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PowerDsine IEEE802.3 PoEp with Add Power, V51V, Vout, AC or Battery, Add Power Circuit POE PS

Models: IEEE802.3

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PoEp with Add Power

AC or Battery

Add Power

Circuit

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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PowerDsine Presentation

October 2005

Page 14

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PowerDsine IEEE802.3 PoEp with Add Power, V51V, Vout, AC or Battery, Add Power Circuit POE PS, PowerDsine Presentation

Contents

Arkadiy Peker Daniel Feldman Yair Darshan Vancouver BC, NovemberIEEE802.3at Task Force Part A Technical Considerations regarding PoEp output voltage range„ To discuss optimum voltage range for PoEp ObjectivesPowerDsine Presentation „ To show advantages of having PoEp minimum voltage ofHP POE voltage range Maximum power PoEp minimum voltagePower dissipation 3.06WPSE power Pd powerPower dissipation PoEp minimum voltagePowerDsine Presentation „ Let consider different options in PoEp Power architecturesAC input and battery back up AC UPS input PoEp minimum voltageOctober PoEp Power Architecture-AC InputPowerDsine Presentation PagePoEp Power Architecture-AC Input „ One of the arguments for not using 51V power supply is that back up battery operates up to ~ 43HP POE Power Architecture-AC Input October PoEp Power Architecture-AC UPSPowerDsine Presentation PagePoEp 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 PSPowerDsine Presentation PoEp with Boost circuitPOE PS Battery Lb Db Qb RsAdd Power Circuit POE PS PoEp with Add PowerAC or Battery PowerDsine PresentationConclusions Part B Market considerations regarding 802.3at output voltage rangePowerDsine Presentation „ 802.3af minimum PSE voltage „ Modular switches802.3af modular installed base considerations OctoberPowerDsine Presentation How to solve the conflict„ The Conflict is OctoberHow to solve the conflict - PD side „ Proposed SolutionHow to solve the conflict - PSE side „ Effects on PSE specifications PoEp PSE minimum voltage isSummary October DiscussionPowerDsine Presentation PageOctober ReferencesPowerDsine Presentation PageGroup B Annex A Enhanced Classification tablePowerDsine Presentation „ Example for group A and group B „ With Pmax=40W