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4hv.org :: Forums :: High Voltage
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Schematic for HV ignition coil driver ?

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Electrified
Wed Feb 06 2008, 02:49AM Print
Electrified Registered Member #1291 Joined: Wed Feb 06 2008, 02:34AM
Location:
Posts: 5
 		First: Hola! Im new here, but dont worry, ive looked thru the board, and couldnt find a thread that seemed to answer my questions.

Ive tried the schematic shown on penguinslab.com (which atm seems to be down?), but.. I cant make it "run".
I can get a nice spark at about 60kV, but it wont run.. It seems like the MOSFET stay on the On-state when i apply power (12V), and only drops to 0 when i turn it off.

So basicly i can only make it spark when i apply power and remove it right after.

Its a basic build with a 555 oscillating and driving a power MOSFET, but something seems to be wrong - but i cant figure out what.

Im using an oil-free ignition coil - could that be problem?
If any of you have a working schematic, then feel free to post it.

Thanks.
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CompWiz
Wed Feb 06 2008, 03:13AM
CompWiz Registered Member #1038 Joined: Mon Oct 01 2007, 08:02PM
Location:
Posts: 96
 		Link2

I used the zvs flyback driver to do it

It works better if you use a higher input voltage
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Firnagzen
Wed Feb 06 2008, 03:15AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
 		Sounds like the oscillator is busted. Did you use a socket for the 555 IC or did you solder to it directly? Heat kills ICs, maybe the 555 is broken. And make sure you soldered everything correctly, of course.
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Electrified
Wed Feb 06 2008, 02:37PM
Electrified Registered Member #1291 Joined: Wed Feb 06 2008, 02:34AM
Location:
Posts: 5
 		CompWiz --> Got a link for that? ^^

Firnaqzen --> I use a test-board. As far as i can see, the 555 is working just fine.
With an oscilloscope i can see the cycle, and i can change the duty cycle too (pot meter).
At the output from the MOSFET, it swaps between 1½-12V - i have no idea why i wont go all the way to 0.

When it arcs, i get some noise on the ground - approx 500V peaks.
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c4r0
Wed Feb 06 2008, 02:43PM
c4r0 Registered Member #151 Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
 		What about thyristor driver? Works pretty well and is simple, maybe you should try it smile Here's my driver - Link2
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Electrified
Thu Feb 07 2008, 02:25AM
Electrified Registered Member #1291 Joined: Wed Feb 06 2008, 02:34AM
Location:
Posts: 5
 		Looks nice c4r0, but i more need a circuit for 12V only. Gonna power it from a car battery.
Any thyristors you can recommend?


I also have a flyback somewhere, but i have no idea how to connect the pins on it - it got aroundd 18 pins or so, alligned in a U-shape.
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Shaun
Thu Feb 07 2008, 03:09AM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
 		Your original schematic tends to work very well; I would at least get it working since you are already mostly done. That way you can see if it at least satisfies your needs. If its not powerful enough, then start working on a new driver.
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Electrified
Fri Feb 08 2008, 01:51AM
Electrified Registered Member #1291 Joined: Wed Feb 06 2008, 02:34AM
Location:
Posts: 5
 		I dont care if i have to build a new circuit - as long as get something to work ;)

But testing the 555 alone shows that it works fine, but with the power transistor on, it seems to disburb it someway.

It suddenly struck me, that adding a BC547 to take some load off the 555, might solve the problem. What do you guys think?
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flannelhead
Fri Feb 08 2008, 01:53PM
flannelhead Registered Member #952 Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
 		That could do the job, or use a totem pole and a mosfet: for an example look here: Link2
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Arcstarter
Mon Feb 11 2008, 11:44PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		i had the same problem.i tried numerous different circuits and made them each up to 10 times and it neer worked.i got it now but i dont know how
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