RE: PIRANHA-III Power control? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Thu, 21 Dec 2006 20:25:45 -0600
From: Brian <brianv@xxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: PIRANHA-III Power control? (fwd)

I should have the circuit modeled and results within the next week, and will
post the results to the list for anyone who wants to critique and offer any
comments they would like to put in. One of the components did not have a
model so I will need to create one off of the data sheet. I am also playing
with electronic phase shift control on another circuit that looks very
promising right now and appears to be very stable under the soft start
conditions. However it has not been tested under heavy loads, I have tested
it under lower level currents and loads specifically around 5 amps this was
an almost pure inductive load and was very impressive. So a little more work
and we will know. 

DC I will send the actual files to you offline when completed and we can go
over them and make any necessary adjusting if needed.

Brian  

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Wednesday, December 20, 2006 8:01 PM
To: tesla@xxxxxxxxxx
Subject: Re: PIRANHA-III Power control? (fwd)

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 20 Dec 2006 17:03:42 -0700
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: PIRANHA-III Power control? (fwd)



Brian is running all the data thru P-Spice and some other high-end program 
he has.  I will be able to post these when he finishes his work in the next 
few weeks.  We are looking at complete sine wave control 5% thru 95%. 
That's our goal --- with very little if any interference.

Dr. Resonance


>
> I have had discussions most of the day today with ON Semiconductor, Teccor
> Electronics, and STI Semiconductor.  Their application engineers were very
> helpful and sent me several informative diagrams.  Brian and I are 
> digesting
> their content and will propose a complete circuit in the next few days.
>
> I think we have the problem solved using optoisolated 555 timers driving
> back to back SCRs.  Teccor especially has one that is rated for 65 Amps,
> isolated mtg, and with back to back will handle up to 91 Amps Irms.  All 
> for
> only $5.60 from Digi-Key!!  p/n is S6065J.
>
> I will be doing experiments with our iron core current peak clipping 
> chokes
> using this setup.  We hope to have a complete solution by Jan 15th for the
> variac elimination problem.
>
> According to the engineers I have worked with this solution should also
> enable us to use very cheap control even with pole pigs!!  In a box 
> weighing
> under 10 lbs.
>
> The engineers also had very good snubber suggestions that I will 
> incorporate
> into my drawings.
>
> Dr. Resonance"
>
> What kind of line current waveforms do you anticipate and does
> that box weight include enough RF filtering to keep switching garbage off
> the line?
>
> Ed
>
>
>
>
>