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From: Winfield Hill
Subject: Re: Problems with MOSFET drivers
Date: 18 Nov 2002 04:31:32 -0800
Organization: Rowland Institute
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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>On 18 Nov 2002, firstname.lastname@example.org (Adam Seychell) said:
>> Then explain how your going to find the resonant frequency
>> with knowing only the averaged magnituded of primary current.
>> Especially for something as fluctuating as a tesla coil.
>Step 0: start oscillator at frequency known to be low.
>Step 1: read and store primary current
>3tep 2: increase frequency slightly
>Step 3: read new primary current
>Step 4: compare new current to old current
>Step 5: if new>>old, change frequency more in same direction,
>by an amount determined by the change in current (big change in
>I gives small change in F).
>Step 6: If new<Step 7: If old<>new, but not by much, then leave where it is.
>Step 8: goto step 3
Arghhh! Please let me suggest you measure the phase of the
current out of your driver with respect to the voltage. You'll
find that at resonance it's in phase, below resonance where the
load appears inductive it lags, and above where the load looks
capacitive it leads. Readymade for generating a servo signal,
or at least a meter reading to tell you which way to tune your
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