Powerdsine IEEE802.3 Manuel d'utilisateur télécharger pdf (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

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