)
SYMBOL res 96 -352 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 1
SYMBOL cap 272 -240 R0
WINDOW 3 27 56 Left 2
SYMATTR InstName C11
SYMATTR Value 1m
SYMBOL ind 528 -272 R0
WINDOW 0 30 34 Left 2
SYMATTR InstName L1
SYMATTR Value 1m
SYMBOL sw 224 -336 R90
SYMATTR InstName S1
SYMATTR Value MYSW
SYMBOL voltage -224 -304 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 1000
SYMBOL diode 464 -352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMBOL diode 400 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
TEXT -200 -32 Left 2 !.tran 0 2 .9 1m
TEXT 64 -32 Left 2 !.model MYSW SW(Ron=1 Roff=1Meg Vt=.5 Vh=-.4)
It seems to work, here’s a spice file.
Any thoughts or other ideas are welcome.
(Something that worked at less than 100 V would be nice.)
George H.
Version 4
SHEET 1 1012 680
WIRE 144 -592 -48 -592
WIRE -48 -560 -48 -592
WIRE 288 -464 192 -464
WIRE -48 -432 -48 -480
WIRE 400 -432 320 -432
WIRE 544 -432 464 -432
WIRE 288 -416 288 -464
WIRE 144 -384 144 -592
WIRE 192 -384 192 -464
WIRE 0 -336 -224 -336
WIRE 128 -336 80 -336
WIRE 288 -336 208 -336
WIRE 320 -336 320 -432
WIRE 320 -336 288 -336
WIRE 400 -336 320 -336
WIRE 544 -336 544 -432
WIRE 544 -336 464 -336
WIRE -224 -288 -224 -336
WIRE 544 -256 544 -336
WIRE 288 -240 288 -336
WIRE -224 -144 -224 -208
WIRE 288 -144 288 -176
WIRE 288 -144 -224 -144
WIRE 544 -144 544 -176
WIRE 544 -144 288 -144
WIRE 288 -112 288 -144
FLAG -48 -432 0
FLAG 288 -112 0
FLAG 288 -416 0
SYMBOL voltage -48 -576 R0
WINDOW 0 -74 28 Left 2
WINDOW 3 -235 -36 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 0 1n 1n 1 200 1)
SYMBOL res 96 -352 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 1
SYMBOL cap 272 -240 R0
WINDOW 3 27 56 Left 2
SYMATTR InstName C11
SYMATTR Value 1m
SYMBOL ind 528 -272 R0
WINDOW 0 30 34 Left 2
SYMATTR InstName L1
SYMATTR Value 1m
SYMBOL sw 224 -336 R90
SYMATTR InstName S1
SYMATTR Value MYSW
SYMBOL voltage -224 -304 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 1000
SYMBOL diode 464 -352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMBOL diode 400 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
TEXT -200 -32 Left 2 !.tran 0 2 .9 1m
TEXT 64 -32 Left 2 !.model MYSW SW(Ron=1 Roff=1Meg Vt=.5 Vh=-.4)