Why Not ?

--
Hmmm... 

Doesn't quite seem to work. 

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WINDOW 3 23 39 Left 2 
SYMATTR InstName U1 
SYMBOL Opamps\\LT1001 512 144 M0 
WINDOW 0 40 15 Left 2 
WINDOW 3 19 39 Left 2 
SYMATTR InstName U2 
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WINDOW 3 -34 -4 Left 2 
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WINDOW 3 -39 -4 Left 2 
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WINDOW 3 -41 4 Left 2 
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WINDOW 3 32 32 VTop 2 
SYMATTR InstName C2 
SYMATTR Value 10000µ 
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WINDOW 0 -39 32 Left 2 
WINDOW 3 -14 -1 Left 2 
SYMATTR InstName D4 
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WINDOW 0 -51 34 Left 2 
WINDOW 3 -23 0 Left 2 
SYMATTR InstName D5 
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WINDOW 3 -34 -1 Left 2 
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SYMATTR Value 12 
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SYMATTR Value 10000µ 
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SYMATTR InstName C3 
SYMATTR Value 10000µ 
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WINDOW 0 0 32 VBottom 2 
WINDOW 3 32 32 VTop 2 
SYMATTR InstName C4 
SYMATTR Value 10000µ 
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WINDOW 123 0 0 Left 2 
WINDOW 39 0 0 Left 2 
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SYMATTR Value PULSE(0 12 0 1u 1u 500u 1ms) 
SYMBOL voltage -96 464 R0 
WINDOW 3 24 96 Invisible 2 
WINDOW 123 0 0 Left 2 
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SYMATTR InstName V3 
SYMATTR Value PULSE(12 0 0 1u 1u 500u 1ms) 
TEXT -192 624 Left 2 !.tran .02 
TEXT 184 -168 Left 2 ;OUT

There's no reason for it not to work. I fed it from another source as I did n't have the transistors in it yet and it did triple the voltage.

The OPAMP symbols were just used for convenience, they are actuall comp pai rs of high current TO3 transistors, maybe 2N5885 and 5883, I think....

The drive coming in the left is two square waves, one inverted. Consider wh at happens with drive.

In your version (thanks for cleaning that up) when the drive goes high from V2, while V3 is low. V3 drives U5 low which charges C1 via D6. When the dr ive reverses, U5 is driven high whgich dumps the charge from C1 through D5 into C2. When the drive reverses again U4 is driven high and through C2 and D4 feed the output. At this time C1 is picking up a recharge from the 12 v olt line and will be ready for the next cycle.

The exact same thing is happening on the other side with U1 and 2, and C3 a nd 4, but in the opposite phase. This results in the output only having rip ple as long as the switching time of the transistors. This of course eases output filtering requirements, the bigggest caps are in the doubler stack.

It is really just a doubler, but the output is stacked on top of the input which means the output is triple.

I know why many might think it won't work, because they expect to see one m ore diode in each stack and a filter. That would be easy to comprehend, but I found there is no reason to make that intermediate DC. Why ? As long as the diodes conduct when they are supposed to it works.

That means at the junction of D4 and 5, there is a 12 volt peak to peak squ are wave riding on 12 volts DC. This makes 24 volts total which is added to the original 12 volts.

The duty cycle of the drive is strictly 50/50, however I did consider makin g it three phase for more current. In that case there would be three drives and the duty cycle would be one third each. That would require separate in vertors for each phase, and a simple ring counter to develop the waveform. What happened with that idea is that no math I know of could justify the ad ded complexity. It would be easier to just use beefier components in the tw o phases.

So Spice says it won't work or do you ? It does work, perhaps Spice needs i nput of what the drive actually is. Can that be done ? I just put in that i t is square waves ? Right now how the heck would iit know how the choppers are driven ? Of course it doesn't work without drive, which in my old set o f drawings called "Xdrive". Pretty easy to figure why, inverted two phase a nd all, and how the thing works, I thought it was a pretty good name.

I am pretty green on Spice, I am probably going to go take in a couple of t utorials on it. I just got it last month and have been playing with it. I d rew this and everything else that went with it and had every waveform figur ed out and almost every component value. I lost it in a car wreck that I re ally don't want to go into. Just say it was a very bad day.

