I done messed up, and have managed to make a 50% efficient switching converter.
I may have to just grin and use it (look! it's a space heater, too!), but if there's a quick solution I'm open to suggestions.
It's a flyback, going from 3.7V (1-cell LiPo) to 200V. I'm using off-the- shelf transformers.
It was looking a lot better in simulation than in real life, until I added what seems to be a realistic amount of capacitance to the secondary.
So -- anyone see anything I can do with this? Suggestions welcome. Thanks in advance.
Version 4 SHEET 1 4556 1460 WIRE 1808 -352 1696 -352 WIRE 2512 -352 1872 -352 WIRE 2560 -352 2512 -352 WIRE 2944 -352 2560 -352 WIRE 3168 -352 2944 -352 WIRE -144 -304 -240 -304 WIRE 48 -304 -64 -304 WIRE 176 -304 48 -304 WIRE 1520 -304 176 -304 WIRE 2144 -304 1520 -304 WIRE 2416 -304 2320 -304 WIRE 2560 -304 2560 -352 WIRE 2560 -304 2480 -304 WIRE 1520 -272 1520 -304 WIRE 1696 -272 1696 -352 WIRE 2144 -272 2144 -304 WIRE 2320 -272 2320 -304 WIRE 48 -256 48 -304 WIRE 2560 -256 2560 -304 WIRE 3168 -224 3168 -352 WIRE 1712 -192 1696 -192 WIRE 2336 -192 2320 -192 WIRE 48 -160 48 -192 WIRE 1392 -160 1328 -160 WIRE 1520 -160 1520 -192 WIRE 1520 -160 1456 -160 WIRE 1712 -160 1712 -192 WIRE 2016 -160 1952 -160 WIRE 2144 -160 2144 -192 WIRE 2144 -160 2080 -160 WIRE 2336 -160 2336 -192 WIRE 2560 -160 2560 -192 WIRE 1328 -64 1328 -160 WIRE 1728 -64 1328 -64 WIRE 1952 -64 1952 -160 WIRE 1952 -64 1728 -64 WIRE 2352 -64 1952 -64 WIRE 2512 -64 2352 -64 WIRE 192 -48 64 -48 WIRE 256 -48 192 -48 WIRE 416 -48 256 -48 WIRE 672 -48 416 -48 WIRE 896 -48 672 -48 WIRE 1136 -48 896 -48 WIRE 1872 -48 1136 -48 WIRE 2512 -48 2512 -64 WIRE 3168 -48 3168 -144 WIRE 416 -32 416 -48 WIRE 256 -16 256 -48 WIRE 1136 -16 1136 -48 WIRE 1520 -16 1520 -160 WIRE 1872 -16 1872 -48 WIRE 2144 -16 2144 -160 WIRE 672 0 672 -48 WIRE 2352 0 2352 -64 WIRE -240 32 -240 -304 WIRE 64 32 64 -48 WIRE 1040 32 1008 32 WIRE 1296 32 1232 32 WIRE 1776 32 1744 32 WIRE 2032 32 1968 32 WIRE 3120 32 3072 32 WIRE 2512 48 2512 32 WIRE 256 64 256 48 WIRE 416 64 416 48 WIRE 512 64 416 64 WIRE 896 64 896 -48 WIRE 896 64 832 64 WIRE 1008 64 1008 32 WIRE 1040 64 1008 64 WIRE 1296 64 1296 32 WIRE 1296 64 1232 64 WIRE 1472 64 1296 64 WIRE 1744 64 1744 32 WIRE 1776 64 1744 64 WIRE 2032 64 2032 32 WIRE 2032 64 1968 64 WIRE 2096 64 2032 64 WIRE 3072 80 3072 32 WIRE 3168 96 3168 48 WIRE 2352 112 2352 64 WIRE 1136 128 1136 112 WIRE -240 144 -240 112 WIRE 64 144 64 112 WIRE 2512 144 2512 112 WIRE 336 160 288 160 WIRE 512 160 400 160 WIRE 928 160 832 160 WIRE 1008 160 1008 64 WIRE 1008 160 928 160 WIRE 1744 160 1744 64 WIRE 1744 160 1008 160 WIRE 288 192 288 160 WIRE 1872 192 1872 112 WIRE 3072 192 3072 160 WIRE 2496 208 2400 208 WIRE 1520 240 1520 80 WIRE 2144 240 2144 80 WIRE 2144 240 1520 240 WIRE 2400 240 2400 208 WIRE 512 256 64 256 WIRE 960 256 832 256 WIRE 1088 256 960 256 WIRE 1184 256 1088 256 WIRE 1408 256 1264 256 WIRE 1520 256 1520 240 WIRE 1520 256 1408 256 WIRE 3488 272 3440 272 WIRE 3488 288 3488 272 WIRE 64 304 64 256 WIRE 2944 304 2944 -352 WIRE 240 352 224 352 WIRE 352 352 320 352 WIRE 480 352 352 352 WIRE 512 352 480 352 WIRE 960 352 832 352 