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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Drive your coil at less frequency because less frequency means less corona. But this will probably not be possible with your circuit as ferrite cores don't like low frequencies.
If I had to run an iggy coil to get maximum power out of it, I would use a half bridge running at 100-1000Hz.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
CompWiz wrote ...
there was corona all over the ferrite one time...
I don't know how get the frequency lower. adding more capacitance? more turns on the primary?
you could get lower freq. by increasing the cap but if you go too low, the core will saturate and get hot and you will draw big currents from your power supply. Maybe you can wind a center tap coil around the outside of the iggy coil and drive it directly but I dont know how well this will work.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
This is a problem I've had with ignition coils.. Since I too don't like oil I used Araldite(TM) epoxy resin adhesive - worked pretty well for quite a long time.
Somewhere around 45 kHz (your coil may be different) the self-inductance of the secondary resonates with it's self-capacitance and the result looks like your video.
Imagine if the capacitance between the inside and outside of the coil-top insulator is 1pF, not much really. Irms=sqrt(2) x pi x F x Vpk x C = 7 mA rms ! (If Vpk = 35 kV .. reasonable estimate)
Just 1pF will cause 7 mArms of high frequency current to 'flow' through the insulator!
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ZVS ignition coil driver!
