efficient power distribution - hot chips
TRANSCRIPT
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Efficient Power Distribution 277Vac distribution w/o centralized UPS 95% High Efficiency solution Battery Cabinet as Distributed Backup Energy Unit
Pierluigi Sarti
Technical Lead, Power
August 17, 2011
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Traditional power distribution
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Optimized power distribution
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4x12V Batt
48VDC Battery Charger
4x12V Batt
4x12V Batt
4x12V Batt
4x12V Batt
48VDC Battery Cabinet
48VDC standby
MOBO
AC to DC 277VAC – 12VDC
Back up converter 48VDC-12VDC
277VAC
12VDC
*Server PS
N+1 battery
277VAC
L E G E N D Online Power
Backup Power
Power Backup Scheme
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Open Compute PS
A modern ‘std power distribution’ vs. ‘Open Compute power’
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Traditional UPS & PDU $2.00 / W
Optimized UPS & no PDUs $0.10 - $0.35 / W
DC offline UPS – CapEx saving
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Dual-input Open Compute 450W PSU - high level block diagram
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38Vdc to 58Vdc
Dual-input Open Compute 450W PSU - functional block diagram
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12Vdc
54Vdc
277Vac
120mm
220mm
63mm (1.5U)
OCP 450w PSU form factor
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• Custom 1.5U tall, high volume
• 48VDC backup equipped
• HE AC–DC switching
• 180 – 290 VAC wide input range
• 94.5% efficient
• Low iTHD < 5%
• High Power Factor > 0.99
• Board-to-board mating connector
• Pin and plunger mounting
• Single low-speed cooling FAN
• Random restart after AC outage
avoids Genset potential start-up
issues
OCP 450W Power Supply
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OCP PSU Backup Sequence
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5 sec
AC Current = 0 Amps
AC Current = Full Load
AC Random Restart (real measurement)
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• Efficiency target (277Vac input) :
Eff. > 95% (50% to 90% of full load)
• Efficiency also exceeds Climate Savers Computing Initiative “PLATINUM” std.
• Power Quality target (277Vac input) :
PF > 0.95 (> 20% of full load)
THD < 10% (> 20% of full load)
• High PF & low iTHD reduce losses in transformers, noise in power lines, Neutral Current, GenSet start-up problems, etc.
OCP 450W PS Efficiency targets
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Server level with custom power strips (top view)
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OCP Server chassis
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12Vdc
48Vdc 277Vac
OCP Server chassis
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AMD / Intel motherboards
450W power supply
fans
drive cage
OCP Server chassis
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System & Backup Power – Functional Block Diagram
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OCP Battery Cabinet
• Custom DC offline UPS
• 56kW or 75kW, 277VAC 3-phase input
• Six 48VDC 175A outputs
• 45 sec backup time at full load
• 95% efficient Rectifiers for batteries
charging and online power for IT Switches
• 20 sealed VRLA high-discharge batteries
• Battery monitoring system (impedance
measurement), Vbatt, Ibatt, temperature
• Two 50A 48VDC aux outputs for IT Switches
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OCP Whole System
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OCP DC Offline Backup Energy Unit: Battery Cabinet
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OCP 56.6KW Battery Cabinet
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Open Compute Project – Whole System
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High-Current DC bus-bar enhancement
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Open Compute Project – Whole System
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Rack level cabling
• Front access only
• Network cable
management harness
• 30 outlets 277VAC
(custom AC power strip)
• 30 outlets 48VDC
(custom AC power strip)
• Custom 277VAC and
48VDC power cords
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Plug
Housing
Strain
Relief
Plug
Housing
Strain
ReliefShield Net
L = 6’ +3”/-0
Plug
Housing
Strain
Relief
Plug
Housing
Strain
ReliefShield Net
L = 6’ +3”/-0
AC & DC Power Strips in the triplet rack column
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• Triplet RACK design – 90 servers
• Fast deployment, rolling casters
with levelers
• Welded 2” square-tube frame,
powder coat finish
• Hot/cold isle containment
• Six 1U auxiliary shelves (IT Switches)
• High IT Switch port utilization
Triplet Rack
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• 700W output • High power DC backup mode • Output Current sharing capable • Same form factor as Open Compute 450W power supply • Updated output connector, back compatible • Efficiency exceeding 95% on broad load range
Open Compute 700-SH power supply
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New Windmill System with OCP 700W-SH PSU
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New Windmill System with OCP 700W-SH PSU not installed
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New Windmill System with OCP 700W-SH PSU installed
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