PowerDsine IEEE802.3 - Manual (Page 10)

PowerDsine Presentation October 2005 Page 10
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HP POE Power Architecture-AC Input
„ Taken at account the voltage drop on a high current battery cable
and PSE voltage drop (Mosfet and CS resistor), it would require
Low Voltage Disconnect to shutdown battery at ~46V in order to
have 44V on the PSE output
„ It means battery life would not be fully utilize
„ Adding boost converter, which would keep output voltage of the
system constant, in our case 51V,would extend batteries
capabilities on ~15% in POE systems