[time-nuts] Thunderbolt and UPS, Was any negatives ?
GandalfG8 at aol.com
GandalfG8 at aol.com
Mon Jun 1 17:18:14 UTC 2009
In a message dated 01/06/2009 18:03:02 GMT Daylight Time,
pete at petelancashire.com writes:
Anyone running with a power supply with built in UPS ?
A long time ago (>15yrs) I did project that for a supply did
a/c line -> battery -> +5/+12/-12. A side advantage was great
isolation.
-----------
Probably the easiest way to do that for the Tbolt would be to generate pos
and neg 12 volt supplies, either from a single or pair of transformers,
with the pos 5 volt derived from the pos 12, and also use the supplies to
trickle charge a couple of 12 volt sealed lead acid batteries.
It would be easy enough to calculate ratings based on required battery
running period and the battery on the neg 12 rail could be significantly lower
capacity than that on the positive supply.
regards
Nigel
GM8PZR
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