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1、Efficiency Improvements and otherDevelopments in ORv3 Power SolutionsEfficiency Improvements and other Developments in ORv3 Power SolutionsR&P(Rack&Power)Cihan Aydin,Sen.Electrical Engineer,Delta Energy SystemsHarry Soin,Senior Director,Advanced EnergyRACK&POWERContentShort Recap on ORv3 SpecsCihan
2、AydinNew Requirements?Performance Update.Harry SoinRectifier PLD Transition ChallengesRectifier Response AC TransitionBBU Transition ChallengesRACK&POWERShort Refresh on ORv3 SpecRectifier:Input voltagerange:180V-305VACOutput power:3000WOutput voltage:50V AC/48V BBUOutput current:60AHoldup time:20ms
3、Efficiency:97,5%pk/96,5%full loadCurrentshare:Active+Voltage DroopCommunication:I2C/MOD-BusSize:73mm x 40mm(1RU)x 520mm Shelf:6 Slots for PSU+1 Slot for IPMI/PMCOutput power:(N+1)=18000W/15000W usableOutput voltage:50V AC/48V BBUOutput current:300A nominalOutput connector:500A Barklip(BK500)Communic
4、ation:MODBus/Ethernet via PMCSize:21“x 48mm(1OU)x 787mmRACK&POWERPSU Efficiency 277VACPSU Load Step From 10%to 150%(6,67ms)Shelf Load Step From 10%to 150%PSU&BBU Load Step to 150%Load with TransitionThe Common Shelf hasa PMC andthethecurrent sharebusis not routedthroughboth shelves.Current sharingpe
5、rformance isstill withinspeclimitsCommon Shelf Current Sharing Performance ORv3 3KW Efficiency*Random selected units in DVT build meets peak and minimum efficiency across all line conditions*Data measurement co-relates with engineering and customer efficiency measure set-ups93.50%94.00%94.50%95.00%9
6、5.50%96.00%96.50%97.00%97.50%98.00%0%10%20%30%40%50%60%70%80%90%100%230VACPSU1PSU2PSU3PSU4PSU5PSU6Peak LimitMin Eff Limit93.50%94.50%95.50%96.50%97.50%98.50%0%10%20%30%40%50%60%70%80%90%100%277VACPSU1PSU2PSU3PSU4PSU5PSU6Peak LimitMin Eff LimitAEI Rectifier iTHD and PF UpdateiTHDPFLoadiTHD240VACiTHD2
7、77VACLimit5%7.779.2615%10%8.288.1915%15%6.867.9210%20%4.474.3110%30%3.083.485%40%2.793.105%100%2.252.575%LoadPF 240VACPF 277VACLimit5%0.88410.8077-10%0.96030.93110.9015%0.97960.96520.9520%0.98810.98200.9530%0.99540.99280.9840%0.99770.99610.98100%0.99940.99910.98Rectifier Response AC InterruptionHalf
8、 load 277VAC 20msec interruptionTested at 20msec AC interruption at half and full load,Re-rush current measured between 24-25A for both loading condition and was able to ride-through.Full load 277VAC 20msec interruptionWell-controlled Inrush current allows right selection of circuit breakers,and eli
9、minates nuisance breaker trips due to uncontrolled inrush.Rectifier Response AC InterruptionBulk energy will be depleted more on heavier load/longer interruption time,but peak current would be the same until targetbulk level is reachedHalf loadFull LoadIn any AC line angle or output transient load,t
10、he inrush current is still controlled and sinusoidalORV3 Rectifier to BBU Transitions For the load to transition or share from rectifier to BBU seamlessly,rectifier regulation would drop by 3V and maintain that level at minimum 6 msec to trigger BBU to turn on and time to share.There are two main co
11、nditions for rectifier to adjust from 51V to 48V:Condition 1:During AC loss conditions Output will adjust if 50%of bulk energy is depletedCondition 2:Over power/current conditions:Average power more than 3.3kW for 10sAverage power more than 3.6kW for 100msRepetitive pulse power more than the pulse p
12、ower envelope specified(up to 150%load)ORV3 Rectifier adjusts from 51V to 48V AC Loss 150%load To meet minimum 6msec,the bulk energy depleted trigger was set from 66.6%down to 50%(30J).This remaining energy can sustain output at 48V for at least 6msec with 150%load.(note:specs is actually minimum 5.
13、7msec for this condition)CH1:Vout;CH3:VAC;CH4:IoutRemaining time 48V measured at 6.75msecAEI Rectifier Challenges(PLD transitions)Condition:PLD interruption for 25msec with 6 PSU in parallel no BBU.Problem:In this condition,AEI PSUs may shutdown due to AC loss or due to output fault.If shutdown due
14、to AC loss,the recovery time of PSU is Ton_Max_noBBU timing which is maximum 4sec to be able to power.While output fault recovery is 5sec.This will create non-synchronous power up during PLD.Fix:Update specs of Ton_Max_noBBU from 1sec wait after max random time to 3sec wait after max random time.AEI
15、 Rectifier Challenges(PLD transitions)No fix(wait period no BBU set at 1sec)Ch1:Vout;Ch2:Ishare;Ch3:SYNC_start;Ch4:ACAEI Rectifier Challenges(PLD transitions)With wait period adjusted to 3secCh1:Vout;Ch2:Ishare;Ch3:SYNC_startPerformance UpdateRectifier PLD transition challengesBBU Transition challen
16、gesAEI Rectifier Challenges(PLD transitions)With wait period adjusted to 3secCh1:Vout;Ch2:Ishare;Ch3:SYNC_startPerformance UpdateRectifier PLD transition challengesBBU Transition challenges https:/www.opencompute.org/products Project Wiki with latest specification:http:/www.opencompute.org/wiki/Server/Mezz Mailing list:http:/lists.opencompute.org/mailman/listinfo/opencompute-mezz-cardFind More InformationOpen Discussion