Re: TSG with DC?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "R Heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

on 11/03/01 9:30 PM, Tesla list at tesla-at-pupman-dot-com wrote:

> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jimlux-at-earthlink-dot-net>
> 
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Saturday, November 03, 2001 7:38 PM
> Subject: TSG with DC?
> 
> 
>> Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <youngs-at-konnections-dot-net>
>> 
>> List engineers,
>> 
>> Can any of you provide ideas for using a TSG with a pure DC (i.e.
> filtered)
>> power supply?  Specifically, I need ideas on how to prevent a power arc
> when
>> the TSG fires.  That is, some method which transfers almost all of the DC
>> supply energy to the MMC, not to the TSG.
> 
> A charging inductor in series with the DC supply would be the traditional
> approach., particularly if combined with a series diode.
> 
>> 
>> I can only think of two ways:  1) have a tremendous blast of air through
> the
>> gap to "blow out" the power arc - so it functions something like a RSG at
>> high speed, or 2) Have a DC supply which "folds back" when the spark gap
>> fires to prevent a power arc.  I think Marco Denicolai's supply functioned
>> that way.
>> 
>> In the meantime, I shall try unfiltered DC supplies such as a MOT circuit
>> which offsets the HV sine wave so it goes to zero each cycle.  The only
>> problem with that is the BPS can only be 60 which doesn't transfer much
>> average power to the tank circuit.
>> 
>> --Steve
>> 
>> 
>> 
>> 
> 
> 
> 
I have found dc coils to be less problems. The rise time of the SG is fast
or high frequency so a simple coil acts to disconect the coil from the po.
wer supply for the moment of firing. I have used a air core coil of 15T
3/4in dia 6in long with sucess. I have used a 15T toroid coil of hi-voltage
wire on a tv deflection coil core with sucess and I am now using a "T"
filter in each leg of the power supply. My "T" filter is a 1k wire wound 25w
resistor (coil) with a csp shunt of 9 ea .0033u capacitors with a 15meg r
across in series, and a tv def coil toriod coil core to the spark gap. I am
trying to minimise RFI from my coils.
    Robert H