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Re: [TCML] VTTC-tuning. John got me started ;-)
No,I got nothing clever on mind regarding direct measurments of top volts.
But if you know exactly current distribution along the secondary,than you
can calculate toroid voltage very accurately.If the system works at fo than bigger the
toroid better the method of estimatimation I propose becouse the coefficient c
in the formula V=c*L*di/dt approaches 1 (current is almost evenly distributed along the coil).
Since coilers like to install comparatively quite a big toroids on the secondary these days,and
it is easy to measure secondary bottom currents,I think this of estimation should work reasonably
well.BTW,why is so important to know top volts very preceisely?
Dex
--- bartb@xxxxxxxxxxxxxxxx wrote:
From: bartb <bartb@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Mon, 06 Apr 2009 19:37:55 -0700
Hi Dex,
I wanted add something about top volts. We have thought long and hard
about real time readings of top volts. It's not an easy task. But if
through your experiments you devise a means of measuring top volts
reliably, please share with us. I realize (as do many others) about
estimation of top volts based on base current measurements as well as
other methods, however, real time calibrated measurement is very much
needed in this field. If you happen upon a method that you believe is
accurate, please share your thoughts. We've looked at the high dollar
capacitive dividers and all of that type of "normal" equipment. This
situation is a bit different as we would like to know the voltage and
charge at the top load at the point of inception.
My best,
Bart
bartb wrote:
> Hi Dex,
>
> Let me point you to Paul Nicholson's TSSP site. There have been
> numerous measurements made regarding current distribution, base
> current measurements, etc. There is a link on the front page to
> pn2511. Read through this document (it's right down your path of
> interest). This may give you a better understanding of what is
> happening in the background of Javatc which is accounting for the
> distribution along the secondary.
> http://abelian.org/tssp/
>
> Take care,
> Bart
>
> Dex Dexter wrote:
>> Yes ,you understand me now.
>> The problem with this can be that current distribution prior and
>> after spark breakout across secondary isn't the same.
>> That's the capacitance spark loading effect.
>> That will affect more tesla coils with small toroids but big sparks.
>> We can measure bottom current and make the estimation only.
>>
>> Dex
>>
>> --- bartb@xxxxxxxxxxxxxxxx wrote:
>>
>> From: bartb@xxxxxxxxxxxxxxxx
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Cc:
>> Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
>> Date: Fri, 3 Apr 2009 18:59:48 -0700 (PDT)
>>
>> Hi Dex,
>>
>> (hope you get this ok. My server has a problem and I'm using a backup
>> web
>> mail thing to write this).
>>
>> Are you talking about capturing base current waveforms and looking at
>> the
>> data just before breakout? If that is the case, then yes, I agree with
>> you. This will eliminate everything after breakout.
>>
>> Excellent! I think I understand where you are going with this. As
>> long as
>> you store the data and differentiate the time at which breakout occurs
>> (ignoring anything after breakout), then yes, you will get a good
>> look at
>> top volts in a one-shot mode of operation. Continuous operation will
>> prove
>> difficult of course.
>>
>> Take care,
>> Bart
>>
>>
>>
>>
>>> Hi Bart,
>>> No I don't think so.
>>> It doesn't depend on the temperature of the day,humidity,radius of
>>> curvature etc.
>>> If you consider it more it is not the formula for the prediction.
>>> It is formula for calculation if you know secondary base current (or
>>> given
>>> the current).
>>> That's the voltage developed across inductor.
>>> The only unknown thing is "L" which varies from design to design and
>>> size
>>> of topload.
>>>
>>> Dex
>>>
>>
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