At this ppoint I think I want even more current out of it. I want to drive a pair of amps using center tapped output chokes. If I get the 36 volts and quadruple it that way, that makes a pretty good amount of power into eight ohms. I know they got car amps out there that are pretty damn good, but al ot of them are rated into four or two ohms, some into one ohm. I want this into eight ohms.

I would have never told all about this if I thought there was a market for it. The market has gone the way it has gone. I want something a bit more au diophile, and the output chokes would give it a nice "sound". You know some McIntosh amps used output chokes like that. This would be for me, and some specail order maybe. It is not destined for Bestbuy to say the least.

Driving audio outputs into the center tapped choke presents its own set of problems but they are not all that hard to solve. One way would be to just use MOSFETs. Another way is to use the proper transformers, and that is eve n better. The only problem with that is it complicates the main negative fe edbak path. I can deal with it.

I actually have output chokes for this. They are actually output transforme rs from tube amps. The main requirement is that they have 4 ansd 16 ohm tap s. They do. Betweeen ground, 4 and 16 is centertapped. I have already built amps for cars using them and their perfomance actually exceeded expectatio ns. Something about those chokes, it's like soft clipping or whatever. The previous versions however only ran off the 12 volt supply. They'd give youi some watts with no DC convertor at all, now I want to add one.

You know another way might be to use PNP aaudio outputs. I'm not sure but I might have four 2N5436s. These babies have 60 mil pins ! The problem is I don't believe they can take the Vce. Running off 36 volts, they will have t o take at least double that. Accounting for a little headroom anything less than 100 Vce is no good. In fact even if I had 5885s and 5883s, they moght be good for the tripler, but not the output. I might look them up.

Doesn't matter, there are plenty of transistors out there. I think at the m oment I'll look for something for the tripler, build the drive circuit for it. That should be a piece of cake, I'll just use a regular BTL amp chip an d set it oscillate at about 6 Khz. I think that a good frequency because ev en slow ass transistors will work fine, and even square enough waves to kee p the ripple way down will cause little or no interference. Note that witho ut transformers in the PS, there is practically no EMI.

I thought it a decent idea. Maybe not the best, but workable.

n't know how to quite use LTSpice yet. The letters are in the way, but real ly it is still readable.

r amp.

hy not this ? You know when a capacitor is a filter is still charges and di scharges just the same, the only fdifference here is like with a coupling c ap, it is floating.

is no regulation at all, and none needed. It is simple brute force. It puts out triple what is applied. At the bottom it is fed the usual 12 volts fro m the battery. Then 24 volts is developed. (actually in the original design , if the input voltage went above about 16 volts the drive to the outputs w ould switch to in phase and it would only double the voltage)

ered making them easily replacable if this circuit is used. Actually I have built it partly, using good CGS caps of like 15,000 uF and 1N6095 diodes. I intended to use I think 2N5883 and 5885 transitors, low voltage units wit h alot of current capacity. Everything to minimize voltage loss. In an audi o amp, every volt is important because of the watts you lose.

pply, should have been maybe fifty watts into eight ohms but really, if tho se are really good capacitors it would have no problems with lower impedanc es. Also, with 18 volts on the speaker leads I came up with a pretty dandy amp protection circuit usiing an SCR and some hefty rectifiers to clamp it all down. In "short", if you connected a speaker wire to the car battery it would burn the wire off and not be damaged. The protection would be reset simply by turning the power switch to off, from either on or auto.

d. It was all hand drawn and in a notebook and got lost in a car wreck many many years ago. (I was changing the station and grabbing a beer at the sam e time I think, no more of that shit....)I know that since then many car am ps have come out with better performance etc., but this is one of those jus t for the hell of it things.

it to use but build the new features in as time passed. I would have left room in the unit for other boards. "Other" boards would include a tone cont rol circuit. The bass I remember, 18 dB range, with the turnover variable f rom 48 to 440 HZ. that's just how the numbers worked out actually and it wa s a totally unheard of circuit. It consisted of an actual crossover and the bass control was simply a level control, like a partial bi-amping in a way . Treble was handled similarly. Low and high mid controls were not parametr ic and had less range. I saw 18 dB as a bit too much for them. At the time.

mers you want but somewhere there is still a cap charging and discharging i f you want to kick up the voltage. I just eliminated the transformer. Think about the advantages in the circuit really, no freewheelers, no dampers, s nubbers, any of that. All gone. Use any frequency you want, I was thinking like 6Khz. Why not ? No measures needed to switch transistors faster, drive optimization, nothing.

one inverse the other, it would damnear put out DC already without any addi tional filtering. Even more, who needs high frequency given this ?

ink is all that great....), but it lacks certain problems involved in the d esign of a transformer based supply.

