Paul, is there a way to tap the unrectified output of the alternator to
go through a transformer and power the capacitors for the CD ignition?
Seems that if we could use this AC output it would be easily amplified.
The downside would be getting the system started while you are cranking
the engine. Just thinking out loud.
Maybe a small alternator could be modified so that it has a sole
purpose
to drive the CD system?
Kevin Alderman
That is a great idea Kevin. We need to look into that.
I am working on the 12 volt high voltage power supply design
as we speak.
This little $8 1:10 transformer just about all we would need.
Paul Lamar
-----------------------------------
This little permanent magnet Kubota alternator would work. No diodes.
So would the output from just about any outboard or motor
cycle alternator. Most of those have the high voltage
coil built in.
Paul Lamar
another thought- a small 300w inverter would work. It will output 125v
at 60hz ac. 300 W at 125 volts is just under 2.5 amps. Perfect. No
moving parts, light, simple. Could use 2 for redundancy. Would be just
like your shop unit without the plug. I have a 1500W unit under the seat
in my truck, not too big, weighs about 3 lbs. I think this is too big
for this application, but it would work I think.
I think I just found my ignition source-
KA
I tried that too. The output voltage is not high enough but you could
use it with it two 120V to 240V
60 cycle transformers. Gets kind of heavy but it would probably work.
BTW that small transformer I have won't work with an alternator. It is
something called
a current mode flyback transformer. You need to shock the primary with
10 AMPs.
The wire connecting the IGBT to the transformer and battery is starter
motor gage :)
I just found something better than a CD4050 for driving IGBT's.
Brand new chip this month. The current from a 4050 is 360 ma max.
the new chip is 4 amps. IGBT's need a lot of gate current.
Fairchild FAN3225C_F085
I hope to get more energy in the spark.
Paul Lamar
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