How to Design an Electronic Ignition Transformer with an Output around 20 kv?

Your ignition transformer will work if connected in "series" with a capacitor rated for AC @ 150v above mains voltage. on 50 or 60 htz. the value of the capacitor should be chosen carefully. in order to raise the voltage above 20kv.

You could start with 5 mfd. this device will be extremely dangerous and probably will not be continuously rated.

All, oil fired ignition systems rely upon the ignition system pruducing a spark at all times, that the fuel is being pumped.There for, you will require a continously rated transformer.

Optical detectors are used to detect the oil has been ignited and is burning correctly in the furnace, should the flame be extinguished the for any reason, the pump will shut down ,and cannot be re started for a timed interval ,

This is to allow the furnace and flu to clear of all unburned fuel, as re ignition could cause an explosion.

Experimenting with high voltage can kill.

GF

Remember that an automotive ignition coil does not work on the principle of a transformer as such... the turns ratio is only 100 to 1, so 10 volts ac in gives roughly 1 kvolt out (usually much less).

These coils work by passing a current through the primary and switching the current off quickly with little sparking... this produces a huge back emf in the primary up to 500 volts which is transformed up to 50 kvolts or more...

An auto ignition coil is designed for a low inductance so that the dwell or charge time is minimised and so the pulse rate can be very fast...

In your application you would need a fast, high voltage switch to interrupt the primary current at a high enough rate to produce a rapid firing of the spark...

John.

It sounds like your trying to work without electric power maybe in the field .

It may be easier to use a small generator to supply power to run a conventional system or it might be possible to use an alternator or generator from an automotive application to generate needed power .I wonder if a magneto would do the same ?

Eman,

You are quite right, But this guy wants to establish the voltage needed to strike an arc to light his burner.

He ses 20kv is insufficient so he must know the relation ship to electrode distance and breakdown voltage, The set up I suggested: using a capacitor to de couple the primary winding using AC, should give him a spark, perhaps he could use a diode in the circuit as well. to provide a pulse as you suggest. It would give him an idea on what voltage he needs fire up the fuel.

I have had vehicle ignition coils you could see in the dark by the corona. perhaps he should wind a Tesla coil.

GF

Why do you want to re-invent the wheel??? Electronic oil burner ignition transformers are available off the shelf as the industry is switching away from the heavy transformer type. Any plumbing supply company that sells oil burner parts should have an ample selection with various mounting brackets. Go get one.

Try Flyback Transformer from TV Tubes--the bigger the tube size-the Higher the HT volts

Muk.

That suggestion is just the ticket. I have a bunch of those in my collection, but have not been able to figure out how to wire one up. I don't need the frame or fly back winding and want to retain the line generator circuit which I think is used as the main primary. These transformers have about 12 connections.for Cb mounting, none of which seem to configure by resistance measurement, for identification as to what their function might be?

Perhaps you could help me out on this? a circuit using one of these for generating high DC voltage would be very useful for my corona experiments.

GF

Gf

I did these 40 years back.None of those hardware,VTVM'S, NTSC raster generators exist!

You will have to get hold of an old TV mechanic who still can rig up the equivalent of raster and flyback generators from bygone sets--or make up ad-hoc pulse and digital circuits out of modern IC's to do just that. Not too complicated. keep them dry-will always work.

I am sure you will find vintage tv fan club near you.

Best!

MM

most of thess transformer work as negtive active( flyback) way. so they have a gap to prvent saturate. you can use a lm555 under 12V power to implement.

they store engery in the gap and then release fast to produce hight voltage. there are lots of exple on the net, try to search.

show me your core area, I can help you to calculate the turns. EI12 could be done for the ignitor. I think

2 suggestions #1. buy an oil burnner igniter $100 if you shop. they come in 12vdc,24vdc,120vac,240vac with a range of outputs. other wise #2. check the "tesla coil web sites" for a solidstate tesla coil they range up to 100,000 volts and most wil work continious for several hours. P.S. just have to love tesla

Yeah! An auto ignition coil is designed for a low inductance so that the dwell or charge time is minimized and so the pulse rate can be very fast.

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