DV/DT problems or anything of the sort, in fact the power supply part, bec ause of that, was submersible. It's not like all the impedances were zero, but the bases and emitters were tied together. No bias was needed of course . The thing was designed to be F_____g indestructible.

try something like 6V on the inverting input of the opamps then you might get a square wave on the outputs ;)

and reduce the capacitor sizes

-Lasse

--
As it's drawn, we both do.

On Wed, 09 Oct 2013 01:32:19 -0500, John Fields wrote:

--- Version 4 SHEET 1 2108 872 WIRE 736 -160 736 -192 WIRE 1488 -160 1488 -192 WIRE 640 -144 608 -144 WIRE 688 -144 640 -144 WIRE 1584 -144 1536 -144 WIRE 1616 -144 1584 -144 WIRE 736 0 736 -64 WIRE 784 0 736 0 WIRE 896 0 848 0 WIRE 944 0 896 0 WIRE 1072 0 1008 0 WIRE 1152 0 1072 0 WIRE 1216 0 1152 0 WIRE 1328 0 1280 0 WIRE 1376 0 1328 0 WIRE 1488 0 1488 -64 WIRE 1488 0 1440 0 WIRE 1072 32 1072 0 WIRE 1152 32 1152 0 WIRE 736 48 736 0 WIRE 1488 48 1488 0 WIRE 640 128 640 -144 WIRE 688 128 640 128 WIRE 1072 128 1072 96 WIRE 1152 128 1152 112 WIRE 1584 128 1584 -144 WIRE 1584 128 1536 128 WIRE 736 176 736 144 WIRE 1488 176 1488 144 WIRE 896 192 896 0 WIRE 1328 192 1328 0 WIRE 112 240 112 208 WIRE 336 240 336 208 WIRE 736 304 736 272 WIRE 1488 304 1488 272 WIRE 640 320 608 320 WIRE 688 320 640 320 WIRE 1584 320 1536 320 WIRE 1616 320 1584 320 WIRE 112 352 112 320 WIRE 144 352 112 352 WIRE 336 352 336 320 WIRE 368 352 336 352 WIRE 336 384 336 352 WIRE 112 432 112 352 WIRE 160 432 112 432 WIRE 272 432 240 432 WIRE 112 464 112 432 WIRE 736 464 736 400 WIRE 784 464 736 464 WIRE 896 464 896 256 WIRE 896 464 848 464 WIRE 1328 464 1328 256 WIRE 1376 464 1328 464 WIRE 1488 464 1488 400 WIRE 1488 464 1440 464 WIRE -64 512 -112 512 WIRE 48 512 16 512 WIRE 736 512 736 464 WIRE 896 512 896 464 WIRE 1328 512 1328 464 WIRE 1488 512 1488 464 WIRE -224 544 -224 496 WIRE -112 544 -112 512 WIRE 640 592 640 320 WIRE 688 592 640 592 WIRE 896 592 896 576 WIRE 1328 592 1328 576 WIRE 1584 592 1584 320 WIRE 1584 592 1536 592 WIRE -224 656 -224 624 WIRE -112 656 -112 624 WIRE -112 656 -224 656 WIRE 112 656 112 560 WIRE 112 656 -112 656 WIRE 336 656 336 480 WIRE 336 656 112 656 WIRE 736 656 736 608 WIRE 736 656 336 656 WIRE 1488 656 1488 608 WIRE 1488 656 736 656 WIRE -224 720 -224 656 FLAG 736 272 +12 FLAG 112 208 +12 FLAG -224 720 0 FLAG -224 496 +12 FLAG 336 208 +12 FLAG 144 352 PHI1 FLAG 368 352 PHI2 FLAG 608 -144 PHI1 FLAG 736 176 0 FLAG 736 -192 +12 FLAG 608 320 PHI2 FLAG 896 592 +12 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R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL res 320 224 R0 WINDOW 0 -46 46 Left 2 WINDOW 3 -64 75 Left 2 SYMATTR InstName R1 SYMATTR Value 1000 SYMBOL res 256 416 R90 WINDOW 0 -10 53 VBottom 2 WINDOW 3 40 55 VTop 2 SYMATTR InstName R3 SYMATTR Value 20k SYMBOL pmos 688 -64 M180 SYMATTR InstName M3 SYMATTR Value IRF7406 SYMBOL nmos 688 48 R0 SYMATTR InstName M4 SYMATTR Value IRF7403 SYMBOL cap 848 -16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 1000µ SYMBOL cap 848 448 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 1000µ SYMBOL schottky 912 256 R180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D2 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 944 16 R270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D3 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL res 1136 16 R0 SYMATTR InstName R5 SYMATTR Value 8 SYMBOL pmos 1536 400 R180 SYMATTR InstName M5 SYMATTR Value IRF7406 SYMBOL nmos 1536 512 M0 SYMATTR InstName M6 SYMATTR Value IRF7403 SYMBOL schottky 1312 576 M180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D4 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL pmos 1536 -64 R180 SYMATTR InstName M7 SYMATTR Value IRF7406 SYMBOL nmos 1536 48 M0 SYMATTR InstName M8 SYMATTR Value IRF7403 SYMBOL cap 1376 -16 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 1000µ SYMBOL cap 1376 448 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 1000µ SYMBOL schottky 1312 256 M180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D5 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 1280 16 M270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D6 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 1056 32 R0 WINDOW 0 -34 32 Left 2 WINDOW 3 -63 63 Left 2 SYMATTR InstName C1 SYMATTR Value 1000µ TEXT -216 688 Left 2 !.tran .005 TEXT -96 688 Left 2 ;Dual complementary-phased Dickson tripler TEXT -96 720 Left 2 ;John Fields, 08 October 2013

