nuckolls.bob(at)aeroelect
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 Posted: Fri Nov 13, 2009 5:34 am Post subject: Preferred Method for Redundant Power Sources to Single Inp |
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At 07:09 AM 11/13/2009, you wrote:
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<gordonrsmith921(at)yahoo.com>
Bob wrote:
Obviously, a pair of diodes could be used WITHOUT switches to
provide an either/or energy path from two, always-on sources.
In this case when the two always-on sources differ by a volt or two,
for whatever reason, Do the sources provide power proportionally to
their voltage or will it be a 100% feed from the highest voltage source?
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Great question. The highest voltage source will assume
most if not all the total downstream load. The design goal
for use of diodes in this manner is not to spread and share
the load between two sources but to insure that the loads
are supplied with energy irrespective of the condition for
either source.
I'm working an accident case where a couple of systems were
combined downstream of a pair of diodes without modifying
upstream protection to accommodate the SUM OF BOTH LOADS
on EITHER energy source.
This was but one design error that stacked on top of several
others to bring an airplane full of folks to an unplanned
arrival with the earth. The little things DO matter.
Bob . . .
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