Re: solid state ballasting?? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sun, 20 May 2007 22:49:49 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: solid state ballasting?? (fwd)

Wow DC,

That's sounds really good! Can't wait to see the end results. I happen 
to have a gapped core 28A Powerstat. The gap is near 100 mils (epoxied 
over and quiet as a mouse). Is something like this conceivable for use?

Take care,
Bart

Tesla list wrote:

>Original poster: List moderator <mod1@xxxxxxxxxx>
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>---------- Forwarded message ----------
>Date: Sun, 20 May 2007 11:18:37 -0500
>From: resonance <resonance@xxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: solid state ballasting?? (fwd)
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>We are in the final stages of "beta testing" on our dual SCR 91 Ampere 
>(Irms) variac eliminator.  We rate these to replace a standard dual stack of 
>30 Ampere variacs.
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>A small ballast is still required with a MOT and a PT or pole xmfr requires 
>a slightly larger ballast.  We use a gapped core C-core reactor with our 
>pole xmfrs.  Airgap is 100 mils.  Total C-core reactor weight is only 32 lbs 
>for up to 60 Amp control.
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>When we finish our testing in the next 30-45 days we hope expensive and 
>heavy variacs will soon become a "thing of the past".  Our entire setup 
>weighs only 3 lbs and will replace up to 3 stacked 30 Amp 220 VAC variacs. 
>Our plan is to have one to replace smaller 10-20 Amp, 120 VAC variacs, a 
>second medium size to replace dual stack 60 Amp variacs, and a third unit to 
>replace up to 6 stacked 30 Amp variacs.
>
>I hope to offer this as a "kit" in which we would fully stuff the driver 
>board, and experimenters would mount the furnished SCRs on the furnished 
>heatsinks.  They would supply the cooling fan, mount the parts, and have an 
>electronic variac with a 10 turn pot that would eliminate the large, heavy, 
>and expensive variacs now used with standard Tesla coil power supplies.
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>Results so far are very encouraging --- just need to tweak a few resistor 
>values and finish our testing.  Hope to have them ready by July.
>
>Dr. Resonance
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>>I think they do make some kind of solid state ballast
>>current control for the large high voltage transformers
>>in neon bombarder systems. These transformers are
>>usually 15 kV to 30 kV at 7.5 kVA up to 25 kVA.
>>However, I don't think that they work too well for
>>Tesla coil application as the feedback causes them to
>>malfunction, but would probably work fine for a JL
>>control. I'm sure some of the list members neon gurus
>>like Jack King could offer better info on this matter.
>>As a matter of fact, I believe I've seen Jack list one
>>of these items on ebay in the past so he may be able
>>to "fix you right up".
>>
>>David Rieben
>>    
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