Your best bet is to provide some sort of battery backup, so if main power
goes there is some juice to enable an orderly shutdown. A few NiCD or NiMH
cells and a small Switchmode regulator should do. The machine can monitor
the state of the main power line and shut down properly when it drops.
My power supply is roughly like this
---------------------------------------> potential divider
+8 to +18v | and monitor point
+ power 1 -----|>------|
|------[ SMPS ]-------> +5v
+ power 2 -----|>------| 1A module
diodes
If I disable the s/w monitor for the power line, this also means I can
move the box around with a battery pack, and connect up to the mains power
pack, then remove the battery pack etc without any outage. I've had the
box up for over a month of running, in the field and on the bench swapping
between various battery supplies and mains. Backup Power supplies are a
doddle when you have low powered equipment like this.
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