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PowerDsine IEEE802.3 manual PoEp Power Architecture-AC UPS

Models: IEEE802.3

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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.

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PowerDsine Presentation

October 2005

Page 12

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PowerDsine IEEE802.3 manual PoEp Power Architecture-AC UPS

Contents

Vancouver BC, November IEEE802.3at Task ForceArkadiy Peker Daniel Feldman Yair Darshan Part A Technical Considerations regarding PoEp output voltage rangeObjectives PowerDsine Presentation„ To discuss optimum voltage range for PoEp „ To show advantages of having PoEp minimum voltage ofHP POE voltage range PoEp minimum voltage Power dissipationMaximum power 3.06WPd power Power dissipationPSE power PoEp minimum voltage„ Let consider different options in PoEp Power architectures AC input and battery back up AC UPS inputPowerDsine Presentation PoEp minimum voltagePoEp Power Architecture-AC Input PowerDsine PresentationOctober 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 PoEp Power Architecture-AC UPS PowerDsine PresentationOctober 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 PSPoEp with Boost circuit POE PS BatteryPowerDsine Presentation Lb Db Qb RsPoEp with Add Power AC or BatteryAdd Power Circuit POE PS PowerDsine PresentationConclusions Part B Market considerations regarding 802.3at output voltage range„ 802.3af minimum PSE voltage „ Modular switches 802.3af modular installed base considerationsPowerDsine Presentation OctoberHow to solve the conflict „ The Conflict isPowerDsine Presentation OctoberHow to solve the conflict - PD side „ Proposed SolutionHow to solve the conflict - PSE side „ Effects on PSE specifications PoEp PSE minimum voltage isSummary Discussion PowerDsine PresentationOctober PageReferences PowerDsine PresentationOctober PageAnnex A Enhanced Classification table PowerDsine PresentationGroup B „ Example for group A and group B „ With Pmax=40W

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

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