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Re: [TCML] Thumper, the worlds most advanced tesla coil.



You're correct that directly clamping the burden impedance will screw things
up, but that's not what I'm doing.  The clamping diodes are connected to the
burden impedance through a 1K resistor, so the diodes do not significantly
load the CT and the phase lead is not affected, regardless of the amplitude
of the signal.  I wish I could post a schematic, but apparently the mailing
list doesn't support attachments (not sure if my last email got through at
all).

-Mike

On Fri, Jun 11, 2010 at 1:00 PM, Finn Hammer <f-h@xxxx> wrote:

> On Fri, 11 Jun 2010 14:27:44 +0200, Michael Twieg <mdt24@xxxxxxxx> wrote:
>
>  So I tried messing with the hysteresis network on my comparator, and I
>> added
>> some extra shielding, but still got poor results, so I went ahead and
>> whipped up a variation of your predictor.  I think there are two things
>> desirable in a zero crossing detector:  a large dv/dt at the zero
>> crossing,
>> and the appropriate amount of phase shift, which should be constant over
>> amplitude.  So I just made a LR shunt like yours, but used a large burden
>> resistor (10ohm) to give a large signal, then clamped it with diodes to
>> limit the signal to a range acceptable by my comparator.  Circuit
>> schematic
>> attached.
>>
>
> You will not get any leading current signal if you clamp with diodes.
> Inductor must be allowed to enjoy full swing of signal, otherwise it doesn't
> work.
> You should try to do a simulation, and see.
>
>
> Cheers, Finn Hammer
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>
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