PowerDsine IEEE802.3 - Manual (Page 14)

PowerDsine Presentation October 2005 Page 14
www.PowerDsine.com
PoEp with Add Power
Add Power
Circuit
AC or Battery
POE PS
+
-
+
-
V<51V
+
-
Vout 51V
•For 48V 250W power supply, maximum power for add power converter
would be (52V-48V)*(500/48)=42W or about 9% of 500W PS cost
•However taken in account improved system efficiency, total cost of
ownership would remain about the same