Energy saving technology for data centers
HVDC（High Voltage Direct Current）＋ 12V Server rack system
Green Solution Business Unit
Environmental Technology Division

NTT DATA INTELLILINK Corporation

Copyright © 2013 NTT DATA INTELLILINK Corporation

Case study

Service In ! / Sakura Internet Ishikari DC■ System:
DC12V Type HVDC Power Supply System（Product: FRESH HVDC® and XECHNO® Power）■ Location: Ishikari DC of Sakura Internet■ Range: 19Racks 140kW

Copyright © 2013 NTT DATA INTELLILINK Corporation2

Configuration: XECHNO-Power and central power supply unit
Central power supply unit

Backside ofserver rack

Mount frame

Shelf（TJ1727）

Monitoring
device forcentral PS UNIT

power
Central Powersupply Unit
unit
SupplyPS Unit （TJ1715）

Parallel runningwith N+1 redundant
6 Unit Max hot-pluggable
PS Unit TJ1715（HVDC DC/DCConverter)

SNMP

Pass-throughbox

DC12
DC12V
V ITE
ITE

Minus cable
Plus cable

DC12V Central PS(DC/DC Converter)

Laminated busbar
Flexible busbar

Server Rack System (20－25 Racks / 1System)
Copyright © 2013 NTT DATA INTELLILINK Corporation

Flexible bus bar
Connected bus bar
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What HVDC DC12V type can do for You
Benefit１

HVDC DC12V can help you succeed in the future with greater
productivity and lower costs.

●Total Efficiency – higher than 90% with
reducing the number of conversion!
●High efficiency with real loading factor,unlike UPS●Intensive PS system with central power
supply unit in server rack
●Reduction of electricity charge

Benefit2●Non-stop maintenance and expansion through n+1
redundancy!
●Seamless connection to battery during power outage!
●Less AC conversion!
●Eliminating PS form ITE, long-lasting, highly-reliable!
Fanless, liquid-capacitor less!

Energy-saving effect High reliability
Safety The future technology●Solving high voltage-current problems !
・Arc suppression circuit
・Middle point ground・DC12VBenefit3
Copyright © 2013 NTT DATA INTELLILINK Corporation●Solar power●LED Illumination●Fuel cell
●Cooling system with outside air●Superconductors
etc…
Benefit44

Energy-saving effect: Energy reduction
HVDC DC12V Power Supply System reduces AC/DC conversions between commercial
power and ITE. Power loss is reduced by approximately 10-20%.

CPU/MEMORY/HDD

CPU/MEMORY/HDD

Copyright © 2013 NTT DATA INTELLILINK Corporation5

SafetyMultiple safety guard ！
AC～PDUPS rack
AC DC

DC340V

DC340V

HVDC

HVDC

Serverrack
DCServer（DC12V）
DC12V

Mother board
MemoryHDD
CPUBattery
Central RedundantPower Supply

Key technology : Middle point groundKey technology : Bus bar

The current is limited within safety current for humanthrough high resistors of 47KΩ.
Dangerousness by
the high voltage
had been pointedout. But ,,,Key technology :Arc suppression circuit
W/O Suppression
Circuit

W/ Suppression Circuit

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

Copyright © 2013 NTT DATA INTELLILINK Corporation

6The difference ＵＰＳ to HVDC-DC12V
DC380V SERVER
AC～UPSPDU

DC/ACPower supply（PWM Switching）（PWM Switching）

SwitchingPower supply（Isolation AC/DC）（PWM Switching）

AC

SwitchingPower supply（Isolation AC/DC）（PWM Switching）

Battery

AC～

UPS

PDU

DC/AC
Power supply（PWM Switching）（PWM Switching）

η=80～92%

AC

BatteryAC

Diode Rectifier（Non-Isolation）（Non-Switching）

～

DC12V

Conventional
DC200～400V

Non-stable power supply
DC340-380V～
AC

MotherBoard

PDU

η=9８～99%
PDU

n+1 redundant

Battery

DC12V
η=99.5%
SwitchingPower supply（Isolation DC/DC）（PWM Switching）n+1redundant

Pass-Through（W/Protection）

DC12V SERVER

MotherBoard

η=93～95%
Battery
Battery

Copyright © 2013 NTT DATA INTELLILINK Corporationn+1 redundant7

Energy-saving effect: Total efficiency of HVDC
comparative chart効率比較
of efficiency

