> > Why not have a single (redundant) big 24VDC power supply for
> > all the boards instead of supplying them all 120VAC?
>
> Well, I would guess that this is a catch-22. This is a good idea,
> which could actually produce cheaper, high quality power. But this
> is non-standard. The logistics of creating a new case design, and power
> supply designs are more than most corporations are willing to stomach on
> something as cheap as electric power, and equipment that is going to be
> upgraded in 2 years anyway.
actually, -48VDC is used by telephone equipment, and I've heard you can get
industrial grade PC power supplies that run on 48V DC so that they can be
run directly off of telephone style batteries. This is done at some
internet providers.
>From an electrical standpoint, the standard switching power supply used in a
PC just takes the 115VAC, full wave rectifies it to 120VDC, then runs this
through a 400khz oscillator en route to the toroidal transformer. Theres no
real savings to be had from going all DC here.
-jrp
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