WIRE 1792 352 960 352 WIRE 1904 352 1792 352 WIRE 1952 352 1904 352 WIRE 2096 352 2032 352 WIRE 2400 352 2400 320 WIRE 1408 384 1408 256 WIRE 352 400 352 352 WIRE 3488 400 3488 368 WIRE 896 416 896 64 WIRE 1088 416 1088 256 WIRE 1520 416 1520 256 WIRE 1792 416 1792 352 WIRE 1904 432 1904 352 WIRE 2048 432 1904 432 WIRE 2192 432 2128 432 WIRE 2240 432 2192 432 WIRE 2288 432 2240 432 WIRE 2400 432 2368 432 WIRE 2544 432 2464 432 WIRE 64 464 64 384 WIRE 416 464 416 64 WIRE 672 464 672 416 WIRE 2496 464 2496 208 WIRE 2544 480 2544 432 WIRE 2544 480 2528 480 WIRE 3264 480 2544 480 WIRE 3376 480 3344 480 WIRE 3392 480 3376 480 WIRE 352 496 352 464 WIRE 1408 496 1408 464 WIRE 1408 496 1296 496 WIRE 2240 496 2240 432 WIRE 2464 496 2240 496 WIRE 1408 512 1408 496 WIRE 2800 512 2528 512 WIRE 2944 512 2944 384 WIRE 2944 512 2800 512 WIRE 3392 512 3392 480 WIRE 896 528 896 480 WIRE 1088 528 1088 480 WIRE 1520 528 1520 496 WIRE 2944 528 2944 512 WIRE 2800 544 2800 512 WIRE 1792 560 1792 496 WIRE 2496 560 2496 528 WIRE 416 592 416 544 WIRE 1408 608 1408 576 WIRE 2800 640 2800 608 WIRE 2944 640 2944 608 WIRE 3392 640 3392 592 FLAG -240 144 0 FLAG 672 464 0 FLAG 1520 528 0 FLAG 896 528 0 FLAG 64 464 0 FLAG 928 160 Vg1 FLAG 2560 -160 0 FLAG 3168 96 0 FLAG 3072 192 0 FLAG 48 -160 0 FLAG 256 64 0 FLAG 2352 112 0 FLAG 2512 -352 Vout FLAG 1728 -64 Vsnub FLAG 176 -304 Vin FLAG 480 352 Vc FLAG 960 352 Vfbx FLAG 1136 128 0 FLAG 1872 192 0 FLAG 192 -48 Vgs FLAG 416 592 0 FLAG 2512 144 0 FLAG 3392 640 0 FLAG 2496 560 0 FLAG 3440 272 Vvg FLAG 3488 400 0 FLAG 2944 640 0 FLAG 2192 432 Vvcmd FLAG 2096 352 Vvg FLAG 224 352 Vvg FLAG 2400 352 0 FLAG 1792 560 0 FLAG 352 496 0 FLAG 64 144 0 FLAG 3376 480 Vcmd FLAG 1296 496 VHV_Curr FLAG 2336 -160 0 FLAG 1712 -160 0 FLAG 1408 608 0 FLAG 1088 528 0 FLAG 960 256 Vsense FLAG 288 192 0 FLAG 2800 640 0 SYMBOL voltage -240 16 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=10m SYMATTR InstName V1 SYMATTR Value PWL(0 0 1m 3.2) SYMBOL PowerProducts\\LT3757A 672 208 R0 SYMATTR InstName U1 SYMBOL cap 880 416 R0 SYMATTR InstName C1 SYMATTR Value 4.7? SYMBOL res 1504 400 R0 SYMATTR InstName R1 SYMATTR Value 3m SYMBOL nmos 1472 -16 R0 SYMATTR InstName M1 SYMATTR Value BSZ067N06LS3 SYMBOL ind2 1504 -176 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L1 SYMATTR Value 2.4? SYMATTR SpiceLine Rser=12.5m Rpar=20 SYMATTR Type ind SYMBOL res 2144 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 100k SYMBOL res 48 288 R0 SYMATTR InstName R4 SYMATTR Value 270k SYMBOL cap 2544 -256 R0 SYMATTR InstName C4 SYMATTR Value 1? SYMBOL res 3152 -240 R0 SYMATTR InstName R11 SYMATTR Value 2.80k SYMBOL nmos 3120 -48 R0 SYMATTR InstName M3 SYMATTR Value FDS2734 SYMBOL voltage 3072 64 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 12 4m 1u 1u 500u 1m 5) SYMBOL cap 32 -256 R0 SYMATTR InstName C7 SYMATTR Value 2000? SYMATTR SpiceLine Rser=14m SYMBOL cap 240 -16 R0 SYMATTR InstName C9 SYMATTR Value 10? SYMBOL ind2 1712 -288 M0 SYMATTR InstName L2 SYMATTR Value 1310? SYMATTR Type ind SYMATTR SpiceLine Rser=3 Cpar=2n SYMBOL diode 1808 -336 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value RFN2L6S SYMBOL