SV: RE: [sdiy] Multiple Voltage Power Supply / design problem!

[John Luciani]

On 5/16/07, Roy J. Tellason <rtellason at verizon.net> wrote:
> On Wednesday 16 May 2007 13:27, Colin Hinz wrote:
> >  On Tue May 15 23:31 , "Roy J. Tellason"  sent:
> > >I had *one* UPS that wanted a total of _ten_ small batteries for
> > > replacement, as compared with typically one or two in the rest of the
> > > ones that I've encountered.
> > >
> > >Too bad I can't seem to find any switchers which will accept a
> > > lower-voltage DC input.
> >
> > Roy,
> >
> > "Lower-voltage" means how low? And what sort of outputs are you needing.
>
> No immediate needs,  instability of circumstances here precludes me getting
> much going in the way of construction projects,  but it'd be neat to be able
> to run things off 12V batteries or automotive power in general.
>
> Instead most of the switchers I run across seem to want line voltage or double
> that.

Vicor (www.vicr.com) has a wide range of DC-DC converters. For a 12V
input your options are limited to VI-20x or VI-2Vx series devices. If
you can wire your
batteries to get to the telecom range (48V) there are a wide range of options
including their 3rd generation of converters (V*I Chips) with
efficiencies above 90% and a
a power processing capability of 1000W/in^3.

For low power designs where size is not crtical the Vicor converters
can be expensive. For
high power or dense layouts Vicor offers an excellent solution.

(* jcl *)

-- 
http://www.luciani.org