HVDC Innovation,
XECHNO® Power & Fresh HVDC ®
Energy Saving Technology for the Data Center

Green Consulting Business Unit
Solution Business Division

NTT DATA INTELLILINK Corp.

Copyright © 2013 NTT DATA INTELLILINK Corporation1

Problems facing data centers: Energy efficiency
There are so many AC/DC and DC/AC converts in a data center.
Conversion causes power loss and dissipates heat, and requires more power to cool.
Power Grid

Transformer

UPS

PDU

ACDCACITE ( e.g. Server )DC

Energy ( Power ) LossMore heat, more cooling
Copyright © 2013 NTT DATA INTELLILINK Corporation2

IT equipment are fundamentally DC powered
Most electric appliances have an internal power supply converting AC to DC.
Why not directly feed them DC power?

Power Supply

ＡＣ

Power Supply

ＤＣＡＣPower Supply

ＡＣCopyright © 2013 NTT DATA INTELLILINK Corporation

ＤＣＤＣ

Power Supply

ＡＣ

ＤＣ

Inverter

ＡＣ

ＤＣ

HF

3

Trend: from UPS to DC+Battery
ĳ AC480V

ĳ AC200V

ACGoogle

AC

Microsoft

SERVER RACKAC

DCBattery

Battery

SERVER RACKMOTHER
BOARD

Battery

MOTHERBOARD

DC12V-SERVER

AC
DC

DC48V

DC12V

DC12V

DC

ĳ $&9ĳ$&9Facebook

AC-SERVERSERVER RACKĳ$&9DCDCDCDC12V
MOTHERBOARD

AC・DC48V-SERVER

Battery RACK
ĳ $&9ĳ$&9FacebookAC

DC

DC48V

Open Compute projectOpen Rack Hardware v1.0 V1 Power shelf
ĳ $&9ĳ$&9Facebook

Open Compute projectOpen Rack Hardware v1.0 V2 Power shelf
Copyright © 2013 NTT DATA INTELLILINK Corporation

AC
DC
Battery

DC12V

DCDC

SERVER RACKMOTHERBOARD

DC12V-SERVER

Battery RACKAC

DC

DC12V
DC12V-SERVER

MOTHER
BOARD

Battery

SERVER RACK4

Our proposition: HVDC and DC 12V ITEs
Our HVDC power system reduces AC/DC conversions between Grid and ITE.
Power loss is reduced approximately by 10-20%.
Fresh HVDC
Power GridTransformer

PS Rack

XECHNO PowerPDU

Server Rack

Central RedundantPower Supply

ACCopyright © 2013 NTT DATA INTELLILINK Corporation

DC 340V

DC 12V5Safety
Traditional HVDC pain points have been removed
AC〜PDU

PS Rack
AC DC

DC340V

DC340V

HVDC

HVDC

ServerRack
DC

Server（DC12V）
DC12V

Mother Board
MemoryHDD
CPUBattery
Central RedundantPower Supply

Key Technology : Middle Point Ground

Key Technology : Bus Bar

Key Technology :Arc Suppression Circuit
W/O Suppression
CircuitCurrent is limited within safety limit for
KXPDQWKURXJKKLJKUHVLVWRUVRI.ȍCopyright © 2013 NTT DATA INTELLILINK Corporation

W/ Suppression CircuitLesschance offire

Resolved the arc discharge issue at the time of switch-on/offand disconnection.

6

Reliability: redundancy
Non-stop maintenance and expansion through N+1,2 redundancy
Server Rack 4kW
Rectifier Rack

Input

ITE ( DC Server )RF Unit
Failure20kVA

RF Unit
20kVA

ITE ( DC Server )RF Unit
20kVA

RF Unit
20kVA

ITE ( DC Server )RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

RF Unit
20kVA

BackupCopyright © 2013 NTT DATA INTELLILINK Corporation

ITE ( DC Server )ITE ( DC Server )

DC12V

PDU

Central RedundantPower Supply
DC/DC2kW

FailureDC/DC2kW

DC/DC2kW

Backup7

Reliability: fewer failure points
Simpler architecture = less component count and failure points.
FailurePoint

Failure
Point

ＡＣ
Ｉｎ

ＡＣ

ＤＣＤＣ

FailurePoint
ＡＣ

FailureFailure
Point
Point

Switch

UPS

ＡＣ

ＤＣ

ＡＣ

ＤＣ

MotherBoard

AC ITE ( Server )Battery

HVDC + DC12VＡＣＩｎＡＣ

Non-Voltage Flicker,
Non-Stop, NonInterruptible Powerthrough N+1 RedundantOperation

Natural flow like a River

ＤＣBatteryCopyright © 2013 NTT DATA INTELLILINK Corporation

ＤＣＤＣHVDC
Non-Voltage Flicker,
Non-Stop, NonInterruptible Powerthrough N+1 RedundantOperation

PathThroughMotherBoard

DC12V ITE ( Server )8

Pass-through box
A drop-in replacement for AC/DC power supply of conventional ITEs
¾ Only some protection circuitry¾ No fan¾ No liquid capacitor¾ No need for certification¾ Lots of space to add value¾ Battery¾ Sensors¾ ... and more

Copyright © 2013 NTT DATA INTELLILINK Corporation

9Combining DC sources: HVDC + Solar + Battery
No need for power conditioner (no MPPT)

Locally generate & consume
Existing Solar
PowerGenerationPowerConditioner

DCACOur testbed

DataCenterPowerCompany

HVDC + Solar

Power LossReduction :5 % - 10%

Simple & Direct
DCPowerCompany
Copyright © 2013 NTT DATA INTELLILINK Corporation

HVDC

DCDataCenter10Production use: Ishikari DC, Sakura Internet Co. Ltd.

In service, March 2013
19 racks, 160 kW
Copyright © 2013 NTT DATA INTELLILINK Corporation

11For greater ecosystem of HVDC:HVXSSRUWFRQYHQWLRQDOHTXLSPHQWE\³HYDQJHOL]LQJ´SDVV-through box.

What can we do to support Open Compute compliant equipment?

Conventional ITE ( DC12V )Copyright © 2013 NTT DATA INTELLILINK Corporation

Open Compute ITE ( DC12V )12Discussion Points
AC/DCDC/DCBus Bar

ITE$Q\SODQIRUH[SHULPHQWLQJZLWK³XS-IURQW´$&-DC conversion for
Facebook data centers (or Colo sites adopting OC servers)?
Can we collaborate?
(Any issues?)(Bus bar-midplane connectors: Simply a choice of which physicalshape?)

Input voltage fluctuation tolerance: Can we standardize on it?
Open Compute mobo: 12.5 Vdc within 10.8 ± 13.2 rangeConventional mobo:
12.0 Vdc within 11.4 ± 13.2 range (5%)

Protection circuitry: Is there an Open Compute spec?
Can we eliminate redundancy if any?
Copyright © 2013 NTT DATA INTELLILINK Corporation

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Global IT Innovator

Copyright © 2011 NTT DATA Corporation

Copyright © 2013 NTT
DATA INTELLILINK
Copyright© 2013 NTTCorporation
DATA INTELLILINK Corporation

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