Re: SSTC, what to build!

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

Original poster: "Kreso Bukvic" <kreso.bukvic-at-kc.htnet.hr> 

This happens at micro SSTc with TL494 i didnt have ay problem. I didnot use
IC-s i used transistors to drive GDT.

Best Regards

Kreso bukvic
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, November 19, 2004 12:17 AM
Subject: Re: SSTC, what to build!


 > Original poster: biomed-at-miseri.winnipeg.mb.ca
 >
 >
 > Sounds like you might be getting shoot though on your bridge.  Shoot
though
 > where two MOSFETs are conducting on one leg of your bridge causing a short
 > across the supply and an over current condition of you FETS.
 >
 > Try running the driver board with no load and the 100W light bulb limiting
 > the current to the bridge.  If it lights up at all, you've got that
 > problem,  bridge shoot though or a bad MOSFET.
 >
 > Are you running your TL494 with pins 9 and 10 shorted together and using
an
 > inverting and non inverting gate driver chips or pins 9 and 10 separate.
 > In the second case( configuration)  there is some delay added to the
 > signals to prevent shoot though.
 >
 > Good luck,
 >
 > Shaun Epp
 >
 >
 > --- Tesla list <tesla-at-pupman-dot-com> wrote:
 >
 >   > Original poster: "Kreso Bukvic"
 >   > <kreso.bukvic-at-kc.htnet.hr>
 >   >
 >   > It was very wierd. It worked ok when i limited it
 >   > with a 100 W lightbulb. As
 >   > soon i remowed the lightbulb the fets exploded. I
 >   > tried even with 30 primary
 >   > turns and no luck. Maybe because i didnt have proper
 >   > GDT cores then...
 >   >
 >   > What is a maximal spark that could be expected with
 >   > a halfbridge with
 >   > IRFP460 (500 V 20 A).
 >   >
 >   > With TL494 and halfbridge of IRFP450 (500 V 10 A) i
 >   > got ~ 25 cm with alot
 >   > heating in the bridge in CW mode :)
 >   >
 >   >
 >   >
 >
 >
 >
 >