"John Fields" wrote in message
...

Download all the files into a single folder and then run ZCD7.asc.

John Fields


Done that and wondering: why is the sim taking so long? Three and a half
hours CPU time for a single run from start till finish at essentially 100%
CPU load. OK, that was less than 15 minutes real "wall clock" time (on a
dual Opteron system with 16 cores total), but still, that sim takes more
than plenty of time for what it does. I think, it dislikes LTSpice's
"alternate" solver in some strange way (or I've got some tolerance or
stepping parameters somewhere off-kilter).

BTW, it looks fine with a sinewave, but take a look at the version below -
with a really messy SNAFU mains like you'd sometimes get in places with a
lot of thin wires and "solar" inverters. Of course the waveform of the
"noise" is not realistic, it's just "something messy" made up in order to
simulate effects of non-deterministic stuff happening when a lot of poorly
filtered switchers "get their way", but still, some "interesting" reactions
from the circuit (slightly modified .asc below, all else being the same):


Version 4
SHEET 1 1172 916
WIRE -1072 -544 -1104 -544
WIRE -672 -544 -848 -544
WIRE -336 -544 -400 -544
WIRE -2432 -512 -2512 -512
WIRE -1728 -512 -2336 -512
WIRE -1600 -512 -1728 -512
WIRE -1440 -512 -1600 -512
WIRE -1360 -512 -1440 -512
WIRE -1328 -512 -1360 -512
WIRE -1104 -512 -1104 -544
WIRE -1072 -512 -1104 -512
WIRE -688 -512 -848 -512
WIRE -672 -512 -672 -544
WIRE -624 -512 -672 -512
WIRE -336 -512 -400 -512
WIRE -1104 -480 -1104 -512
WIRE -1072 -480 -1104 -480
WIRE -704 -480 -848 -480
WIRE -688 -480 -688 -512
WIRE -624 -480 -688 -480
WIRE -336 -480 -400 -480
WIRE -1728 -464 -1728 -512
WIRE -1440 -464 -1440 -512
WIRE -1360 -464 -1360 -512
WIRE -1104 -448 -1104 -480
WIRE -1072 -448 -1104 -448
WIRE -768 -448 -848 -448
WIRE -704 -448 -704 -480
WIRE -624 -448 -704 -448
WIRE -336 -448 -400 -448
WIRE -2192 -432 -2256 -432
WIRE -2064 -432 -2128 -432
WIRE -2016 -432 -2064 -432
WIRE -1904 -432 -1952 -432
WIRE -1840 -432 -1904 -432
WIRE -2512 -416 -2512 -512
WIRE -1104 -416 -1104 -448
WIRE -384 -384 -400 -384
WIRE -240 -368 -272 -368
WIRE -2064 -352 -2064 -432
WIRE -2256 -336 -2256 -432
WIRE -2224 -336 -2256 -336
WIRE -2112 -336 -2144 -336
WIRE -1840 -336 -1840 -432
WIRE -1536 -336 -1680 -336
WIRE -1520 -336 -1536 -336
WIRE -1440 -336 -1440 -384
WIRE -1440 -336 -1456 -336
WIRE -1360 -336 -1360 -400
WIRE -1360 -336 -1440 -336
WIRE -1296 -336 -1360 -336
WIRE -1168 -320 -1184 -320
WIRE -1072 -320 -1168 -320
WIRE -624 -320 -720 -320
WIRE -1680 -304 -1680 -336
WIRE -1296 -304 -1312 -304
WIRE -2256 -288 -2256 -336
WIRE -2112 -288 -2256 -288
WIRE -1072 -288 -1136 -288
WIRE -624 -288 -688 -288
WIRE -1312 -272 -1312 -304
WIRE -2064 -240 -2064 -272
WIRE -2336 -224 -2336 -512
