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From: Mike Poulton
Subject: Re: Problems with MOSFET drivers
Date: 18 Nov 2002 11:28:35 GMT
Organization: MTP Technologies
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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<new, but not by much, then leave frequency where it is.
Step 8: goto step 3
This doesn't seem terribly difficult. On a 4MHz PIC, you could get far
more iterations per second than one really desires. The resonant
frequency doesn't fluctuate that much. It's enough that it's worth
correcting for, but it isn't so much that wild variations occur whenever
someone walks in the room. Driving off-resonance isn't the end of the
world, either, assuming the driver is decently designed.
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