[plug] re: ups

[McMeikan, Andrew]

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There are some severe difficulties with this, but nothing that can't be
solved with lots of money.

Cost, that's why.  You can get them but they cost a lot.  If you really
want to do this you could do it by having a big 12v supply running from
mains feeding a 12v input PSU (design on my website
http://www.opendesign.cx ), with a decent size battery, you need never
reboot again.

The reason against a dual supply is that the switching transformer would
need to be different for such a variation in supply voltage.

	cya,	Andrew...

- -----Original Message-----
From:	Alan Howard [SMTP:alanh at wn.com.au]
Sent:	Tuesday, November 07, 2000 6:06 PM
To:	plug at plug.linux.org.au
Subject:	[plug] re: ups

why is it that a power supply isn't made that allows both 240v and 12v
opperation with auto switching and signaling to a serial port. it would
not be
very difficult to design as the computer power supply is already a switch
mode
type and modifying it to use both voltages is fairly straight forward. The
same
also goes for the monitors power supply. This would make for more
efficient
opperation as the power does not need to be converted to 240v then back to
12v,
5v, etc

regards
Alan Howard

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