WIRE -1600 -224 -1600 -512
WIRE -1728 -192 -1728 -384
WIRE -1632 -192 -1728 -192
WIRE -1536 -192 -1536 -336
WIRE -1536 -192 -1552 -192
WIRE -2432 -160 -2432 -512
WIRE -2064 -160 -2432 -160
WIRE -1840 -160 -1840 -256
WIRE -1680 -160 -1680 -224
WIRE -1680 -160 -1840 -160
WIRE -1632 -160 -1680 -160
WIRE -2064 -128 -2432 -128
WIRE -1536 -128 -1536 -192
WIRE -1520 -128 -1536 -128
WIRE -1440 -128 -1456 -128
WIRE -1360 -128 -1440 -128
WIRE -1296 -128 -1360 -128
WIRE -2256 -112 -2256 -288
WIRE -2192 -112 -2256 -112
WIRE -2064 -112 -2064 -128
WIRE -2064 -112 -2128 -112
WIRE -2000 -112 -2064 -112
WIRE -1904 -112 -1904 -432
WIRE -1904 -112 -1936 -112
WIRE -1616 -112 -1616 -128
WIRE -1600 -112 -1600 -128
WIRE -1600 -112 -1616 -112
WIRE -1584 -112 -1584 -128
WIRE -1584 -112 -1600 -112
WIRE -720 -112 -720 -320
WIRE -720 -112 -1184 -112
WIRE -624 -112 -624 -224
WIRE -384 -112 -384 -352
WIRE -384 -112 -624 -112
WIRE -1072 -80 -1072 -224
WIRE -832 -80 -1072 -80
WIRE -1440 -64 -1440 -128
WIRE -1360 -64 -1360 -128
WIRE -2064 -48 -2064 -112
WIRE -1840 -48 -1840 -160
WIRE -1728 -48 -1728 -192
WIRE -1072 0 -1104 0
WIRE -784 0 -848 0
WIRE -768 0 -768 -448
WIRE -624 0 -768 0
WIRE -336 0 -400 0
WIRE -1104 32 -1104 0
WIRE -1072 32 -1104 32
WIRE -800 32 -848 32
WIRE -784 32 -784 0
WIRE -624 32 -784 32
WIRE -336 32 -400 32
WIRE -2336 48 -2336 -144
WIRE -2304 48 -2336 48
WIRE -1104 64 -1104 32
WIRE -1072 64 -1104 64
WIRE -816 64 -848 64
WIRE -800 64 -800 32
WIRE -624 64 -800 64
WIRE -336 64 -400 64
WIRE -2512 80 -2512 -336
WIRE -2432 80 -2432 -128
WIRE -2432 80 -2512 80
WIRE -2336 80 -2336 48
WIRE -2256 80 -2256 -112
WIRE -2256 80 -2336 80
WIRE -2064 80 -2064 32
WIRE -2064 80 -2256 80
WIRE -1840 80 -1840 32
WIRE -1840 80 -2064 80
WIRE -1728 80 -1728 32
WIRE -1728 80 -1840 80
WIRE -1616 80 -1616 -112
WIRE -1616 80 -1728 80
WIRE -1440 80 -1440 16
WIRE -1440 80 -1616 80
WIRE -1360 80 -1360 0
WIRE -1360 80 -1440 80
WIRE -1296 80 -1360 80
WIRE -1136 80 -1136 -288
WIRE -1136 80 -1216 80
WIRE -1104 96 -1104 64
WIRE -1072 96 -1104 96
WIRE -816 96 -816 64
WIRE -624 96 -816 96
WIRE -336 96 -400 96
WIRE -1104 128 -1104 96
WIRE -832 160 -832 -80
WIRE -832 160 -848 160
WIRE -384 160 -384 -112
WIRE -384 160 -400 160
WIRE -2336 176 -2336 80
WIRE -1168 224 -1168 -320
WIRE -1072 224 -1168 224
WIRE -720 224 -720 -112
WIRE -624 224 -720 224
WIRE -1136 256 -1136 80
WIRE -1072 256 -1136 256
WIRE -688 256 -688 -288
WIRE -624 256 -688 256
WIRE -1536 320 -1536 -128
WIRE -1072 320 -1536 320
WIRE -1072 416 -1072 320
WIRE -624 416 -624 320
WIRE -624 416 -1072 416
WIRE -1136 448 -1136 256
WIRE -688 448 -688 256
WIRE -688 448 -1136 448
FLAG -1296 -96 Vcc
FLAG -1312 -272 0
FLAG -1328 -512 Vcc
FLAG -1072 -256 Vcc
FLAG -1072 288 Vcc
FLAG -1104 -416 0
FLAG -624 -256 0V
FLAG -624 288 0V
FLAG -624 -544 0V
FLAG -1104 128 0
