200V @ 100mA from 3.2V

Mucho mejor:

Andreas is still active in a German NG and was surprised that people still use his software. I never found anything that comes even close.

--
Regards, Joerg 

http://www.analogconsultants.com/

OK I've sketched the outline below. How it works: Q1 delivers a pulse to TF, which charges C2 and C3. C2 is much larger capacity than C3. Now Q3 switches off, and Q2 dumps C2 into the transformer again. The transformed output goes into C3 only, providing double transformation.

NT

Version 4 SHEET 1 880 680 WIRE -384 -48 -784 -48 WIRE -784 -32 -784 -48 WIRE 96 48 -304 48 WIRE -784 64 -784 48 WIRE -384 96 -384 -48 WIRE -304 96 -304 48 WIRE 176 96 -48 96 WIRE 256 96 176 96 WIRE -304 192 -384 192 WIRE -272 192 -304 192 WIRE -112 192 -112 96 WIRE -112 192 -176 192 WIRE -32 192 -48 192 WIRE 96 192 96 48 WIRE 96 192 64 192 WIRE 176 192 176 96 WIRE -272 448 -272 272 WIRE -176 448 -176 272 WIRE 96 448 96 256 WIRE 176 448 176 256 WIRE -48 528 -48 496 FLAG -784 64 0 FLAG -704 64 0 FLAG 176 448 0 FLAG 96 448 0 FLAG -176 448 0 FLAG -272 448 0 SYMBOL voltage -784 -48 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL ind -288 176 R0 SYMATTR InstName L1 SYMBOL ind -160 288 R180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L2 SYMBOL npn -448 96 R0 SYMATTR InstName Q1 SYMBOL npn -240 96 M0 SYMATTR InstName Q2 SYMBOL diode -112 208 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMBOL cap 80 192 R0 SYMATTR InstName C2 SYMBOL cap 160 192 R0 SYMATTR InstName C3 SYMBOL diode -112 112 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMBOL npn -32 256 R270 SYMATTR InstName Q3 TEXT -608 -88 Left 2 !.tran 0 0.001 0 10u startup

Thanks for the post.

But whoa, was this scheme discussed someplace? It seems well suited for student experiment> tabbypurr wrote:

--
 Thanks, 
    - Win

It was just a moment of curiosity, it saves a 2nd transformer/inductor - it could be implemented with an inductor. But there is extra switching. If it's used & has a name I don't know it.

NT

On 01/22/2016 11:01 AM, JM wrote:

Thanks. I spent awhile playing around with it, and it works pretty well if you don't mind the drain ringing like crazy--with a lossless transformer, it comes in at about 95% efficiency, accounting for gate drive.

This schematic probably has horrible line wraps, so I'll put it on my website as well:

Cheers

Phil Hobbs

===================== Version 4 SHEET 1 1408 680 WIRE 448 -16 368 -16 WIRE 576 -16 448 -16 WIRE 816 -16 736 -16 WIRE 992 -16 896 -16 WIRE 1024 -16 992 -16 WIRE 1168 -16 1104 -16 WIRE 448 0 448 -16 WIRE 576 0 576 -16 WIRE 736 16 736 -16 WIRE 992 16 992 -16 WIRE 1168 16 1168 -16 WIRE -192 32 -224 32 WIRE -112 32 -192 32 WIRE 64 32 -112 32 WIRE 224 32 64 32 WIRE 368 32 368 -16 WIRE 64 64 64 32 WIRE 448 80 448 64 WIRE 528 80 448 80 WIRE 576 80 576 64 WIRE 656 80 576 80 WIRE -112 96 -112 32 WIRE 224 96 224 32 WIRE 736 112 736 96 WIRE 992 112 992 80 WIRE 1168 112 1168 80 WIRE 64 160 64 144 WIRE -160 176 -192 176 WIRE 368 176 368 112 WIRE 448 176 448 144 WIRE 448 176 368 176 WIRE 576 176 576 144 WIRE 576 176 448 176 WIRE 448 192 368 192 WIRE 656 192 656 80 WIRE 720 192 656 192 WIRE 752 192 720 192 WIRE 160 208 96 208 WIRE 224 208 224 176 WIRE 224 208 160 208 WIRE 448 208 448 192 WIRE 752 208 752 192 WIRE 96 224 96 208 WIRE 368 224 368 192 WIRE -192 240 -192 176 WIRE -176 240 -192 240 WIRE -112 240 -112 192 WIRE -80 240 -112 240 WIRE 32 240 0 240 WIRE 224 240 224 208 WIRE 656 240 656 192 WIRE 528 272 528 80 WIRE -192 288 -192 240 WIRE -192 288 -256 288 WIRE -176 288 -192 288 WIRE 32 304 32 240 WIRE 48 304 32 304 WIRE 752 304 752 288 WIRE 752 304 656 304 WIRE 752 320 752 304 WIRE -256 336 -256 288 WIRE 224 336 224 304 WIRE 368 336 368 304 WIRE 368 336 224 336 WIRE 432 336 368 336 WIRE 528 336 528 272 WIRE 528 336 496 336 WIRE -112 352 -112 336 WIRE 96 352 96 320 WIRE 528 368 528 336 WIRE 848 368 768 368 WIRE 992 368 928 368 WIRE 1040 368 992 368 WIRE 1184 368 1120 368 WIRE 768 400 768 368 WIRE 992 400 992 368 WIRE 1184 400 1184 368 WIRE -256 432 -256 416 WIRE 528 448 528 432 WIRE 768 496 768 480 WIRE 992 496 992 464 WIRE 1184 496 1184 464 FLAG 448 208 0 FLAG 528 448 0 FLAG 64 160 0 FLAG -256 432 0 FLAG 752 320 0 FLAG 720 192 +HV FLAG 528 272 Catch FLAG 160 208 Drain FLAG 768 496 0 FLAG 992 496 0 FLAG -192 32 V_IN FLAG 736 112 0 FLAG 992 112 0 FLAG 96 352 0 FLAG 1184 496 0 FLAG 1184 368 P_IN FLAG 1168 112 0 FLAG 1168 -16 P_OUT FLAG -112 352 0 SYMBOL voltage 64 48 R0 SYMATTR InstName V1 SYMATTR Value 9V SYMBOL ind2 384 16 M0 SYMATTR InstName L3 SYMATTR Value 2m SYMATTR Type ind SYMBOL ind2 384 208 M0 WINDOW 0 -46 47 Left 2 WINDOW 3 -59 73 Left 2 SYMATTR InstName L1

SYMATTR Type ind SYMBOL ind2 208 80 R0 SYMATTR InstName L2

SYMATTR Type ind SYMBOL cap 208 240 R0 SYMATTR InstName C1 SYMATTR Value {Ccoup} SYMBOL schottky 432 352 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 -5 13 VBottom 2 SYMATTR InstName D1 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 512 368 R0 SYMATTR InstName C2 SYMATTR Value 100n SYMBOL diode 464 80 M0 WINDOW 0 -33 59 Left 2 WINDOW 3 24 64 Invisible 2 SYMATTR InstName D5 SYMATTR Value RFU01SM4S SYMBOL voltage -256 320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 10 1u 100n 100n 4u 6.6u) SYMBOL res 768 192 M0 SYMATTR InstName R1 SYMATTR Value 16k SYMBOL cap 672 240 M0 SYMATTR InstName C3 SYMATTR Value 100n SYMBOL diode 432 64 M180 WINDOW 0 42 29 Left 2 WINDOW 3 24 0 Invisible 2 SYMATTR InstName D2 SYMATTR Value RFU01SM4S SYMBOL diode 592 0 M0 WINDOW 0 -51 38 Left 2 WINDOW 3 24 64 Invisible 2 SYMATTR InstName D3 SYMATTR Value RFU01SM4S SYMBOL diode 560 144 M180 WINDOW 0 33 -5 Left 2 WINDOW 3 24 0 Invisible 2 SYMATTR InstName D4 SYMATTR Value RFU01SM4S SYMBOL bv 768 384 R0 SYMATTR InstName B1 SYMATTR Value V=(I(V1)*9V) SYMBOL cap 976 400 R0 SYMATTR InstName C4

SYMBOL res 832 384 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 1 SYMBOL bv 736 0 R0 SYMATTR InstName B2 SYMATTR Value V=(I(R1)*V(+HV)) SYMBOL cap 976 16 R0 SYMATTR InstName C5