Eff[%]
効率

difference差異

95.0 %

20.0 %
18.0 %

90.0 %

9.0%

85.0 %

8.4%

18.0%

16.0 %
14.0 %
12.0 %

80.0 %

10.0 %
75.0 %
70.0 %

総合効率

AC方式総合効率■ AC Type Total Efficiency

XECHNO+Fresh

総合効率■ Difference(%)

AC方式総合効率

8.0 %

XECHNO+Fresh Total Efficiency

6.0 %ACXECHNO+Fresh
Type Total Efficiency

4.0 %65.0 %XECHNO+Fresh■ XECHNO+Fresh Total Efficiency

差異 ( % )AC方式総合効率
Difference(%)
差異 ( % )2.0 %60.0 %

0.0 %
12.5%

25.0%

37.5%

50.0%

62.5%

75.0%

87.5%

100.0%

LoadFactor[%]
負荷率(%)

Copyright © 2012NTT DATA Corporation

8

Solar Power + HVDC
Drive The Future Communication withSunlight !
Solar battery generates DC that’s thesame as HVDC !

Existing Solar
Power Generation
PowerConditioner

What percent ofSolar power will befed ?

DC Doesn’t need Power ConditionerPowerSelling Local Generation for Local Consumption

AC Reasonable Investment...Say goodbye to Power Conditioners.

Power Purchase

Data CenterPower Company

HVDC

Power LossReduction :5 % - 10%

Plus ! Solar

Simple & Direct

DCDCPower Company
Copyright © 2013 NTT DATA INTELLILINK Corporation

HVDC

Data Center
9International standardization activity for DC12V
DCEM-WG has officially started as a member of Green University of Tokyo Project
DCEM-WG（Data Center Energy Management Working Group）■SWG1・・・・DCIM（Data Center Infrastructure Management）■SWG2・・・・HVDC system(High Voltage Direct Current System）
to be standardized internationally(ITU etc.)

to be standardized internationally(ISO/IEEE etc.)

Step 3

Step 3

ASP・SaaS・CloudConsortium

Japan Data CenterCouncil(JDCC)

Ministry of Internal Affairs
and Communications

Ministry of Economy,
Trade and Industry

Step 2
Technical Spec

Green Universityof Tokyo Project
Copyright © 2012NTT DATA Corporation

DCEM-WG

DPPE
Datacenter Performance
Per Energy

To make the Technical SPEC for
Step 1 HVDC/12V PS with DCIM,
After one year, via demonstration
experiments, we will set the standard
for DC12V
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High Voltage Direct Current – Open Compute Project
3φ AC480VUPSACDCACACDC

DC12V

MOTHER
BOARDACin

DC12V-SERVER

Battery

SERVER RACKACin
3φ AC480V/1φ AC277V

AC

DCBatteryOpen Compute projectOpen Rack Hardware v1.0 V2 Power shelf

AC

HVDC

DC340V/380V

MOTHERBOARD

HVDC

DCACin

DC12V server
DC12V server
DC12V server
AC/DC

DC12V-SERVER

21inch RACKSERVER RACKBattery

HVDC Open Compute project

DC12V

DC12V Server
DC12V server
DC12V server
AC/DC
DC12V server
DC12V server
DC12V server
AC/DCOpen Compute Project

DC12V

MOTHERBOARD

DC12V-SERVER

HVDCin

HVDCinSERVER RACKHVDCin

DC12V server
DC12V server
DC12V server
DC/DC
DC12V server
DC12V server
DC12V server
DC/DC
DC12V server
DC12V serverDC12V server
DC/DC21inch RACKHVDC Open Compute Project
Copyright © 2012NTT DATA Corporation

11Copyright © 2012NTT DATA Corporation

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