Ignition Coil Won't Spark from Mosfet but DOES spark By Hand??? HELP!?

[Magluvin]

here is a vid I have made using capacitive discharge of near 500v from a .13uf cap.

The small neon board from a scanner light, is charging the cap via an Avramenko plug via 1 leg of the neon transformer. By taking the other leg of the neon transformer and attaching it to an insulated wire wound around the ign coil can, the capacitive coupling through the can to the inner coil, provides a path to charge the capacitor faster than the 1 legged AV plug alone.

It provides very good spark and relatively no heat from the neon transformer nor the ign coil, as compared to running the coil via points setup. Tesla's igniter for gasoline engines(pat) is also a more efficient way to drive the ign coil than standard points setup.

Im using SIDAC's as a solid state spark gap, 2 in series, for the capacitive discharge.

http://www.youtube.com/watch?v=TR3WmK3qrws

Mags

[poynt99]

pha3z,

Two possibilities that may be snuffing out your spark are:

1) Too low of a MOSFET OFF resistance
2) The MOSFET body diode is zenering or avalanching.

.99

[Johan_1955]

Hi,


Would be good to take the Series Diode from the HV-Coil away, is keeping him away from the needed ringing, make sure Duty-Cycle is 50/50.


Regards, Johan

[TinselKoala]

No they are not.

And don't ask me questions nor tell me what to do.
Also, let the man himself decide who's being helpful and who's not.
If you are here to argue do it with someone else.

You are the one who is arguing. I am providing FACTS and REFERENCES and SUGGESTIONS to help the OP achieve his goal. I even illustrate that what I say is true by DEMONSTRATING that it is true.

Why don't you provide a reference that says the pulse-forming transformer in a CDI system is an ordinary ignition coil? Why don't you provide a video or two showing your excellent experimental work? Don't ask you questions? Don't tell you what to do..... when you are telling me what to do?

OK, fine. You clearly know more about this stuff than I do, with your two or three posts on the topic.


@Johan: I encourage you to experiment with the circuit, with and without the diode. Have lots of spare 555 timers when you do.

Here's what a properly switched mosfet coil sparker can do--- of course the component count is a bit larger and a bit more skill is involved here than in the simple ignition coil. One reason this works like it does is because --- like a flyback transformer and unlike an automotive coil, there is no heavy iron core and the coil is driven at its resonant frequency. Don't watch this, microcontroller, it will probably upset you.
http://www.youtube.com/watch?v=LFDjZ_Va9xg

[Johan_1955]

Hi,


@KookooDiesel: For Diesel savings, please look at: http://www.youtube.com/user/OostromTechnicsSL ,  based on:


@TK: For a good spark you need to the right coil related Pulse-Width, Mag & De-Mag times to get the right induction / Spark, so a PWM frequency driven is false, you need a fixed Pulse-Width (50/50) and a adjustable frequency.


This is my back ground and at that time, with Krüber and Motoplat ignitions: http://www.youtube.com/watch?v=DKDo-XkUfos


Regards Johan