SYMBOL res 800 0 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value 1 SYMBOL nmos 48 224 R0 WINDOW 0 80 108 Left 2 WINDOW 3 63 148 Left 2 SYMATTR InstName M1 SYMATTR Value Si3474DV_PS_RC SYMATTR Prefix XN SYMBOL cap 1168 400 R0 SYMATTR InstName C6 SYMATTR Value 50n SYMBOL res 1024 384 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL cap 1152 16 R0 SYMATTR InstName C7 SYMATTR Value 50n SYMBOL res 1008 0 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res 16 224 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10 SYMBOL diode -112 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D6 SYMATTR Value 1N4148 SYMBOL Misc\\2N7002 -160 96 R0 SYMATTR InstName U1 TEXT 120 -8 Left 2 !k1 L1 L2 L3 0.95 TEXT 184 464 Left 2 !.tran 5m startup TEXT 64 512 Left 2 !.step dec param Ccoup 10n 317n 2 TEXT 424 -40 Left 2 ;4x RFU01SM4S TEXT -256 544 Invisible 2 !*Oct 07, 2013\n*ECN S13-2104, Rev. A\n*File Name: Si3474DV_PS_RC.txt and Si3474DV_PS_RC.lib\n*This document is intended as a SPICE modeling guideline and does not\n*constitute a commercial product datasheet. Designers should refer to the\n*appropriate datasheet of the same number for guaranteed specification\n*limits.\n* source COMPONENT GENERATOR\n.SUBCKT Si3474DV_PS_RC D G S PARAMS: C2=1000 R1=1M C3=1000 R2=1M C4=1000 R3=1M\n+ C5=1000 R4=1M R5=1M C1=1000\nC_CT6 N11708 N11712

288.3764u TC=0,0 \nC_CF2 0 N16364 8.0837m TC=0,0 \nR_RT1 J-A-TEMP-TANK N11404 8.2782 TC=0,0 \nC_CF7 0 N18737 5.7175m TC=0,0 \nR_RT7 N11712 N11716 11.4483 TC=0,0 \nC_CF4 0 N16388 2.9957 TC=0,0 \nG_G7 0 JUNCTION-TEMPERATURE-1RC VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nX_U1 DRAIN GATE SOURCE SI3474DV \nC_C10 N94536 N94151 {C4} TC=0,0 \nC_C12 N95722 N95798 {C2} TC=0,0 \nC_C5 N92368 N92773 {C2} TC=0,0 \nV_V_Gate G GATE 0VDC\nR_RT3 N11408 N11412 23.2864 TC=0,0 \nC_C8 N94061 N94123 {C2} TC=0,0 \nR_RF3 N16384 N16388 30.4295 TC=0,0 \nV_V4 N11732 0 {TEMP}\nR_R10 N94536 N94151 {R4} TC=0,0 \nR_R5 N92368 N92773 {R2} TC=0,0 \nC_C3 N91434 N91125 {C2} TC=0,0 \nR_R12 N95722 N95798 {R2} TC=0,0 \nR_R8 N94061 N94123 {R2} TC=0,0 \nR_RT8 N11716 N11732 8.4826 TC=0,0 \nR_RT6 N11708 N11712 3.8285 TC=0,0 \nR_R3 N91434 N91125 {R2} TC=0,0 \nG_DissipationPower 0 J-A-TEMP-FILTER VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nC_CT2 N11404 N11408 5.2219m TC=0,0 \nR_RT5 J-F-TEMP-TANK N11708 11.0831 TC=0,0 \nC_C1 JUNCTION-TEMPERATURE-1RC N89014 {C1} TC=0,0 \nC_C13 N95798 N95860 {C3} TC=0,0 \nR_RF2 N16364 N16384 42.2218 TC=0,0 \nV_V3 N11450 0 {TEMP}\nC_C9 N94123 N94536 {C3} TC=0,0 \nR_R13 N95798 N95860 {R3} TC=0,0 \nR_RF8 N18741 N18767 6.3658 TC=0,0 \nC_CT1 J-A-TEMP-TANK N11404 489.5085u TC=0,0 \nR_RF1 J-A-TEMP-FILTER N16364 16.9343 TC=0,0 \nR_RT2 N11404 N11408 30.3634 TC=0,0 \nR_R9 N94123 N94536 {R3} TC=0,0 \nC_CT4 N11412 N11450 1.4549 TC=0,0 \nR_RF5 J-F-TEMP-FILTER N18733 5.3220 TC=0,0 \nV_V5 N16436 0 {TEMP}\nC_CT3 N11408 N11412 44.0232m TC=0,0 \nG_G5 0 J-A-TEMP-TANK VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nC_C4 JUNCTION-TEMPERATURE-3RC N92368 {C1} TC=0,0 \nR_RF7 N18737 N18741 3.8642 TC=0,0 \nC_C14 N95860 N96370 {C4} TC=0,0 \nC_C11 JUNCTION-TEMPERATURE-5RC N95722 {C1} TC=0,0 \nR_RT4 N11412 N11450 47.5096 TC=0,0 \nC_CF8 0 N18741 52.6932m TC=0,0 \nC_C7 JUNCTION-TEMPERATURE-4RC N94061 {C1} TC=0,0 \nR_R1 JUNCTION-TEMPERATURE-1RC N89014 {R1} TC=0,0 \nC_C2 JUNCTION-TEMPERATURE-2RC N91434 {C1} TC=0,0 \nR_R4 JUNCTION-TEMPERATURE-3RC N92368 {R1} TC=0,0 \nR_R14 N95860 N96370 {R4} TC=0,0 \nR_R11 JUNCTION-TEMPERATURE-5RC N95722 {R1} TC=0,0 \nC_CF5 0 J-F-TEMP-FILTER 309.0180u TC=0,0 \nC_CF1 0 J-A-TEMP-FILTER 786.0535u TC=0,0 \nR_R7 JUNCTION-TEMPERATURE-4RC N94061 {R1} TC=0,0 \nR_R2 JUNCTION-TEMPERATURE-2RC N91434 {R1} TC=0,0 \nC_CT5 J-F-TEMP-TANK N11708 28.1584m TC=0,0 \nC_C15 N96370 N95888 {C5} TC=0,0 \nV_V9 N92392 0 {TEMP}\nV_V_Source SOURCE S 0VDC\nV_V11 N95888 0 {TEMP}\nR_RF4 N16388 N16436 20.2980 TC=0,0 \nC_CT8 N11716 N11732 6.9515m TC=0,0 \nV_V10 N94151 0 {TEMP}\nR_R15 N96370 N95888 {R5} TC=0,0 \nG_G4 0 J-F-TEMP-FILTER VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nV_V8 N91125 0 {TEMP}\nC_C6 N92773 N92392 {C3} TC=0,0 \nC_CT7 N11712 N11716 4.2515m TC=0,0 \nG_G9 0 JUNCTION-TEMPERATURE-3RC VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nC_CF6 0 N18733 2.1366m TC=0,0 \nR_R6 N92773 N92392 {R3} TC=0,0 \nG_G11 0 JUNCTION-TEMPERATURE-5RC VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nV_V7 N89014 0 {TEMP}\nC_CF3 0 N16384 906.7409m TC=0,0 \nG_G10 0 JUNCTION-TEMPERATURE-4RC VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nG_G8 0 JUNCTION-TEMPERATURE-2RC VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nR_RF6 N18733 N18737 19.4480 TC=0,0 \nV_V_Drain D DRAIN 0VDC\nG_G6 0 J-F-TEMP-TANK VALUE {\n+ (V(Drain)*I(V_V_Drain)+V(Gate)*I(V_V_Gate)+V(Source)*I(V_V_Source)) }\nV_V6 N18767 0 {TEMP}\n.ENDS\n \n.SUBCKT Si3474DV D G S \nM1 3 GX S S NMOS W= 314470u L= 0.25u \nM2 S GX S D PMOS W= 314470u L= 0.44u\nR1 D 3 8.850e-02 TC=6.133e-03 1.710e-05 \nCGS GX S 1.353e-10 \nCGD GX D 8.132e-12 \nRG G GY 4.3\nRTCV 100 S 1e6 TC=3.555e-04