It takes a little while to simulate, so be patient. :-)

PS: The circuit needs D3, D6, and C1 in order for the output to the load to climb to past 24V.

-- JF

--
Yup! :-)

Thanks all.

I intended on square waves all along. I think this was just not drawn right on my part after seeing the exmples. I should have just did it on paper an d scanned it....

So it is a Dickerson eh ? When did that come out ? I "invented" it a damn l ong time ago, I mean I was half my age or less I think. I'm betting that it was patented the day before I came up with it lol.

Either way, to get alot more current out of it I will probably need banks o f caps. Originally I bought these CGS grade Mallorys or whatever for their low ESR. Getting that low ESR in a 1,000uF is not going to be easy.

Also, there is no need for any type of matching of the choppers, in fact on e could be bipolar and the other MOSFET in a pair if I can conjure up a way to simplify the drive circuit. Who knows maybe I can eliminate the inverte rs altogether. Maybe I can even make the thing self oscillate if I have hig h enough gain devices to keep them saturated.

That can all be worked on, the worst part of this is getting caps that will give me ridiculous current for the choke type amp. This power supply is go ing to suffer under that load and I don't need it to lose its smoke. I migh t have to use one per channel.

that is why I originally considered a three phase version. I just couldn't get it com;letely figured out. It doesn't seem right to use the 33%/66% dut y cycle because it doesn't do shit for efficiency. It's just another circui t. I could as easily (almost) just make one supply for each channel. It wou ld only be 25 % more than trying to work out all the problems of the three phase deal.

How could that work ? It would be 33 % high for the top choppers which mean s 66 % low. During that time the top cap would have more time to charge, bu t the bottom cap could not be there to charge it, or could it ?

Thst would mean to push "negative" voltage into the bottom (the 12 volt) at 33 % of the time. That means what, I would have to use the Q and notQs fro m the ring counter ? Shit, this is headache territory. For a few dollars mo re, I just go with dual power supplies. It also looks better on paper. It m ight even sound betrer. Hell, it also gives the option of building them in monoblocks.

