[rescue] adding power redundancy to single power supply systems ?

der Mouse mouse at Rodents.Montreal.QC.CA
Mon Mar 24 10:39:44 CDT 2008

> Did some searching... does anyone make a 'power strip' that takes two
> AC feeds, has some relays/capacitor magic/etc and can flop between a
> primary AC feed and a secondary AC feed to make single power supply
> systems take advantage of multiple colocation power feeds ?

Unless what it's feeding is pretty tolerant, you'll need to cut over
fast in case of failure on one feed.  Electromech relays might prove to
be too slow.

It's not quite what you're asking for, but, provided it's feeding
something that can eat high-ripple unregulated DC (like, a switching
power supply), you can get pretty much the same effect with nothing
more than a bunch of diodes - and, you get zero cutover time. :)

Of course, whether that's any help depends on, among other things,
whether an "a bunch of diodes" one-off is acceptable under the

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