On Sep 17, 7:20*am, Karl Townsend
wrote:
I'm looking to rectify 240 VAC into DC with 100 amp surge capacity.
This will power the servo amps on my Matsuura bedmill. I probably
won't ask as many questions as Iggy about my winter projectVBG

The largest I found is 50 amp:http://www.digikey.com/scripts/DkSea...l&name=641-138...

Do I need to come up with some way to put three in parallel? If I do
this do I need to fuse each rectifier?

If a 100 amp unit is out there, my life would be simpler.

Karl

Rectifier size isn't your only problem here, you're going to have to
have a wonking big cap or two and a suitable inductor, too, for
filtering. Diodes CAN be paralleled, the usual thing was to add
resistance in line with each, for 100 amps, that's going to be a
pretty good sized resistor(physically). Better to use discrete stud
or press-mount parts of the proper ampacity. If you could come up
with a center-tapped transformer, you'd only need two to get full-wave
rectification. That would also get you proper isolation from the
line.

Better still, cast around on the surplus market for a power supply
already built. Herbach and Rademan and Surplus Center might have
such, there are other places. With the economic down-turn, there's
got to be a bunch of that stuff out there.

Stan