FLAG -1072 -352 0V
FLAG -1072 192 0V
FLAG -624 -352 0V
FLAG -624 192 0V
FLAG -2336 176 0
FLAG -2304 48 0V
SYMBOL CD4001B -1248 -384 R0
SYMATTR InstName U8
SYMBOL CD4081B -1248 -176 R0
SYMATTR InstName U3
SYMBOL cap -1456 -352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 220p
SYMBOL cap -1456 -144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 220p
SYMBOL res -1456 -80 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res -1456 -480 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res -1744 -480 R0
SYMATTR InstName R9
SYMATTR Value 100K
SYMBOL res -1744 -64 R0
SYMATTR InstName R10
SYMATTR Value 100k
SYMBOL voltage -2064 -256 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value SINE(0 170 50)
SYMATTR InstName V4
SYMBOL res -2080 -64 R0
SYMATTR InstName R11
SYMATTR Value 1g
SYMBOL voltage -2336 -240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value 5
SYMBOL res -1856 -352 R0
SYMATTR InstName R12
SYMATTR Value 100K
SYMBOL res -1856 -64 R0
SYMATTR InstName R13
SYMATTR Value 3030
SYMBOL diode -2016 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D7
SYMATTR Value MURS120
SYMBOL CD4516B -960 -128 M180
SYMATTR InstName U2
SYMBOL CD4516B -960 416 M180
SYMATTR InstName U6
SYMBOL CD4516B -512 -128 M180
SYMATTR InstName U7
SYMBOL CD4516B -512 416 M180
SYMATTR InstName U9
SYMBOL voltage -1200 80 M270
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 44 7 VBottom 2
SYMATTR Value PULSE(0 5 0 10n 10n 10u 20u)
SYMATTR InstName V6
SYMBOL CD4001B -336 -432 R0
WINDOW 0 43 84 Left 2
WINDOW 3 19 109 Left 2
SYMATTR InstName U12
SYMBOL diode -2192 -416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D8
SYMATTR Value MURS120
SYMBOL diode -2192 -96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D9
SYMATTR Value MURS120
SYMBOL diode -2000 -96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D10
SYMATTR Value MURS120
SYMBOL diode -1344 -400 R180
WINDOW 0 -43 38 Left 2
WINDOW 3 -74 -5 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode -1344 0 R180
WINDOW 0 -43 38 Left 2
WINDOW 3 -74 -5 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL Comparators\\LT1711 -1600 -176 R0
WINDOW 0 -97 37 Left 2
WINDOW 3 -122 70 Left 2
SYMATTR InstName U4
SYMBOL voltage -2128 -336 R90
WINDOW 0 -33 90 VRight 2
WINDOW 3 -242 110 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 3m 1E-6 1E-6)
SYMBOL sw -2064 -256 M180
WINDOW 0 32 15 Left 2
WINDOW 3 32 44 Left 2
SYMATTR InstName S1
SYMBOL res -1696 -320 R0
SYMATTR InstName R1
SYMATTR Value 1meg
SYMBOL voltage -2512 -432 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value SFFM(0 10 3700 80 170)
SYMATTR InstName V1
TEXT -2320 112 Left 2 !.tran 0 .05 0 1u uic
TEXT -2320 144 Left 2 !.include cd4000.lib
TEXT -368 -296 Left 2 ;OUT TO ISOLATOR
TEXT -2024 112 Left 2 !.model SW SW(Ron=1 Roff=10Meg Vt=0.5Vh=0)