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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Short question, somewhat longer answer There are many types of flybacks and all will usually provide different voltages before they break down.
Old bare-wire flyback from color TV, no multiplier:These are very rare, could be good up to ~40kV (flybacks that were used with multiplier usually cannot go past ~20kV)
Old bare-wire flyback from B/W TV: 20-40kV maybe, depends largely on transformer construction.
Modern diode-split transformers can often produce quite respectable voltages when driven properly. Most will easily go past 50kV, some units will go over ~70kV! I had one make an arc start at 14cm, the static electricity is everywhere, you can hear hiss/crackle on things all around the transformer, strong corona wind blows off the HV terminal, you can feel your hair rise and light things (even a plastic ruler) will stick on the bottom of the table!
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Its on this site, it is of some member here: (2nd schem.) Edit: I found it, it is Jovica's site. Remove the 25ohm gate resistor. The schematic design is mine, not his (at least the output stage), and the flybacks photo is also mine. At least he could have given some credits.
Here is my orig schematic It will also work with single IRFP250. 35V is absolute maximum for power supply, 30-32V is safe.
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
The site that Jan gave you the link to is mine =P
im sorry for not giving you any credit, but i was kind of rushing it and was not really sure who to give credit to as i wasnt sure if it was your design or someone else's, I was going to send you a pm about this but never got around it, iv been very busy these days with assignments and whatnot.
anyways when i get enough time to edit the page ill give you credit and anyone else if i forgot.Very sorry if i have offended you Jan.
As for voltage Hmm as it says on the site you can go past 100kv with a good flyback.
What is Quasi-resonant, well from what i have understood its a capacitor thats helps the flyback operate at a frequency just below the fres of transformer
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Dr. Arc wrote ...
The site that Jan gave you the link to is mine =P
im sorry for not giving you any credit, but i was kind of rushing it and was not really sure who to give credit to as i wasnt sure if it was your design or someone else's, I was going to send you a pm about this but never got around it, iv been very busy these days with assignments and whatnot.
anyways when i get enough time to edit the page ill give you credit and anyone else if i forgot.Very sorry if i have offended you Jan.
As for voltage Hmm as it says on the site you can go past 100kv with a good flyback.
What is Quasi-resonant, well from what i have understood its a capacitor thats helps the flyback operate at a frequency just below the fres of transformer
It is OK as long as you give me some credit on your site.
The voltage is not probably 100kv, the arcs start at 10cm but thats most likely a lot less, 50-70 maybe. The reason is that higher voltages can jump further, because of corona breakdown.
I'm not exactly sure if the term quasi-resonant is correct, anyway it means that the primary circuit resonates in only one halfwave, then gets reset by the switch (transistor) so the resonance is not continuous.
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flyback