cap 2336 0 R0 SYMATTR InstName C3 SYMATTR Value 10? SYMBOL nmos 2096 -16 R0 SYMATTR InstName M2 SYMATTR Value BSZ067N06LS3 SYMBOL ind2 2128 -176 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L3 SYMATTR Value 2.4? SYMATTR SpiceLine Rser=12.5m Rpar=20 SYMATTR Type ind SYMBOL ind2 2336 -288 M0 SYMATTR InstName L4 SYMATTR Value 1310? SYMATTR Type ind SYMATTR SpiceLine Rser=3 Cpar=2n SYMBOL diode 2416 -288 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D4 SYMATTR Value RFN2L6S SYMBOL schottky 1456 -176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D5 SYMATTR Value UPSC600 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 2080 -176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D6 SYMATTR Value UPSC600 SYMATTR Description Diode SYMATTR Type diode SYMBOL ZXGD3001E6 1136 48 R0 SYMATTR InstName U2 SYMBOL ZXGD3001E6 1872 48 R0 SYMATTR InstName U3 SYMBOL res 400 -48 R0 SYMATTR InstName R8 SYMATTR Value 301k SYMBOL res 400 448 R0 SYMATTR InstName R10 SYMATTR Value 100k SYMBOL zener 2528 112 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D7 SYMATTR Value EDZV30B SYMATTR Description Diode SYMATTR Type diode SYMBOL res 2496 -64 R0 SYMATTR InstName R13 SYMATTR Value 100 SYMBOL voltage 3392 496 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PWL(0 0 1.5m 0 3m 4) SYMBOL Opamps\\UniversalOpamp2 2496 496 M0 SYMATTR InstName U5 SYMBOL voltage 3488 272 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V4 SYMATTR Value 1.6 SYMBOL res 2928 512 R0 SYMATTR InstName R14 SYMATTR Value 25.5k SYMBOL res 2928 288 R0 SYMATTR InstName R15 SYMATTR Value 1.24meg SYMBOL res 3360 464 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R17 SYMATTR Value 25.5k SYMBOL res 2048 336 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 4.99k SYMBOL res 224 368 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R6 SYMATTR Value 100k SYMBOL voltage 2400 224 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V5 SYMATTR Value 5 SYMBOL res 1776 400 R0 SYMATTR InstName R12 SYMATTR Value 174meg SYMBOL cap 336 400 R0 SYMATTR InstName C10 SYMATTR Value 33p SYMBOL voltage 64 16 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=10 SYMATTR InstName V6 SYMATTR Value PWL(0 0 100u 0 101u 12) SYMBOL res 2384 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 100k SYMBOL cap 2464 416 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL cap 1392 512 R0 SYMATTR InstName C5 SYMATTR Value 100n SYMBOL res 1392 368 R0 SYMATTR InstName R7 SYMATTR Value 1k SYMBOL res 1280 240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 100 SYMBOL cap 1072 416 R0 SYMATTR InstName C6 SYMATTR Value 1n SYMBOL cap 400 144 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C8 SYMATTR Value 33n SYMBOL cap 2784 544 R0 SYMATTR InstName C11 SYMATTR Value 330p SYMBOL ind -160 -288 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L5 SYMATTR Value 220n TEXT -208 560 Left 2 !.tran 10m startup TEXT 1312 -240 Left 2 !K1 L1 L2 0.985 TEXT 1296 -272 Left 2 ;Wurth 760871113 TEXT 1936 -240 Left 2 !K2 L3 L4 0.985 TEXT 1912 -272 Left 2 ;Wurth 760871113 TEXT -208 592 Left 2 !.lib ZXGD3001E6.spicemodel.lib TEXT -200 624 Left 2 !.ic V(Vsnub)=30