Re: [TCML] IGBT 1200V, 54A

[piranha <piranha@xxxxxxxxxx>]

It's 'money'!!

Everyone wants an SISG coil.  But they don't want to pay $1500 for it!!  
You can't find those old golden IGBTs in the trash can.  You have to go 
out and spend hard cash there.  And like all that solid state stuff, it 
can be gone in a puff of smoke!  Not a game for the feint of heart...

But electronically, it's 'voltage'.  If there were a 30kV single IGBT 
out there, it would be 'one' easy section.  Current (even when low) can 
be handled if we have the voltage.

So far, I think I am the only one to blow an SISG in an un-related 
experiment years ago.  Phil's primary strike is not there yet ;-)  But 
Finn and others have had zero problems with SISG silicon failures from 
what I have heard back.

After Phil's work, it seems like the IGBT heating might not be nearly as 
bad.  If they run very cool, we can spend far less money on the IGBT 
devices :D

Terry




Helen Lo wrote:
> Terry -
>    
>   As far as use in a SISG tank circuit, what IGBT parameter do you feel is the limiting factor: voltage, or pulse current?
>    
>   Aside from damage from a primary strike, has anyone reported IBGT failure during "normal" operation?
>    
>   Regards,
>   Scott Hanson
>
> piranha <piranha@xxxxxxxxxx> wrote:
>   Possibly, but after Phil's testing the extra thermal mass may not be 
> needed. The OLD IGBT was the largest available because we did not know 
> any better. A much smaller IGBT may do perfectly fine.
>
> "Welcome back, Terry.
> Cheers, Finn hammer"
>
> I still lurk here and make comments when time permits ;-)
>
>
> Terry
>
>
> Jim Mora wrote:
>   
> > Hi Terry, Et Al,
> >
> > At such a cost differential, couldn't a design be made that doubles the IGBT
> > parts count (sorry, not my bailey wick)?
> >
> > Jim Mora
> >
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> > Of piranha
> > Sent: Saturday, April 12, 2008 3:28 PM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] IGBT 1200V, 54A
> >
> > It only has 1/2 the die area but at that price it is worth a try. It is 
> > not like the big ones are blowing up. IR is quoting $28.75 for the 
> > IRGPS60B120KDP these days!!
> >
> > Terry
> >
> >
> >
> > bartb wrote:
> >
> >     
> > > Hi All,
> > >
> > > I found a possible replacement for the IRGPS60B120KDP discrete (sisg 
> > > application).
> > >
> > > Fairchild's HGTG18N120BND looks similar and price is $8.67 ea at 
> > > Newark, $5.25 at Digikey, $5.20 at Mouser.
> > > http://www.fairchildsemi.com/ds/HG%2FHGTG18N120BND.pdf
> > >
> > > Take care,
> > > Bart
> > > _______________________________________________
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> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> > >
> > >
> > >       
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> >
> >
> >     
>
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>   

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