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PowerDsine Presentation October 2005 Page 9
www.PowerDsine.com
PoEp Power Architecture-AC Input
One of the arguments for not using 51V power supply is that back up
battery operates up to ~ 43 - 44V.
However most batteries used in telecommunication have one of the
terminal grounded (mostly positive)
This would prevent direct use of this batteries in POE and would
require to have isolated converter between batteries and PSE
regardless
of output voltage considerations
Therefore increasing output voltage to ~51V would not add any
system cost
But boost converter would be useful even in case of isolated
batteries (DC UPS), which really is not very popular power
architecture.