1 Copyright © 2013 NTT DATA INTELLILINK Corporation

Green Consulting Business Unit Solution Business Division

NTT DATA INTELLILINK Corp.

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

2 Copyright © 2013 NTT DATA INTELLILINK Corporation

Power Grid Transformer UPS PDU ITE ( e.g. Server )

Problems facing data centers: Energy efficiency

DC AC DC AC

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.

Energy ( Power ) Loss

More heat, more cooling

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Most electric appliances have an internal power supply converting AC to DC. Why not directly feed them DC power?

Power Supply

ＤＣ ＡＣ

Power Supply

ＤＣ ＡＣ

Power Supply

ＤＣ ＡＣ

Power Supply

ＤＣ ＡＣ

Inverter

HF ＤＣ ＡＣ

IT equipment are fundamentally DC powered

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Trend: from UPS to DC+Battery

Battery

AC480V AC200V

SERVER RACK

DC12V

AC-SERVER Google AC DC

AC DC

MOTHER BOARD

Battery

MOTHER BOARD

DC12V-SERVER SERVER RACK

Microsoft AC DC

DC12V

AC DC DC48V

MOTHER BOARD

DC DC AC・DC48V-SERVER SERVER RACK

Battery RACK Battery

Facebook

AC DC DC12V

AC DC DC48V

MOTHER BOARD

DC DC SERVER RACK

Battery RACK Battery

Facebook DC12V-SERVER Open Compute project Open Rack Hardware v1.0 V1 Power shelf

AC DC DC12V MOTHER

BOARD

SERVER RACK

Battery Facebook DC12V-SERVER

Open Compute project Open Rack Hardware v1.0 V2 Power shelf

DC12V

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Power Grid Transformer PS Rack PDU Server Rack

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 XECHNO Power

DC 12V DC 340V AC

Central Redundant Power Supply

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Safety Traditional HVDC pain points have been removed

Server Rack

Battery

PS Rack

DC AC ～

PDU

HVDC

AC DC12V Mother Board CPU Memory HDD

Server（DC12V）

Key Technology : Middle Point Ground Key Technology : Bus Bar

DC HVDC

DC340V DC340V

Key Technology : Arc Suppression Circuit

Current is limited within safety limit for

W/O Suppression Circuit

W/ Suppression Circuit

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

Central Redundant Power Supply

Less chance of fire

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Reliability: redundancy

DC/DC 2kW

Central Redundant Power Supply

DC/DC 2kW

DC/DC 2kW

Server Rack 4kW

Rectifier Rack ITE ( DC Server )

DC12V

Backup Backup

Input

PDU

Non-stop maintenance and expansion through N+1,2 redundancy

Failure

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA

RF Unit 20kVA Failure

ITE ( DC Server )

ITE ( DC Server )

ITE ( DC Server )

ITE ( DC Server )

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Reliability: fewer failure points

ＡＣ ＤＣ ＡＣ ＡＣ Ｉｎ

ＤＣ

Battery

Switch

UPS

ＤＣ ＡＣ Mother Board

AC ITE ( Server )

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ＤＣ ＡＣ ＡＣ Ｉｎ

Battery HVDC

Mother Board

DC12V ITE ( Server )

Path-Through ＤＣ ＤＣ

Non-Voltage Flicker, Non-Stop, Non-

Interruptible Power through N+1 Redundant

Operation

Failure Point

Natural flow like a River

Failure Point

Failure Point

Failure Point Failure Point

Non-Voltage Flicker, Non-Stop, Non-

Interruptible Power through N+1 Redundant

Operation

Simpler architecture = less component count and failure points.

HVDC + DC12V

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Pass-through box

A drop-in replacement for AC/DC power supply of conventional ITEs

Only some protection circuitry No fan No liquid capacitor No need for certification Lots of space to add value

Battery Sensors ... and more

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Combining DC sources: HVDC + Solar + Battery

DC

AC

DC

DC

Power Loss Reduction : 5 % - 10%

HVDC + Solar

HVDC Power Company

Power Company

Power Conditioner

Existing Solar Power Generation

Data Center

Data Center

Simple & Direct

No need for power conditioner (no MPPT)

Locally generate & consume

Our testbed

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In service, March 2013 19 racks, 160 kW

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

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Conventional ITE ( DC12V ) Open Compute ITE ( DC12V )

For greater ecosystem of HVDC

-through box. What can we do to support Open Compute compliant equipment?

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Discussion Points

DC/DC

Bus Bar

ITE

AC/DC - -DC conversion for Facebook data centers (or Colo sites adopting OC servers)? Can we collaborate?

Input voltage fluctuation tolerance: Can we standardize on it? Open Compute mobo: 12.5 Vdc within 10.8 13.2 range Conventional 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?

(Bus bar-midplane connectors: Simply a choice of which physical shape?)

(Any issues?)

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Copyright © 2011 NTT DATA Corporation

Copyright © 2013 NTT DATA INTELLILINK Corporation

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