Path: utzoo!utgpu!watserv1!maytag!xenitec!lemsys!clemon
From: clemon@lemsys.UUCP (Craig Lemon)
Newsgroups: comp.sys.amiga.hardware
Subject: UnInterruptable Power Supply
Message-Id: <02284.AA02284@lemsys.UUCP>
Date: Fri Sep 07 17:31:47 1990
Followup-To: comp.sys.amiga.hardware
Expires: 
Keywords: power supply
Distribution: world


        In a way, this post belongs in comp.sys.amiga.electronics-gurus. 
Since we don't have one, I'll settle for here.   I've been planning on
making a backup power supply for my Amiga 2000.  I have a fair amount of
expansion so my power requirements are not light.  I might say that I run a
little over 150 out of 200 watts (although I haven't added it up).  The
simplest system I first thought of is to eliminate the worry about
switching by always running power throught the DC/AC converter.  Assuming I
use a car battery as my battery, this means that the battery would always
be on charge (trickle) and the charger would then supply all power for the
computer when it's on.  When the power goes off, the charger is simply
offline and the battery continues to run the computer.

        As I said earlier, I use a fair bit of power so the DC/AC convertor
would have to be built to rediculous specifications.  I circuit would have
to alternate about 20 to 30 amps (depending on what is on) at 60 Hz and
then step it up with a transformer.  I then though of tapping into the DC
side of the power supply ONLY WHEN AC ISN'T ON, somehow.  This would let me
feed in 12VDC straight.  The power supply SHOULD (this is one of my
questions) have regulators to ensure proper voltage.  (I would try to apply
this power before the system regulators).  I would then only have to build
an AC convertor to power my monitor.

        I'm looking for suggestions for different ways to wire this system,
information on the workings of the power supply, any success and failure
stories, which design is most practical, fast ways of switching (if I have
to), would a capacitor in the computer cover-up switching time (I assume a
very large one would, and any other general suggestions.

        Thanks in advance...


--
--
 Craig Lemon - Kitchener, Ontario. Amiga B2000/10--2400 bps--AmigaUUCP 1.03D
 lemsys!clemon@xenitec.on.ca  or  ....!{uunet}!watmath!xenitec!lemsys!clemon