The audiophiles would bust a nut over them.

Yup, if I go with all this, each channel will have its own tripler. It solv es too many problems at once.

I'm starting to think outloud here. Time for bed, or maybe prune juice or s ome shit. When I think about how long ago I started this, and how far back that burner is it got stuck on, I feel old.

Mourn me, it will be valid soon lol.

I am going to build this shit, but I cannot see, I cannot pee, I cannot sme ll, I look like hell........

What's more, I don't even like to drive. No shit, too many assholes out the re. I don't even play the radio when I drive. I'll hook up a car alernator to a bicycle and set it up like an exercise bike. Take a battery, the amp. then get some good speakers for it.

Then feed it from a PC because I don't even use disks anymore.

Almost doesn't seem worth it.

LET'S DO IT !

--
"Dickson."

ht on my part after seeing the exmples. I should have just did it on paper and scanned it....

ong time ago, I mean I was half my age or less I think. I'm betting that it was patented the day before I came up with it lol.

John Fields cites a paper from 1976. That's 37 years ago - you might be 74, but it's unlikely.

People do seem to get original ideas at much the same time. A friend of min e invented a better confocal microscope - and made quite a bit of money out of the patent, which he wouldn't have done if Tektronix hadn't dropped a v ery similar provisional patent dated three weeks before his patent applicat ion.

Sometimes you can work out what the common trigger was. Back in November 19

86 I sent a memo to my boss suggesting that we might patent a particular wa y of stabilising a GaAs single-crystal puller. In March 1987 the inventor o f the then standard way of pulling GaAs singel crystals showed up with his own - more or less identical - patent application, dating from rather earli er in 1986.

My insight had come from reading a paper in the journal where the inventor was not only an editor but also the action editor for that particular paper .

--
Bill Sloman, Sydney

maybe use a H-bridge IC.

--
?? 100% natural 

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

You mean like a BTL driver Same thing ?

Sure could, except that out of this i want some current. The one model out here uses surface mounts, I assure you that will not work, my current load will be way too much.

In the simplsst terms, with the output choke feeding an eight ohm load, it is going to swing +36 on one side of the speaker and as close as possible to -36 on the other side. Just one channel is effecrtively working into two ohms.

Basically 72 V peak times RMS is 50.9, times itself is 2591 andabit. Divided by eight is 323 watts. That is the power at clipping, true power is less.

But still, it pulls a shitload of current.

I know of some nice 65 amp FETs used in plasma TVs that are nice and cheap. For a stupid invertor transistor and cap, I can drive it. In facrt I can drive anything.

These types of circuits are mainly used to generate high voltages at low cu rrent levels. If you try to power a serious audio amp this way you will fin d that it is very inefficient. Let's assume that you audio amp needs to supply 10 amps rms. Due to the vol tage tripling, the input rms current will be at least 30 amps rms. But the problem is that all this current is consumed in narrow transients when the switching occurs, so you might be looking at peak currents of well over 100 amps. Even if you find devices that can handle this, the ON resistance get s magnified at the output so your overall efficiency will be very poor.

Bob

Isn't that true of any other converter anyway ?

OK, not really a flyback type, but that wouldn't be suited to this app anyway......

No, once you decide against storing energy in an inductor and instead only use capacitors, your efficiency when delivering large output currents drops dramatically. If there were such a thing as an ideal switch then it would be different.

Bob

No, once you decide against storing energy in an inductor and instead only use capacitors, your efficiency when delivering large output currents drops dramatically. If there were such a thing as an ideal switch then it would be different.

