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RE: [TCML] SISG Technology
Hello Bert, et al,
I wonder if anyone on the list has experimented with this approach. My first
impression is that component costs would be higher? Triggering with fiber is
interesting...Thoughts?
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Bert Hickman
Sent: Thursday, February 05, 2009 6:54 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] SISG Technology
Hi Bart,
Nope - this guy didn't abscond with Terry's SISG design...
This particular patent (dated 2002) predates Terry's SISG work by about
4 years and, unlike Terry's approach it uses stacked high speed
thyristors as the main current carrying element, with optical
sensor/IGBT or pulse transformer triggering for each stage. The SISG is
kind of the reverse of this - it uses a thyristor to trigger IGBT power
switches. This proposal appears to be a pulsed power adaption of similar
optically or transformer isolated stacked thyristor circuits used for
the inverters in HVDC electrical power transmission systems. Specially
fabricated high di/dt thyristors were employed in this application for
faster turn on time. As with the SISG, diodes are used to conduct
reverse pulse current. You can see the full disclosure of the approach,
schematics, and test results here:
http://www.wipo.int/pctdb/images4/PATENTSCOPE/17/70/e9/0070e9.pdf
HOWEVER: I see no reason why stacked SISG-like circuits could not be
used for certain pulsed power applications, and it would not surprise me
to see SISG-like circuits applied to this arena...
Bert
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bartb wrote:
> Hi All,
>
> While doing a search for "high voltage solid state switch", I came
> across a patent of sorts.
> http://www.wipo.int/pctdb/en/wo.jsp?wo=2002084872
>
> The telling tale are the words in the abstract "multiple thyristors". Is
> this not the same as the SISG? "energy at the thyristors is the same as
> the switching circuit", etc.
>
> Seems to me this Steven Gliddon looked at Terry's design, saw an
> application for such a circuit, and ran with it as his own.
>
> I could just be paranoid also. But odd how similar this appears.
>
> Maybe Terry has finally reached Tesla status (others patenting his
> technology).
>
> I may be off here, but thought of Terry's SISG as soon as I read the
> abstract.
>
> Bart
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> http://www.pupman.com/mailman/listinfo/tesla
>
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