Re: need help igbts welder

On 30 May 2006 20:50:59 -0700, kidkv <ZACKSELE@xxxxxxx> wrote:
kidkv wrote:
i have 4 and only need to use two of them and they take 400amps for 1ms
note my welder gos to 225A and the one i got this from does weld with
it hears what he sad from his web site (Just for interest the devices
used in the Alpa test version of the unit were IRG4PC40F (600v 27amp,
these will handle 49 amps in pulsed mode ! 4 pieces were parralleled
for each section of the H bridge.
I later switched to a higher current device G30N60B3D which is good for
600v 60amp (220amp pulsed). Also used was an ultra fast switching diode
to protect the device junctions part number: MUR1540 (600v 15a) ) so
should i take out something or chang out something ???

witch capacitors would br best in it?????


I would suggest Cornell Dubilier snubbing capacitors, like their
series 943.

i

.