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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
I would suggest building a high-frequency isolation transformer that would have windings to drive the primary of each flyback. You would need a fairly large ferrite, but it should allow you to design it to handle 300kVDC between windings (must be in oil!).
I think, though, that there are easier ways to get 300kV, primarily using a C-W stack.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
You can build low Khz optoisolators with several megavolt isolation cheaply by using phototransistors (with visible light filter) and IR 'power' leds, all aimed at the ceiling or at a large metal plate
Run all stages with one 'sender'. Might lose a bit of sync between stages, as brightness levels/thresholds vary between stages...but who cares - it's already totally nuts anyway
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Running the whole stuff from a battery should avoid the attraction of the very HV of the upper secondaries to the primaries, because the primaries are not grounded.
I would like to point out that ground is not a magical point that all electricity would like to jump to it is just a common point that is used frequently. Running from a battery will isolate your flybacks from all other conductive paths (like ground) but it doesn't get rid of arcover issues, the voltage potential from primary to secondary is exactly the same in a grounded system as it is in an ungrounded system.
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
maybe hook up all transformers up in series, but with the earthiest lead of the secondary shorted to the core and the primary center tapped to the core... and center-tap the middle winding of the whole stack to earth ground. i like the opticoupouler idea. you could probably modulate laser diodes and point them all at a separate photo transistor for each flyback... that would technically reduce the NEED for oil, but i would submerge it anyway. but if you can't attach leads to the ferrite core, forget it. isolation would be needed, preferably rated for the full 200kv if from the line. good luck
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Ok guys, the solution seems to be completely undoable for me; driving each fly-back from a separate battery and turning it on by laser...
However, I have another idea for the use of my fly-back collection and again any comments on this would be highly appreciated. The biggest problem for me when I wanted to built a CW was to get the HV diodes. What about to use the fly-back secondaries as HV diodes in CW stack. I have quite strong (min100W) 6Khz AC 50KV source made of an ignition coil and also collection of very robust 60KV (4,5nF) capacitors
So do you thing that CW made of these components is worth to try?
I'm not sure he used them in series, but I doubt that he was getting 100kV, Certainly his results don't show much difference between 50, 75 and 100kV. He was only using one driver. I don't believe the 100kV. I have 40 identical flybacks. It would be nice to make a 1MV flyback supply. The only way that might work is with a cascade of big ferrite isolating transformers under oil. Hey, I have a lot of them and a lot of oil and a lot of wire. Shame I don't have the time. Maybe I'll make a proof of concept version to run 2 flybacks. Simpler and faster is just multiple individual supplies run by separate SLA batteries with switching by a nylon line. Phasing doesn't matter with separate drivers for a DC output.
I'm not sure he used them in series, but I doubt that he was getting 100kV, Certainly his results don't show much difference between 50, 75 and 100kV. He was only using one driver. I don't believe the 100kV. I have 40 identical flybacks. It would be nice to make a 1MV flyback supply. The only way that might work is with a cascade of big ferrite isolating transformers under oil. Hey, I have a lot of them and a lot of oil and a lot of wire. Shame I don't have the time. Maybe I'll make a proof of concept version to run 2 flybacks. Simpler and faster is just multiple individual supplies run by separate SLA batteries with switching by a nylon line. Phasing doesn't matter with separate drivers for a DC output.
TDU
That would work but you can use 2 flybacks in series without anything special, just by soldering both HV gnd pins together and connecting them to mains gnd
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300KV from fly-backs?