Bob

On Wed, 9 Oct 2013 01:58:27 -0700 (PDT), snipped-for-privacy@gmail.com wrote:

--- Panasonic has a nice line of low - ESR, high-current electrolytics which might work in your application:

BTW, I hammered on that Dickson tripler some more and came up with:

Version 4 SHEET 1 2108 1636 WIRE 800 -160 800 -192 WIRE 1552 -160 1552 -192 WIRE 752 -144 720 -144 WIRE 1648 -144 1600 -144 WIRE 16 -112 -48 -112 WIRE -48 -64 -48 -112 WIRE 16 -48 16 -112 WIRE 16 -48 0 -48 WIRE 32 -48 16 -48 WIRE 80 -48 32 -48 WIRE 800 0 800 -64 WIRE 848 0 800 0 WIRE 960 0 912 0 WIRE 1008 0 960 0 WIRE 1136 0 1072 0 WIRE 1216 0 1136 0 WIRE 1280 0 1216 0 WIRE 1392 0 1344 0 WIRE 1440 0 1392 0 WIRE 1552 0 1552 -64 WIRE 1552 0 1504 0 WIRE 1216 32 1216 0 WIRE 800 48 800 0 WIRE 1136 48 1136 0 WIRE 1552 48 1552 0 WIRE -48 64 -48 32 WIRE 32 64 32 -48 WIRE 32 64 -48 64 WIRE 752 128 720 128 WIRE 1648 128 1600 128 WIRE 1136 144 1136 112 WIRE 1216 144 1216 112 WIRE 800 176 800 144 WIRE 1552 176 1552 144 WIRE 960 192 960 0 WIRE 1392 192 1392 0 WIRE 800 304 800 272 WIRE 1552 304 1552 272 WIRE 752 320 720 320 WIRE 1648 320 1600 320 WIRE 960 384 960 256 WIRE 1008 384 960 384 WIRE 1136 384 1072 384 WIRE 1168 384 1168 352 WIRE 1168 384 1136 384 WIRE 1280 384 1168 384 WIRE 1392 384 1392 256 WIRE 1392 384 1344 384 WIRE 240 416 240 384 WIRE 1136 432 1136 384 WIRE 800 464 800 400 WIRE 848 464 800 464 WIRE 960 464 960 384 WIRE 960 464 912 464 WIRE 1392 464 1392 384 WIRE 1440 464 1392 464 WIRE 1552 464 1552 400 WIRE 1552 464 1504 464 WIRE -112 512 -112 448 WIRE 800 512 800 464 WIRE 960 512 960 464 WIRE 1392 512 1392 464 WIRE 1552 512 1552 464 WIRE 32 528 -64 528 WIRE 144 528 32 528 WIRE 240 528 240 496 WIRE 240 528 144 528 WIRE 1136 528 1136 496 WIRE 32 560 32 528 WIRE 240 560 240 528 WIRE 144 576 144 528 WIRE 752 592 720 592 WIRE 960 592 960 576 WIRE 1392 592 1392 576 WIRE 1648 592 1600 592 WIRE -112 672 -112 608 WIRE -80 672 -112 672 WIRE 32 672 32 624 WIRE 32 672 0 672 WIRE 144 672 144 640 WIRE 240 672 240 640 WIRE -112 752 -112 672 WIRE 32 752 32 672 WIRE 352 752 352 720 WIRE 464 752 464 720 WIRE 576 752 576 720 WIRE 688 752 688 720 WIRE -112 896 -112 832 WIRE 32 896 32 816 WIRE 32 896 -112 896 WIRE 352 896 352 832 WIRE 352 896 32 896 WIRE 464 896 464 832 WIRE 464 896 352 896 WIRE 576 896 576 832 WIRE 576 896 464 896 WIRE 688 896 688 832 WIRE 688 896 576 896 WIRE 800 896 800 608 WIRE 800 896 688 896 WIRE 1552 896 1552 608 WIRE 1552 896 800 896 WIRE -112 992 -112 896 FLAG 800 272 +12 FLAG 800 176 0 FLAG 800 -192 +12 FLAG 960 592 +12 FLAG 1216 144 0 FLAG 1552 272 +12 FLAG 1552 176 0 FLAG 1552 -192 +12 FLAG 1392 592 +12 FLAG -112 992 0 FLAG -112 448 +12 FLAG 352 720 PH1a FLAG 464 720 PH1b FLAG 576 720 PH2a FLAG 688 720 PH2b FLAG 1136 144 0 FLAG 720 -144 PH1a FLAG 720 128 PH1b FLAG 720 320 PH2a FLAG 720 592 PH2b FLAG 1648 -144 PH2a FLAG 1648 128 PH2b FLAG 1648 320 PH1a FLAG 1648 592 PH1b FLAG 1168 352 BOOST FLAG 240 384 BOOST FLAG 240 672 0 FLAG 144 672 0 FLAG 1136 528 0 FLAG 80 -48 0 SYMBOL pmos 752 400 M180 SYMATTR InstName M3 SYMATTR Value IRF7406 SYMBOL nmos 752 512 R0 SYMATTR InstName M4 SYMATTR Value IRF7403 SYMBOL schottky 976 576 R180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D2 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL pmos 752 -64 M180 SYMATTR InstName M1 SYMATTR Value IRF7406 SYMBOL nmos 752 48 R0 SYMATTR InstName M2 SYMATTR Value IRF7403 SYMBOL schottky 976 256 R180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D1 