Re: [TCML] SISG Technology

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Bert,

I saw the date but didn't go as far as to correlate with Terry's SISG. 
Ran across the patent looking for thyristors. When I read it, I was 
amazed how similar this sounded to the SISG topology. But then, I've 
seen in my job patent infringement taking place (other companies 
literally copying our design) and I am sort of amazed at how much this 
really does occur which makes me sensitive to the possibility. The SISG 
is really a topology which should be patented by Terry, but usually that 
entails a product to market to pay for patent attorneys and all that fun 
stuff.

Take care,
Bart

Bert Hickman wrote:
> 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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