 My wierd ignition coil driver
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Berni
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Tue Nov 20 2007, 08:06PM
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Registered Member #1132
Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
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A lot have tryed that 555 + BJT kind of driver.Some time back i gave it a try and it works but at a really low power.
So one of these days i had nothing better to do so i went to make a better driver for a coil i had laying around. I think pulsing a small cap in to it would be more up to the job.Then stuck on some 25A SCRs i had laying around.Some tinkering later the coil had a nice output(Enough arc over the coil with no problem) I got about 4cm arcs from it.
Its not a very smart circuit tho since if both SCRr conduct at the same time it will get stuck in a short circuit over the supply.This state happens if they are switched too fast.But they cant even handle 1Khz and a ignition coil can do a lot more.So im trying to figure out how to switch faster without screwing it up.
Then i also had a idea to try and put a small coil on it and see if it works for induction heating.The coil was about 5 turns of thick wire.Then trying to put some scissors in to it and they got relay hot in a few seconds, it also melted solder.The fire rate of the SCRs could be picked up well above 1Khz in this setup tho.
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Dr. Dark Current
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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
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Nice sparks. Though similar ones could be achieved by the classic dimmer driver, I think.
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Berni
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Registered Member #1132
Joined: Mon Nov 19 2007, 06:15PM
Location: Slovenia
Posts: 84
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Oh and the heatsinks are probably not even needed since the SCRs don't even get warm, but they are there just in case i did something to overheat them.
Also i have searched the web a lot and couldn't find anything that looks like my circuit. I was hopeing on finding ways to improve it.
So dose anyone have ideas how to do so. Mainly interested in a way to raise the switching frequency. When the coil has no load its pretty low, way lower than i want it.
Almost forgot the SCRs are 2N6509
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