-3.670e-07 \nETCV GX GY 100 200 1 \nITCV S 100 1u \nVTCV 200 S 1 \nDBD S D DBD 314470u \n**************************************************************** \n.MODEL NMOS NMOS ( LEVEL = 3 TOX = 5e-8 \n+ RS = 0 KP = 7.704e-06 NSUB = 1.439e+17 \n+ KAPPA = 8.000e-02 NFS = 9.997e+11 \n+ LD = 0 IS = 0 TPG = 1 ) \n*************************************************************** \n.MODEL PMOS PMOS ( LEVEL = 3 TOX = 5e-8 \n+NSUB = 1.911e+16 IS = 0 TPG = -1 ) \n**************************************************************** \n.MODEL DBD D ( \n+FC = 0.1 TT = 2.000e-08 T_MEASURED = 25 BV = 101 \n+RS = 4.287e-03 N = 1.295e+00 IS = 2.047e-10 \n+EG = 1.224e+00 XTI =

-1.583e-01 TRS1 = 2.619e-03 \n+CJO = 6.309e-10 VJ = 8.201e+00 M =

6.510e-01 ) \n.ENDS TEXT 824 168 Left 2 ;"Antiseptic" Flyback Converter 9->400V, 10W TEXT 832 208 Left 2 ;Concept by Vladimir Vassilevsky TEXT 832 248 Left 2 ;Details by Phil Hobbs TEXT 832 280 Left 2 ;January 23, 2016

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net