Can I do that, and then how do I rectify it at that high of a voltage
it seems a bit excessive if you ask me. My experience is that ignition coils are usually driven with far lower voltages, on the order of 12V-24VDC. Of course, the output is significantly higher...I *have overdriven automotive ignition coils in the past (about 30%-50% above the expected voltage,), but they ran hot and it shortened their lives considerably...(erm...something in my head keeps telling me quietly that oil furnaces may use 48V primary ignition coils, but I'm too lazy to google it)
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The ignition coils when using 12-24V use pulsed DC therefore there is a voltage spike in the primary.
Yes that's true. I should have been more clear about what I meant. Otherwise you would not generate a spark.There is a good reason to boost the value beyond the normal spec under certain "non-standard" circumstances, which I won't be going into here, but as I said, there are limits, and there are costs..
775V is excessive for a ignition coil the secondary coil might breakdown. If you want to drive ignition coils with DC have a look at this it is simple and effective, however for some reason I still need to put in a rectifier diode on the secondary if I want to drive a Tesla coil. To rectify it at high voltage use a lot of 500-1000V diodes in series.