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 1008 16 R270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D3 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL res 1200 16 R0 SYMATTR InstName R1 SYMATTR Value 8 SYMBOL pmos 1600 400 R180 SYMATTR InstName M7 SYMATTR Value IRF7406 SYMBOL nmos 1600 512 M0 SYMATTR InstName M8 SYMATTR Value IRF7403 SYMBOL schottky 1376 576 M180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D6 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL pmos 1600 -64 R180 SYMATTR InstName M5 SYMATTR Value IRF7406 SYMBOL nmos 1600 48 M0 SYMATTR InstName M6 SYMATTR Value IRF7403 SYMBOL schottky 1376 256 M180 WINDOW 0 -35 33 Left 2 WINDOW 3 -152 0 Left 2 SYMATTR InstName D5 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 1344 16 M270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D4 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage 576 736 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(15 -15 10u 100n 100n 50u 120u) SYMATTR InstName V2a SYMBOL voltage 352 736 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(15 -15 70u 100n 100n 50u 120u) SYMATTR InstName V1a SYMBOL voltage 688 736 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(-15 15 70u 100n 100n 50u 120u) SYMATTR InstName V2b SYMBOL voltage 464 736 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(-15 15 10u 100n 100n 50u 120u) SYMATTR InstName V1b SYMBOL polcap 912 -16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 1000µ SYMBOL polcap 912 448 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 1000µ SYMBOL polcap 1440 -16 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 1000µ SYMBOL polcap 1440 448 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 1000µ SYMBOL polcap 1152 48 M0 SYMATTR InstName C5 SYMATTR Value 1000µ SYMBOL voltage -112 736 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(0 12) SYMATTR InstName V1 SYMBOL nmos -64 608 R180 SYMATTR InstName M9 SYMATTR Value FDMS3622SQ2 SYMBOL cap 48 816 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C6 SYMATTR Value 1µ SYMBOL res 16 656 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL schottky 1008 400 R270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D7 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 1344 400 M270 WINDOW 0 74 31 VTop 2 WINDOW 3 69 37 VBottom 2 SYMATTR InstName D8 SYMATTR Value MBRB2545CT SYMATTR Description Diode SYMATTR Type diode SYMBOL diode 48 624 R180 WINDOW 0 -41 31 Left 2 WINDOW 3 -70 66 Left 2 SYMATTR InstName D9 SYMATTR Value 1N4148 SYMBOL res 224 400 R0 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL res 224 544 R0 SYMATTR InstName R5 SYMATTR Value 50K SYMBOL polcap 1152 432 M0 SYMATTR InstName C7 SYMATTR Value 10µ SYMBOL nmos 0 32 R180 SYMATTR InstName M10 SYMATTR Value FDR4420A SYMBOL polcap 160 576 M0 WINDOW 0 -38 34 Left 2 WINDOW 3 -19 61 Left 2 SYMATTR InstName C8 SYMATTR Value 1µ TEXT -96 928 Left 2 !.tran .1 startup TEXT 96 928 Left 2 ;Push-push Dickson tripler TEXT 96 952 Left 2 ;John Fields, 13 October 2013 TEXT 312 160 Left 6 ;OK

Needs more work, but adequate to prove a point...

-- JF

What is the purpose of the "boost" ?

--- M9 is an N channel source follower, and "BOOST" is a voltage generated by the doubler which is higher than the source voltage (but less than Vgs(max)) and is used to drive M9's channel as close to saturation as possible, thereby reducing M9's dissipation after startup.

-- JF