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Registered Member #3761
Joined: Tue Mar 15 2011, 12:29AM
Location: Toronto, Canada
Posts: 15
I know that the 4HV forum knows how to reduce corona discharge but for my project I need to do the exact opposite and create as much as possible. Currently I'm proposing using a ignition coil attached to 2 pieces of mesh on each side of a ceramic dielectric, using anything other than a ig coil is out of the question. I'm trying to figure out the most effective way to create corona, I've heard AC is better for coronas than DC (I'm guessing a ignition coil outputs AC because of the frequency generator but i may be wrong)? Is it optimal to use the thickest dielectric possible or even using just a air gap between the mesh. Any tips? I'm having a hard time researching anything as it mostly leads to grow op forums (I don't trust them)
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
DC is not very good at putting a lot of energy into corona ... you need too much space. Here is one option for making a corona generator with a pulsed HV source, although if you're messing with ignition coil it's probably a little too high grasped :
Also while it's not technically corona, Dielectric Barrier Discharge (just google it) has similar characteristics. Unlike the above paper it can work with plain HF AC rather than needing ultra-short pulses ... it's comparatively easy to build.
Of course Tesla coils can also produce corona quite spectacularly if you put a nail on top, not very practical though.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Get two pieces of aluminum screen and put them on opposite sides of a glass panel. Attach them to a 15kV NST and you now have a huge ozone generator (if that's what you wanted).
Registered Member #3761
Joined: Tue Mar 15 2011, 12:29AM
Location: Toronto, Canada
Posts: 15
Pinky's Brain wrote ...
DC is not very good at putting a lot of energy into corona ... you need too much space. Here is one option for making a corona generator with a pulsed HV source, although if you're messing with ignition coil it's probably a little too high grasped :
Also while it's not technically corona, Dielectric Barrier Discharge (just google it) has similar characteristics. Unlike the above paper it can work with plain HF AC rather than needing ultra-short pulses ... it's comparatively easy to build.
Of course Tesla coils can also produce corona quite spectacularly if you put a nail on top, not very practical though.
What exactly are you trying to do?
But Doesn't a ignition coil Output AC current? Isn't a dielectric barrier discharge what I explained in the original post? glass is a ceramic.I can barely find a ignition coil so I cant obtain a NST especially one without a GFI.
The purpose of the device is to produce o3 from o2. specifically it will be used to purify water (for demonstration purposes)
I do believe that a ignition coil is a pulsed output as the input is a square wave. I don't trust the ozone generators that you buy, if they actually create any ozone it probably less than substantial.
I was thinking of replicating a generator from this patent: but since a discharges collect on edges it may not work. also the distance between the electrode changes so it may arc.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Marcus Quintilian wrote ... I was thinking of replicating a generator from this patent: but since a discharges collect on edges it may not work. also the distance between the electrode changes so it may arc.
Charge collects on edges, but that is neither here nor there. Using discharge from a single sharp object will just make the gas hot ... the advantage of barrier discharge is that it wastes relatively little energy on that. The method from the patent is a barrier discharge method, and looks okay. It can't really arc, the inner cable is insulated.
An ignition coil used in the same way as in a car with a single switch and flyback will generate a monopolar pulse, so not AC unless you float the circuit at some voltage below ground using a DC high voltage supply ... or you use a more complex drive on the primary.
PS. Ozone is of course toxic, you need blow the air out a chimney after processing the water.
PPS. when people say flyback here they usually mean a Royer oscillator feeding a forward transformer ... here they just tend to be build with TV flyback transformers with the diodes removed, but not as flybacks as such.
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Corona Generator
