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[TCML] Re: inductors for DC charging



On 2/13/23 2:58 AM, Joshua Thomas wrote:
Funny you mention this, I have a classic coil (can shape, oil filled) that
I was thinking how to use in a coil. Interested in what others have done.


There's the GMHEICSLR (GM HEI coil spark length record) - running off 110VAC with a triac - More than 30cm sparks, as I recall.



On Mon, Feb 13, 2023 at 3:37 AM Lux, Jim <jim@xxxxxxxxxxxxx> wrote:

Has anyone tried using the secondary of an auto ignition coil as a
charging inductor for a small coil?

They are 10-30 H (depending on who measured it, etc.)  They've got the
HV insulation.

I was wondering about the current handling.  Typically, they seem to
have a DC resistance of some 10 kOhm or more, and if you're driving
from, say, a NST with an RMS output current of 30 mA, that works out to
about 9-10 Watts dissipation (because I've not got a spice model of the
actual charging current, etc.)

Or, alternately, any source for 10 H inductors that can hold off 20kV?
Short of winding my own.  200 or so turns on a 4 cm diameter core with
mu=5000 would do it. Have to wind in 20 turn chunks to keep the voltage
rating, reasonable, but that's doable.
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