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Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
^^ , so the same 12 volt battery that could supply 200 amps is now a 2400 watt battery ?? ,
batterys arent messured in watts , they are messure in amp hours , as a battery could supply 12 Volts at 10 A , 50 A or 200 A . The " watts " your are pulling may change , but the Ah capcity of the battery will remain the same .
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I can squeeze a 600 watts of continious torture for about 5 mins with out failure? Yes? Excellent
Twirly. Thanks for the explanation :o :P. Anyway the insanity of the internet told me that 15 kh is near the maximum. And that they like from 100s of herts to thousands. But tho i am running them at thier high freq range Again :P Anyone who has a zvs driver and a ignition coil handy please do me a little test and post a video on youtube :P I don't have a ignition coil handy :(
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Iggy=ignition coil.
A quick calculation suggests ~500Hz for a V8 ignition coil. The core will limit the frequency, and stray capacitance/leakage inductance may also do the same. It will operate at higher frequencies, but it won't be efficient. As I previously stated, iggy's are designed to run in flyback mode, not push-pull.
Removing the core, as per the link I posted, will allow you to run it at higher frequencies. You will also be able to push more power through it because the core won't saturate. With no core the coupling will be looser, though, although, as the link states, it's possible to get 250kV out of it (and Terry Fritz knows what he's talking about, he's very well respected on these forums).
Personally I think, if you want big arcs without spending money, you should get a few flyback cores, put them side by side, and wind your own primary and secondary coils around them. The power you can put through a cored transformer depends on the cross-sectional area of the core.
I certainly don't have all the answers, but I am in the process of researching and designing my own HV transformer.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I am okay with spending some 50 dollars on the transformer that i will drive. And the 250 kv is cool and all. And i try to respect all members here really. But the 250 kv won't have a single mili amp of current :( Tho i always liked the idea of having a crazy high voltage that can produce some bizzare xrays and stuff but i need current. Some 100 mili amp ++++ Also instead of ufs. i would need to operate in maybe a thousand pf? Home made capacitors easily break a thousand pf And again. A home made transformer is the last of the last of the goddamn last choices. The classic cores i find in my flybacks have a tiny winding window.. With proper insulation i can fit 500 turns. which is not impressive. Anyway. So the core limits the freq. I can make the frequency lower by adding more capacitor. Problem solved. The dude who ran a iggy with zvs said he used 8 to 10 uf. Still if anyone has a zvs and a iggy handy please try :D
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Arcingnoob wrote ...
I am okay with spending some 50 dollars on the transformer that i will drive. And the 250 kv is cool and all. And i try to respect all members here really. But the 250 kv won't have a single mili amp of current :(
I didn't mean to imply you didn't respect him, I meant he has a lot more respect than people like me
Arcingnoob wrote ...
Tho i always liked the idea of having a crazy high voltage that can produce some bizzare xrays and stuff but i need current. Some 100 mili amp ++++
If you put three or four flyback cores together, you can push three or four times as many volts per turn, so 500 turns 'could' give 5-10kV (I think, if you push the Bmax), it will also give a lot of current (5kv@100mA is 500Watts, I think you could push at least 1000W through something like this, maybe more if you push it.)
Hopefully someone else will comment here, but I don't think I'm that far off the mark here.
As I said before, I'm still learning this stuff too.
If you decide to try this, remember it will be LETHAL if you have a mishap, so follow ALL the safety rules.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I need some 10kv plus. and more than a 100 ma. Your idea seem interesting. But for now. I will use cores that aren't broken. I have 2 . So 2 to go. Which i will gain through the history of destroying flybacks. And again. If anyone has a iggy handy. Try the crazy idea :P
And thanks alot ashsmall :D
If i use 4 cores. What happens if i wind 5+5 4 times. And parallel them all. And each one of the four draws the usual 10 to 13 amps. If i parallel 4 primaries. each draws 10 that means 40 amps. At 50 volts. For those 50 volts i will use 10 atx power supplies. With thier ultra high current 5 volt regulated rails. And i might get really high curent output :P Maybe the current drawn will divide evenly among them. Like in a bifilar winding. But with 4 different windings.
And if you open the core of a flyback. And remove airgaps. Then i can open the core of a iggy and remove the air gap
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Arcingnoob wrote ...
I need some 10kv plus. and more than a 100 ma. Your idea seem interesting. But for now. I will use cores that aren't broken. I have 2 . So 2 to go. Which i will gain through the history of destroying flybacks. And again. If anyone has a iggy handy. Try the crazy idea :P
And thanks alot ashsmall :D
If i use 4 cores. What happens if i wind 5+5 4 times. And parallel them all. And each one of the four draws the usual 10 to 13 amps. If i parallel 4 primaries. each draws 10 that means 40 amps. At 50 volts. For those 50 volts i will use 10 atx power supplies. With thier ultra high current 5 volt regulated rails. And i might get really high curent output :P Maybe the current drawn will divide evenly among them. Like in a bifilar winding. But with 4 different windings.
And if you open the core of a flyback. And remove airgaps. Then i can open the core of a iggy and remove the air gap
Why not just wind one 2+2 or 3+3 primary around all four flybacks?
I think Iggy's (the can type) just have a round bar as a core, but I've never taken one apart. I don't know whether the laminated core types have airgaps or not. I don't have one to hand, but I have one (GM) that I can pick up in a few weeks, when I get my lathe.
In all the old coils Ive found laminates , I think moderns have ferrite dont know for sure pri and sec are connected , theres + and - and HV op lead connected to the core/laminates. Ive wondered about nissan sky line coils = 1 on each sparkplug, they might be ferrite
Ive only found 1 that is short enough to fit on a FBT core , Im working myself up to soldering leads and stuff for a little some thing. at least I know theres no diodes in there but its paper insulation usually soaked in oil.
pri with yellow tape is on card board . to remove from can just pry back lip on top of can , its aluminium.
Registered Member #1038
Joined: Mon Oct 01 2007, 08:02PM
Location:
Posts: 96
I actually uploaded that video, I had to add a lot of capacitance to bring the frequency low enough for it to work. In hindsight I probably should have worked on optimizing the turns ratio on the flyback core. But I was only doing it to see if it would work at all. I think I had 6uF on it or so.
If I recall right, the coil was getting slightly warm, but the main problem was the corona discharge burning /everything/ as seen in the video. Went though liquid electrical tape like it wasn't even there.
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Zvs driven ignition coil.
