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PowerDsine IEEE802.3 manual

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Table of contents for the manual

  • Page 1

    www.pow erdsine.com IEEE802.3at Task Force Technical and market considerations regarding PoEp output voltage range Vancouver BC, November 2005 Arkadiy Peker Daniel Feldman Yair Darshan[...]

  • Page 2

    www.pow erdsine.com Part A Technical Considerations regarding PoEp output voltage range[...]

  • Page 3

    PowerDsine Present ation October 2005 Page 3 www.Power Dsin e.com Objectives  To discuss optimum voltage range for PoEp  To show advantages of having PoEp minimum voltage of 51V[...]

  • Page 4

    PowerDsine Present ation October 2005 Page 4 www.Power Dsin e.com HP POE voltage range  Maximum voltage: 57V (safety consideration)  What is most optimum value for minimum voltage?  PoEp group objective; maximum power within practical limit (Power Dissipation, Safety consideration)  Power dissipation is function of the current  Incre[...]

  • Page 5

    PowerDsine Present ation October 2005 Page 5 www.Power Dsin e.com PoEp minimum voltage  Lets assume current is 0.35A and calculate power delivered to the load by four pairs  It means, that at 51V, for the same power dissipation on the cable, power delivered to the load will be 4.9W more then at 44V.  The advantage of higher voltage is fu r[...]

  • Page 6

    PowerDsine Present ation October 2005 Page 6 www.Power Dsin e.com PoEp minimum voltage  Let us look on this issue under anot her angle assume minimum load need to be delivered to PD by four pair is 40W  Power dissipation on a cables for 51V PSE will be 2.45W less then for 44V  Advantages of higher voltage is in crease with increasing power[...]

  • Page 7

    PowerDsine Present ation October 2005 Page 7 www.Power Dsin e.com PoEp minimum voltage  51V required smaller PSE power supp ly then at 44V, for the same load.  The technical advantage is clear for using higher voltage minimum voltage level for POEp PSE.  Let consider different options in PoEp Power architectures : - AC input and battery ba[...]

  • Page 8

    PowerDsine Present ation October 2005 Page 8 www.Power Dsin e.com PoEp Power Architecture-AC Input[...]

  • Page 9

    PowerDsine Present ation October 2005 Page 9 www.Power Dsin e.com PoEp Power Architecture-AC Input  One of the arguments for not using 51V power supply is that back up battery operates up to ~ 43 - 44V.  However most batteries used in telecommunication have one of the terminal grounded (mostly positive)  This would prevent direct use of th[...]

  • Page 10

    PowerDsine Present ation October 2005 Page 10 www.Power Dsin e.com 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 lif[...]

  • Page 11

    PowerDsine Present ation October 2005 Page 11 www.Power Dsin e.com PoEp Power Architecture-AC UPS[...]

  • Page 12

    PowerDsine Present ation October 2005 Page 12 www.Power Dsin e.com 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 4[...]

  • Page 13

    PowerDsine Present ation October 2005 Page 13 www.Power Dsin e.com PoEp with Boost circuit Battery AC POE PS PWM Rs Lb Qb Db Cb R1 R2[...]

  • Page 14

    PowerDsine Present ation October 2005 Page 14 www.Power Dsin e.com PoEp with Add Power Add Power Circuit AC or Battery POE PS + - + - V<51V + - Vout 51V •For 48V 250W power supply, ma ximum 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 effic iency, total co[...]

  • Page 15

    PowerDsine Present ation October 2005 Page 15 www.Power Dsin e.com Conclusions  Increasing minimum PoEp volta ge from 44V to 51V would increase overall system efficiency  Costs of 51V PS and 48V PS are approximately the same and from technical point of view w ould be beneficial to have minimum 51V in PoEp PSE  Regardless of output voltage [...]

  • Page 16

    www.pow erdsine.com Part B Market considerations regarding 802.3at output voltage range[...]

  • Page 17

    PowerDsine Present ation October 2005 Page 17 www.Power Dsin e.com 802.3af modular installed base considerations  802.3af minimum PSE voltage: 44V  Modular switches – 44V power supply is deployed with chassis – Customer expectation: 802.3at-b lades added to 802.3af-chassis – 51V minimum at PSE Æ Boost converter MUST be placed on blade [...]

  • Page 18

    PowerDsine Present ation October 2005 Page 18 www.Power Dsin e.com How to solve the conflict  The Conflict is: – 51V is the Technically pre ferred solution  More power at low cost  Bigger addressable market – 44V addresses the existing modular installed base  Impossible to replaced 44V power supplies on the field[...]

  • Page 19

    PowerDsine Present ation October 2005 Page 19 www.Power Dsin e.com How to solve the conflict – PD side  Proposed Solution  Effects on PD specifications – PD operating voltage range: No effect. Remains 37-57V. – PD classification in 802.3at (including Class 4) should be mandatory and not optional – The enhanced classification table wil[...]

  • Page 20

    PowerDsine Present ation October 2005 Page 20 www.Power Dsin e.com How to solve the conflict – PSE side  Effects on PSE specifications – PoEp PSE minimum voltage is 51V. – However PSE's that have a 44V minimum output and are 802.3at- complaint in any other aspect, are anyway able to power 802.3at- complaint PD's with classes of P[...]

  • Page 21

    PowerDsine Present ation October 2005 Page 21 www.Power Dsin e.com Summary  The conflict level is pretty much reduce by the previous recommendations  Compliant 802.3at PSE is the one with 51V minimum  Physics allow to support most of the higher power classed even with 44V ((enhanced classification part A group). which is built in benefit h[...]

  • Page 22

    PowerDsine Present ation October 2005 Page 22 www.Power Dsin e.com Discussion[...]

  • Page 23

    PowerDsine Present ation October 2005 Page 23 www.Power Dsin e.com References  An Extended Classifi cat ion Proposal-Proposal #1 . Yair Darshan, Vancouver BC, November 2005[...]

  • Page 24

    PowerDsine Present ation October 2005 Page 24 www.Power Dsin e.com Annex A: Enhanced Classification table  Example for group A and group B  With Pmax=40W Group B[...]