Re: High-input SSTC: Possible?

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

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

M Smith; the number you were looking for is 1/2 the square root of 2, the
sin 45,  0.70711
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Sun, 23 Dec 2001 22:37:03 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: High-input SSTC: Possible?
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Sun, 23 Dec 2001 23:51:33 -0700
> 
> Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <sccr4us-at-erols-dot-com>
> 
> Matt,
> 
> VRRM - Reverse Recovery Voltage Maximum; maximum repetitive reverse
> voltage a diode or SCR  can survive.  Design robustness dictates derating
> from this value (50% is common).
> 
> Regards
> Dave Sharpe, TCBOR
> Chesterfield, VA. USA
> 
> Tesla list wrote:
> 
>> Original poster: "Matthew Smith by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>
>> 
>> Hi Terry, All
>> 
>> I checked the Farnell catalogue for IGBT prices and after the medical
>> team had resuscitated me... :-)  Yes, they are pretty expensive, but
>> definitely ones to watch (whilst the price falls); I *like* the idea of
>> the fibre optic (total electrical isolation) linkage between modules; I
>> also like the idea of getting more of the input power into the T-coil
>> rather than providing a sound and light show from the spark gap.
>> 
>> Think I'll go to the LV-fed FET idea (a la Carl Willis) for now, but
>> once those IGBT's are within reach of my pockets, look out world!
>> 
>> A final question whilst we're on the semiconductor subject:  My
>> catalogue rates diodes with a voltage RRM - what is this?  I was always
>> taught that diodes were rated as a *peak* voltage, so when sizing a
>> rectifier, we take the measured output voltage of the transformer and
>> divide by 0.707 (or was it 0.704) to get the peak from the voltage (RMS)
>> that we have measured...
>> 
>> Cheers
>> 
>> Matthew Smith
>> 
>> Tesla list wrote:
>>> 
>>> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>>> 
>>> Hi Matthew,
>>> 
>>> It certainly is possible!  I did a lot of work in this area a while back:
>>> 
>> 
>> 8x----- SNIP
>> 
>>> 
>>> Unfortunately, it is very expensive.  I estimated about $2000 on top of any
>>> R&D setbacks.
>> 
>> 8x----- SNIP
>> 
>>> 
>>> Cheers,
>>> 
>>> Terry
>>> 
>>> At 10:25 AM 12/23/2001 +1030, you wrote:
>>>> Hi all
>>>> 
>>>> Looking at various SSTC schematics, I see that we are generally
>>>> switching about 120V; is it possible to use a stack of MOSFETs, or
>>>> whatever, to work with a larger power source, eg., rectified MOT, to
>>>> build an SSTC with a lot more "oomph"?
>>>> 
>>>> Cheers
>>>> 
>>>> Matthew Smith
> 
> 
>