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- HELP with flash quenching IGBT/MOSFET
December 19, 2005, 1:31 am
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Need help in finding an appropriate MOSFET/IGBT to pulse my hi energy flash
I currently have a 100Ws rated flash lamp running at 330V / 1620uF (88Ws)
I'm want to do pre-flash followed by the main flash so I decided to use a
MOSFET to drive the trigger transformer and pulse shapping directly.
I've been using a MOSFET with ratings of 500V and 48A continuous/192A
pulsed. However, these MOSFETS have been dying on me after around 100
flashes... I did a current test flash pulse on them and found that it drew
about 70A peak with a pulse duration of around 15ms.
Is my MOSFET rated correctly???
If not, what rated MOSFET should I use??
What's the difference between an IGBT and MOSFET? I also used an IGBT (rated
for 85A continuous ) in place of the MOSFET and it failed to trigger with a
logic signal directly from the microcontroller (5V). I then tried to
manually trigger the IGBT with a 7V source and it only flashed once -
assumed I blew the IGBT... what am I doing wrong?
Re: HELP with flash quenching IGBT/MOSFET
** Is that an IXFK48N50 at circa $75 each ??
** A bigger one.
** Oh dear.........
** Oh deary me ........
( This reminds me of the story of Microfarad and Millihenry. )