Re: [TCML] Sec design trade-offs and considerations

[Finn Hammer <f-h@xxxx>]

Chris,

I have a problem visualizing how the 1000uF cap takes part in the 2mHz 
oscillation.
Could you post a schematic?.
You mentioned high Q and low voltage. What voltage do you have in mind?

Cheers, Finn Hammer

Chris Swinson skrev:
> Finn,
>
> There are 2 circuits with in effect 2 tanks caps, one does the work 
> 1,000uF which is discharged into 10nF 1uH primary, about 2mhz. the 
> 1,000uf just supplys the current, really there are 2 tank circuits in 
> operation.
>
> Chris
>
>
>
> ----- Original Message ----- From: "Finn Hammer" <f-h@xxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Sunday, November 25, 2007 7:39 AM
> Subject: Re: [TCML] Sec design trade-offs and considerations
>
>
> > Chris,
> >
> > To resonate a 1uF cap at 2MHz, you need a 6.3E-9H primary inductor. 
> > That`s awfully small.
> > (about one inch diameter, single turn)
> >
> > Surge current @ say, 1000V will be 12+kA
> >
> > Di/Dt will be 100kA/uS
> >
> > Do you have a SCR that doesn`t latch at these conditions?
> >
> > Cheers, Finn Hammer
> >
> > Chris Swinson skrev:
> > > John ,
> > >
> > >
> > > > Chris,
> > > >
> > > > It sounds to me that you're planning to use the SCR to replace the 
> > > > spark
> > > > gap.  The tank will ring down while the SCR is turned *on*.   The 
> > > > SCR will
> > > > extinguish when the energy rings down sufficiently.  If this is  
> > > > what you
> > > > plan, it's not a new idea.  I've used SCR's in this way in Tesla  
> > > > coils,
> > > > Lou B. has done it, Malcolm W. has done that and probably others  too.
> > > > Terry's SISG coils use the same concept except he used an IGBT  which
> > > > is kept on during the transfer time.  The overall concept being that 
> > > > the
> > > > solid state
> > > > device is not switched at the RF frequency, but rather at the 
> > > > break-rate
> > > > frequency.
> > > >
> > > > John
> > >
> > > True the SCR idea is not a new idea. You are correct in what you say. 
> > > Though whay should be a new idea is to use 2mhz high Q system and a 
> > > 1,000uF tank cap all at low voltage... If this has already been done 
> > > before then I would like to review the specs and data, would save me 
> > > weeks of time in development! I started this project about 8 months 
> > > ago now :-(
> > >
> > > Chris
> > >
> > >
> > >
> > >
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