RE: SCR & PRIMARY CONNECTIONS (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 9 Nov 2007 21:03:33 +0000
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: SCR & PRIMARY CONNECTIONS (fwd)

Maybe I'm misunderstanding how you plan to use the SCR.  I thought you
were using the SCR as an active switch, switching the primary inductor at
the resonant frequency of your coil, no doubt a great deal faster than 100
Hz.  If the SCR is only switching at 100 Hz, what is it that's driving the
primary at Fres?

Gary Lau
MA, USA

> From: Chris Swinson <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: SCR & PRIMARY CONNECTIONS (fwd)
>
>
> > I don't believe that it's even possible to use an SCR in a Tesla coil.
> > SCR's are very slow devices.  And functionally, they're definitely not a
> > drop-in replacement for an IGBT - they behave very differently.
> >
> > Regards, Gary Lau
> > MA, USA
>
>
>
> I am only running at 100bps so they will work fine. Tank transfer is less
> than a cycle and free resonance is used so no primary tuning is even needed.
> the IGBT works but the inbuilt diode is clamping half of the cycle. SCR will
> switch on with a lot less loss. The break rate is only 100hz so almost
> anything will work.
>
> I have to redesign my layout to use the SCR as it is much bigger than the
> IBGT brick so was wondering of the primary RF will effect the SCR if it is
> on the same level and right next to the primary connections.
>
> Chris
>
>
>