[TCML] Sec design trade-offs and considerations

[Chris Swinson]

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 at c.dk>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
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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>>
>>
>
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