PowerDsine IEEE802.3 - Manual (Page 12)

PowerDsine Presentation October 2005 Page 12
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PoEp Power Architecture-AC UPS
„ Cost of power supply with 44V or 51V outputs is approximately the
same. But under the same conditions, 51V output power supply will
have higher efficiency then 44V PS
„ Estimated cost of additional boost circuitry for supporting the change
from 45V to 52V for 500W power supply is about 10% cost of power
supply.