Ignition Coil Projects

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Kurt,
Thanks for the info. I have been collecting a lot of information about 
powering/driving ignition coils recently. There seems to be a considerable 
interest in this area, mostly by those also interested in building Tesla 
Coils. In fact, from what I have been ascertain, this is very often a 
precursor to someone building a Tesla Coil. It's almost like an 
introductory project.I have been considering gathering as much information 
as I can on this subject and compiling it all in one place where anyone 
with an interest can access it.

Is this a decent idea and where would I put the information? I don't 
currently have a web site but that is easily corrected. One option would be 
to create a web site and put it there. Also, I think that should I do this, 
the location should be on the Tesla Ring.

Any thoughts?
Paul
Think Positive

----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Thursday, May 05, 2005 12:25 AM
Subject: Induction Coil Cap Discharger ( was: No Terry Filter)

> Original poster: Kurt Schraner 
<<mailto:k.schraner@xxxxxxxxxxx>k.schraner@xxxxxxxxxxx>
>
> Hi Paul Brodie, all,
>
> ...well, slightly OT. I've buildt a modified version of Ed Phillips's
> DC-resonant induction coil driver. The schematic diagram can be had at:
>
> 
<http://home.datacomm.ch/k.schraner/Cap_discharger_EdP8.jpg>http://home.datacomm.ch/k.schraner/Cap_discharger_EdP8.jpg
>
> The main differences to Ed's driver are:
> 1.) Having 230V/50Hz AC in Europe, no voltage doubler is needed.
> 2.) Instead of the Quadrac, a thyristor + anti-diode is used.
> 3.) An RC snubber had to be added to the thyristor, in order to
>     prevent shoot-through of the thyristor.
> 4.) Power 10ohm/100W resistor, limiting shoot-through current, added.
> 5.) 6.3A fast blow fuse.
> 6.) Dimmer for voltage control (for inductive load; dimmer optional!)
> 7.) High discharge capacitor value of seriesed 2x40uF/400V caps = 20uF
>
> Main problem, is to find a non-saturating charging-inductor. As can be
> seen, the value of it is not critical (Ed's 6H vs my 0.26H). This driver is
> much friendlier to your AC-line network, regarding pulse generating
> disturbances, than a simple dimmer induction coil driver. Another benefit
> is the variable discharche frequency (~BPS). The value of the discharge
> capacitor may be adapted to the power needed (my 20uF are for power
> induction coils). A 25cm (10") spark on one of my bigger induction coils
> may be seen:
>
> 
<http://home.datacomm.ch/k.schraner/DSCN1723.JPG>http://home.datacomm.ch/k.schraner/DSCN1723.JPG
>
> My current realization of the driver may be had at:
>
> 
<http://home.datacomm.ch/k.schraner/DSCN1724.JPG>http://home.datacomm.ch/k.schraner/DSCN1724.JPG
>
> I'm quite happy with this induction coil driver, which is properly working
> now. And I think, it's much easier to control the operation of an induction
> coil by storing the bang energy in a capacitor, than in conventional
> interruptor mode, in the inductance of the primary.
>
> Best regards,
>               Kurt
>
> Tesla list schrieb:
>>Original poster: "Paul B. Brodie" 
<<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
>>Ed,
>>Do you have a design for a resonant charging driver for ignition coils? I
>>have been wanting to do this but I haven't seen any examples where someone
>>else has done it. So far, I have run my coils with a dimmer and 2 MO caps
>>in parallel (1.95 mF total) and with a 555 wired as an astable
>>multivibrator running between approximately 200Hz and 1000Hz.  I'm
>>probably crazy but what I had in mind is using a MOT with a voltage
>>doubler driving a resonant charger and cap using either a spark gap or
>>SIDACs to discharge the cap through the primary of the ignition coil.
>>Peter Terren has an example of driving an ignition coil with a MOT and
>>SIDACs on his site. I would appreciate any advice.
>>Paul
>>Think Positive
>
>
>
>