Re: [TCML] DC resonant charging: has anyone tried SCR's in this design?

[Robert M Janson <rmej@xxxxxxxx>]

On Wed, 5 Dec 2007 18:21:18 -0000 "Chris Swinson"
<list@xxxxxxxxxxxxxxxxxxxxxxxxx> writes:
> 
> ----- Original Message ----- 
> From: "Robert M Janson" <rmej@xxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Wednesday, December 05, 2007 5:37 PM
> Subject: [TCML] DC resonant charging: has anyone tried SCR's in this 
> design?
> 
> 
> > Hello,
> >
> > I'm working on DC resonant charging unit for 20kV tank capacitors. 
>  I'm
> > wondering if anyone has tried high voltage SCR stack to trigger 
> resonant
> > charging, i.e. delay recharging of tank capacitor until after the 
> damp
> > oscillation dies out in Tesla coil primary circuit?   It would be
> > interesting to try it for a single pulse mode or skip by number of 
> pulses
> > mode while RPG is at the ideal speed.
> >
> > Rob
> >
> 
> I am working on such a design myself, though my first one is low 
> voltage, 
> that is exactly the same but just uses 100V and not 20KV. I am 
> however 
> hunting around for parts to make a 20KV system. Finding SCR's is not 
> easy at 
> those voltages and amp levels.
> 
> May be a good time to ask on the list if anyone has used a "cheap 
> off the 
> shelf" SCR which can take the high peak amps.  You can buy 20KV 
> SCR's if you 
> can afford them!
> 
> My SCR only fires at 100hz the design would take forever to explain, 
> but the 
> SCR discharges the tank cap and also forms a resonante 100hz circuit 
> which 
> becomes a voltage doubler...
> 
> chris
> 
> 
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> 
On Wed, 5 Dec 2007 18:21:18 -0000 "Chris Swinson"
<list@xxxxxxxxxxxxxxxxxxxxxxxxx> writes:


Chris,
You could google for surplus 6500V thrysistors made by ABB, sometimes
they are sold on ebay for $25 each.  I have two 6500V thrysistors in
series for total of 13kV that I plan to try out in the 20kV DC resonant
charging unit and see how it goes...  See
http://www.richieburnett.co.uk/dcreschg.html about DC resonant charging,
but without SCR in design.  

Rob
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