Electrical igniter for gas engines A keystone to understanding by Magluvin

[Magluvin]

Oh  Some figures.

The caps are 22uf 100v
Diodes are 1kv 1A, trying to locate my box-o-rectifiers. Looking.
Full transfer is 5.6v to 4.3v. Its got to be a good portion of the downfall is the diode drop. 1v?  So higher voltages will give better results. ;]

I stayed low on voltage as I dont want to saturate. So far, using 3 AA gives similar ratio -1v diode.

So I dont think I am yet.

Much more to go.

Mags

[Magluvin]

I did a few other tests with the circuit and other inductors.
One of them is a heavily wound toroid with 20 awg, and the other is a large spindle core of 26awg and a few thousand turns.
The first (2)multi core fared better in transfer results.

The tri core averaged just over 3v using the primary as just an inductor. It had the worst results of the bunch. =[

The (3) core inductor, the cores are from chokes,all the same type and style as they were from the same salvage board, and the (2) core are from amplifier transformers. Its possible that choke inductor cores may not be good for us here.

Next will be to see what the secondaries can do.


Mags

[Magluvin]

Something the pdf said was, if you shorted the sec of a normal transformer, ya just might smell it soon. ;]

But here we dont have that issue.

I will be also trying a 3rd coil on the 2 core, shorting the 2nd coil to make the connection between cores.

Mags

[woopy]

Hi Mag

Nice setup

just some question

On your multi core (2) i mean the small toroid wounded with the bigger one, by using only the small primary toroid, (the secondary is opened) you get a transfer from 5.6 volt in the source cap to 4.3 volts in the second cap and this after transfer, right? How many voltage left in the source cap ( probably 0 ) ? In this case your transfering is anyway very good with so a small inductor.

you get about 59 % efficiency  (in energy transfer as per the bloody formula) against the standard 50 % as for a normal direct transfer. And that without taking account of the diode lost which is apreciable at so a low voltage.

For my experiment, to get a really good transfer the inductor must be much bigger, i would say minimum 220 mh (as per a primary MOT, to much higher arrounf 1 H and more)

But the interesting thing here is that you get a better transfer than normal transfer , and now  you will be able to check what happens when you will play with the secondary of the multicore. Can't wait the result.

Have you some info about the resistance and inductance of your coils ? So we can compare and make about the same testing.

Anyway bravo and good luck

Laurent

[Magluvin]

Hey Woopy

Actually my source cap gets left with the balance of the total. If the receiver gets 4.3, the source is 1.3, from 5.6v total.  maybe that will increase your eff calculations. ;]

The primary is .06ohm and the sec is .12ohm.  The wire is 22awg from radio shack. The small core is about 1 in dia and the large is about 1.5in dia.

The cores are 2 that I have had that seem different from the bunch that I have.  They have a bumpy texture, as if molded that way, or large particles. 
I had done some testing with magnets to see which cores had more or less attraction force. These were weaker than any of the size. Some others seem to be just iron with a painted or powder coat surface. I find some conduct electrically from one side to the other, some dont.

Its possible that eddy currents are desirable in choke cores.    Or the conductive ones are just cheap.

It seems as if when you chip the surface paint, if its shiny, it will conduct. If black or dark gray, most likely no conduction.  We dont want conducting cores. No eddies.

Mags