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



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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