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RE: Skip's DRSSTC

Original poster: "Jason Judd" <JJudd@xxxxxxxxxxxxxxxx>

Hi Skip,

I am using the slightly bigger IRG4PF50WD IGBTs and get 50" + with 340V
DC and about 300 amps and my secondary is 21.5" x 6. If I was game to
wind up the wick a bit I think 60" would be no problem for say 400 amps.
I'd bet your IGBTs could go there too, but everything must be 100%.

I aggree fully with steve, you must have diodes between the IGBT
collector and emiters.

Jason.

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Friday, 30 September 2005 10:25 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: Skip's DRSSTC
>
> Original poster: Skip Greiner <sgreiner@xxxxxxxxx>
>
> Hi Steve
> Don't forget I am using IRG4PC40W IGBTs, not HGT1N40N60A
> IGBTs. Do you really think 58" is possible? If so how much dc
> will I need on the collectors to get to 58" ? I believe that
> I am running k at about
> .24 right now. I am afraid to go much higher.Also the
> decoupling caps are not across the IGBTs.
> Skip
>
> Tesla list wrote:
>
> >Original poster: Steve Ward <steve.ward@xxxxxxxxx>
> >
> >Hi Skip
> >
> >I do have the TVSs and decoupling caps on each IGBT. I guess that is
> >why they are still alive.
> >
> >
> >
> >You dont really have capacitors across *each* IGBT do you?
> That would
> >be terribly lossy as the caps would discharge through the IGBTs each
> >time they turned on.
> >
> >Maybe you dont understand, but you really *must* use the
> reverse diodes
> >on the IGBTs!
> >
> >"Don't forget, the secondary winding is only 18" tall."
> >
> >So that coil should be good to 58" sparks or so.
> >
> >Steve
> >
> >
> >
> >
>
>
>
>