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Re: Inductive Kick Effects - was- Re: cap firing voltage scope measurements question (tests)
The ramp voltage doesn't indicate a ramp current. When you supply a voltage
to and equal amount of voltage there is no current flow. An inductor can
only follow it's time constant, and current can only increase at a rate that
equal to it's time constant. Alright if you calculated what the inductive
reactance would be in the first nano second as if it were a frequency, then
you see the kind of inductive reactance that is limiting current. Once
current has been established through the coil, and this must be a greater
time period than a quick shut off can produce.
A ramp is produced by a capacitor as it charges. When you move the
calculation to 2 nano seconds as if it were a frequency the inductive
reactance drops. A coil is self inductive, and if you suddenly try to halt
current flow though it, it will try to compensate. The higher the frequency
of cut off, and the higher the voltage of the self inductive pulse, and this
can be felt through the secondary. Use a single generator and test that one
out with a true ramp current. You will see a difference. Then maybe use a
MOSFET to amplify the current in the situation.
James.
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>At 05:43 AM 6/19/99 -0400, you wrote:
>>
>>A ramp voltage preforms the best at producing Kick voltages but, they
>>require an amplifier to drive the coils, and eliminate the potential of
>>using spark gaps in normal fashion.
>>
>snip....
>
>Since the transformer is acting much like a constant current source, the
>voltage across the primary cap should tend to rise as a ramp. I went back
>and checked for this and indeed! The charging voltage is very linear
>indicating that the constant current effects are charging the cap in a
>fairly linear way!
>
>Cheers,
>
> Terry
>