[Diy_efi] Ion Sensing project

[The Punisher]

Anybody ever heard of anyone trying to pulse a HEI coil at high frequency 
with 300-400volts from a LARGE cap using an IGBT?

I got this idea while trying to build a high frequency arc stabelizer to do 
some tig welding. The arc stabelizer is about 75% complete right now, I just 
have to hook up a coil and a few little things, testing will probably take 
place next week using a modified HEI coil(removed the core to make it an 
"Air core" transformer. If it works out on the TIG I might try it on an 
engine. A few changes would be required in the circuit, but the idea would 
be the same.

Thoughts?

>Hi,
>
>the problem with standart inductive ignition is the dwell
>time of the coil, where the magnetic field build's up. In a
>CDI you load a capacitor and not a coil, wich is way faster.
>(not because it is capacitor, but because it gets loaded by
>400V, not 12V lik ethe coil)
>The standart inductive ignition gets the high primary
>voltage by opening the current-path with the braker. The
>magnetic field collapses and produces a high induction
>voltage wich is then transformed to HV.
>On the CDI you directly put 400 V to the primary winding, so
>you have less loading time + no time needed to collapse
>the magnetic field -> faster ignition.
>
>Hope this get's clear in spite of my bad english ;)
>
>Marc
>--
>Marc Reibel <marc at reibel-web.de> <http://www.reibel-web.de>
>PGP Key: 0xBC41A832/B4BB 179B 38B1 6C65 31FA B51C DBB6 A50A
>ICQ: 42168505
>
>
>
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