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From: "John Jardine"
Date: Mon, 16 Dec 2002 22:10:45 -0000
NNTP-Posting-Date: 16 Dec 2002 21:57:59 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
I've little idea of SMPS beyond a 200W DC step-up, so an AC-DC 2.5 to 3kW
step-down seems an out of reach, nightmare.
The more I look into it the more I seem either spoiled for choice, or have
no choice at all. I wonder if someone familiar with the black art of these
things can throw some crumbs off their table sufficient to allow me some
kind of compass direction to point at?.
The suggestion is for a piece of portable kit that will be powered from an
on-site 110Vac generator (95V-140V building site type!) and will give as o/p
(unsorted yet) 40-50V DC (say 55amps max). The power will be dumped into a
resistive heating element (one shot) for up to maybe 30 minutes a time.
Operating duty cycle about 60%. ('tool' rating).
The kit needs eventually engineering to a best cost, as it would be compared
to existing equipment using mains transformers
It also must make best use of the power available from crappy site
generators. So a 95% or better PF is wanted.
Safety 'galvanic' o/p isolation is needed but other than that all other
spec' aspects would be pretty slack.
Is there any 'optimum' PF pre-stabiliser topology or core(s)?.
Drive main step-down transformer via 1/2 bridge? or full bridge? something
Can any particular main transformer core(s) be recommended ?. (is the
amorphous metal-glass stuff regularly used nowadays?)
Any suggestions/best guesses/guidance would be much appreciated :-)
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