It works! This is the modular HV power supply for the modular CD ignition.
Everything from one power supply and one CD module per spark plug down
to one power supply per engine and one waste spark coil per rotor.
Thanks to all the smart people on here that have helped.
Thanks to my wife Robin for putting up with my 16 hour a day work habits :)
It has been a mount Everest learning curve.
The IGBT is running at about 80 F and the input voltage for
the power supply is 8 volts for the scope picture shown.
With no load input current is less than a tenth of an amp.
The scope is set to 50 volts per division so what you are
seeing is 350 Volts peak. That varies with pulse width and
output current will vary with frequency.
The time base is 10 usec per division.
The osc is running at 40Khz.
The IGBT is the same one I am using in the CD ignition modules.
The coil is the same one Lin Tech uses.
The idea here is to use a sledge hammer IGBT.
Parts cost less the PC board is less than $20.
No tricky, expensive and troublesome LSI chips :)
CMOS 555's and 4050's are less than $1
All this is initial. Pulse width is manually adjustable as is the frequency.
I am very relieved. It has been looking bad and too hard to do for years.
Paul Lamar
Great work, Paul. Seems to be a very simple setup. How do you plan to
do reliability testing?
It's not clear to me how you will control ignition advance. Will you be
using a distributor to do that, or will another board feed the firing
signal to this one? I recall seeing you working on some other boards to
read the hall effect sensors.
Josh
We don't need automatic proportional advance in an aircraft. Here is
the Model T way
of doing it. 22 degrees BTDC most of the time and up to 50 degrees BTDC
for high
altitude cruise. Check your MPG with a GPS and flow meter.
This is a trick I learned from Klaus at Light Speed although Paul Lipps
designed it to work
electronically and not mechanical manually. I like to keep it simple
and easy to
trouble shoot and repair.
Paul Lamar
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