Hey Tim, a unity gain 12 to 330 V DC converter :-)
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From: Jan Panteltje on 14 Jul 2010 12:09 Hey Tim, a unity gain 12 V DC to 330 V DC converter: ftp://panteltje.com/pub/unity_gain_330VDC_generator.gif The blue graph is the value on C4. R5 is there to alow it to start up. Maybe it can be done with one emittor follower with transistors with more beta. C3 R1 and C2 R4 R5 compensate so the round going phase shift is zero. All the 'gain' is from the Q that remains after the loading of L1 C1. Version 4 SHEET 1 880 680 WIRE -464 288 -464 64 WIRE -368 64 -464 64 WIRE -368 272 -368 64 WIRE -368 352 -464 352 WIRE -256 64 -368 64 WIRE -256 208 -256 144 WIRE -256 272 -256 208 WIRE -256 352 -368 352 WIRE -192 208 -256 208 WIRE -192 208 -192 144 WIRE -192 272 -192 208 WIRE -192 432 -192 272 WIRE -128 64 -256 64 WIRE -128 96 -128 64 WIRE -128 208 -128 192 WIRE -128 224 -128 208 WIRE -128 352 -256 352 WIRE -128 352 -128 320 WIRE 0 432 -192 432 WIRE 64 208 -128 208 WIRE 64 208 64 144 WIRE 64 272 64 208 WIRE 128 64 -128 64 WIRE 128 96 128 64 WIRE 128 208 128 192 WIRE 128 224 128 208 WIRE 128 352 -128 352 WIRE 128 352 128 320 WIRE 144 352 128 352 WIRE 144 432 64 432 WIRE 176 352 144 352 WIRE 176 432 144 432 WIRE 192 208 128 208 WIRE 304 208 272 208 WIRE 304 432 240 432 WIRE 304 432 304 208 WIRE 336 64 128 64 WIRE 336 144 336 64 WIRE 336 208 304 208 WIRE 400 208 336 208 WIRE 512 208 480 208 WIRE 624 208 576 208 WIRE 624 288 624 208 WIRE 624 352 176 352 WIRE 688 208 624 208 WIRE 688 272 688 208 WIRE 688 352 624 352 FLAG 176 352 0 SYMBOL npn 64 96 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL pnp 64 320 M180 SYMATTR InstName Q2 SYMATTR Value 2N3906 SYMBOL Misc\\battery -368 256 R0 WINDOW 3 39 54 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 24 78 Left 0 SYMATTR Value 12 SYMATTR SpiceLine Rser=.01 SYMATTR InstName V1 SYMBOL ind 176 224 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 1000� SYMATTR SpiceLine Rser=.01 Cpar=10p SYMBOL cap 320 144 R0 WINDOW 3 37 -31 Left 0 SYMATTR InstName C1 SYMATTR Value 110n SYMBOL res 160 448 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R1 SYMATTR Value 100k SYMBOL cap 64 448 M270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C2 SYMATTR Value 100p SYMBOL cap 240 416 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C3 SYMATTR Value 100p SYMBOL diode 512 224 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value UPSC600 SYMBOL cap 608 288 R0 SYMATTR InstName C4 SYMATTR Value 1� SYMBOL res 672 256 R0 SYMATTR InstName R3 SYMATTR Value 1000k SYMBOL cap -480 288 R0 SYMATTR InstName C5 SYMATTR Value 100� SYMBOL res -272 48 R0 SYMATTR InstName R4 SYMATTR Value 200k SYMBOL res -272 256 R0 SYMATTR InstName R5 SYMATTR Value 200k SYMBOL npn -192 96 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL pnp -192 320 M180 SYMATTR InstName Q4 SYMATTR Value 2N3906 SYMBOL res 496 192 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 5k TEXT -242 506 Left 0 !.tran 0 50m 0 12u startup
From: Tim Williams on 14 Jul 2010 12:59 Ha, a unity gain phase shift oscillator, LC RC RC. Too bad it won't start(?) without R2. That, and the inherent limitation of a Q-limited circuit, limits power output. Q has to be high, of course, since it's just a Q multiplier. Switching current is large, while output voltage is large, which isn't any different from a flyback, though the magnitudes may be a bit different (seeing as the current is sinusoidal, not ramped, which probably means a bit higher RMS current). It is handy that the transistors don't see the output voltage, so they can saturate nicely. What's the switching time? I don't have LTSpice to enter the listing in. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message news:i1knga$f1b$1(a)news.albasani.net... > Hey Tim, a unity gain 12 V DC to 330 V DC converter: > ftp://panteltje.com/pub/unity_gain_330VDC_generator.gif > The blue graph is the value on C4. > R5 is there to alow it to start up. > Maybe it can be done with one emittor follower with transistors with more beta. > C3 R1 and C2 R4 R5 compensate so the round going phase shift is zero. > All the 'gain' is from the Q that remains after the loading of L1 C1.
From: Jan Panteltje on 14 Jul 2010 13:22 On a sunny day (Wed, 14 Jul 2010 11:59:31 -0500) it happened "Tim Williams" <tmoranwms(a)charter.net> wrote in <R1m%n.17421$lS1.16540(a)newsfe12.iad>: >Ha, a unity gain phase shift oscillator, LC RC RC. > >Too bad it won't start(?) without R2. That, and the inherent limitation = >of a Q-limited circuit, limits power output. > >Q has to be high, of course, since it's just a Q multiplier. Switching = >current is large, while output voltage is large, which isn't any = >different from a flyback, though the magnitudes may be a bit different = >(seeing as the current is sinusoidal, not ramped, which probably means a = >bit higher RMS current). It is handy that the transistors don't see the = >output voltage, so they can saturate nicely. > >What's the switching time? I don't have LTSpice to enter the listing = >in. > >Tim This is measured at the emittor Q1 / Q2. The Vce drops show :-) Would be BAD audio :-) ftp://panteltje.com/pub/unity_gain_330VDC_generator_switching_times.gif You should really get LTspice :-) It is windows, I use it in Linux wine windows emulator. >-- >Deep Friar: a very philosophical monk. >Website: http://webpages.charter.net/dawill/tmoranwms > >"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message = >news:i1knga$f1b$1(a)news.albasani.net... >> Hey Tim, a unity gain 12 V DC to 330 V DC converter: >> ftp://panteltje.com/pub/unity_gain_330VDC_generator.gif >> The blue graph is the value on C4. >> R5 is there to alow it to start up. >> Maybe it can be done with one emittor follower with transistors with = >more beta. >> C3 R1 and C2 R4 R5 compensate so the round going phase shift is zero. >> All the 'gain' is from the Q that remains after the loading of L1 C1. > >
From: Jan Panteltje on 14 Jul 2010 13:31 PS I wrote: >This is measured at the emittor Q1 / Q2. >The Vce drops show :-) >Would be BAD audio :-) > ftp://panteltje.com/pub/unity_gain_330VDC_generator_switching_times.gif >You should really get LTspice :-) >It is windows, I use it in Linux wine windows emulator. Maybe you like this spice feature it shows instantaneous power in the transistors: ftp://panteltje.com/pub/unity_gain_330VDC_generator_transistor_power.gif This shows the current in the collector of Q1: ftp://panteltje.com/pub/unity_gain_330VDC_generator_transistor_current.gif I think 2N3904 will die :-) We need something bigger, you are right, switching is more efficient ;-)
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