neptune power subsystem
DESCRIPTION
NEPTUNE power subsystem. Progress and Plans April 2003 Harold Kirkham. Presentation outline. Progress review Converter Mission Assurance Delivery system Documentation Plans. DC-DC Converter. DC-DC Converter. LOAD. DC-DC Converter. DC-DC Converter. Progress: Converter. - PowerPoint PPT PresentationTRANSCRIPT
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Neptune Power Overview- 1 All rights reserved © 2003, Neptune
NEPTUNE power subsystem
Progress and Plans
April 2003
Harold Kirkham
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Neptune Power Overview- 2 All rights reserved © 2003, Neptune
Presentation outline
• Progress review– Converter– Mission Assurance – Delivery system– Documentation
• Plans
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Neptune Power Overview- 3 All rights reserved © 2003, Neptune
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Neptune Power Overview- 4 All rights reserved © 2003, Neptune
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Neptune Power Overview- 5 All rights reserved © 2003, Neptune
Progress: Converter• All operating principles demonstrated
– Efficiency and Voltage Regulation are excellent– Current is evenly shared by parallel stages– Voltage is evenly divided by series stages
DC-DCConverter
DC-DCConverter
DC-DCConverter
DC-DCConverter
LOAD
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Progress: Converter Efficiency
0.82
0.84
0.86
0.88
0.9
0.92
0.94
0 100 200 300 400 500 600 700 800 900
Output Power (W)
450 V
500 V
600 V
700 V
800 V
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Progress: Converter Regulation
-0.050%
-0.040%
-0.030%
-0.020%
-0.010%
0.000%
0.010%
0.020%
0.030%
0 100 200 300 400 500 600 700 800 900-0.050%
-0.040%
-0.030%
-0.020%
-0.010%
0.000%
0.010%
0.020%
0.030%
0 100 200 300 400 500 600 700 800 900
Output Power (W)
450 V
500 V
600 V
700 V
800 V
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Mission Assurance
• Four aspects:– Converter– Node Distribution System– Delivery System– Communications
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Mission Assurance: Converter
• Converter stack MTBF estimated: 40 years– Assume worst-case: failure takes out stack– Assume cold-standby redundancy– Assume 30 year NEPTUNE lifetime– Observatory may need a few replacements
• Assume substring failure is not fatal– Converter power de-rated by 17%– Observatory may never need a replacement
• The Message is: Don’t worry – BE HAPPY!
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Mission Assurance: Node Distribution
• Distribution system power at 400 and 48 V– Assume 400-V source is solidly available– Assume 48-V COTS converters– Assume COTS switches– This is so simple, we have deferred the design
• BOTE cost estimates done by JPL & UW– JPL cost: $2,000,000– UW cost: $250,000
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Mission Assurance: Node Distribution
• JPL assumes– Hardware handled by
certified people only– Complete paper trail for
all activities– Extensive testing, with
tests traceable back– Environment complies
with ESD and contamination rules
– All handling requires multiple personnel
• UW assumes– Hardware handled as
needed– Marginal paper trail
– Some testing
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Mission Assurance: Node Distribution
• The difference between these numbers is one of culture
• The two cost estimates are equally valid• Neither is “right” or “wrong”
• The product of the work is different, however• You pay for what you get• Is there a middle ground?
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Mission Assurance: Delivery System
• Triggered by concern over converter reliability, we have devised a “Version 2”
• The original motivation may not be valid, but the new design brings major benefits
• The biggest benefit of Version 2 is that node failures (power supply or comm failure) do not affect the backbone
• This segregation of function leads to better observatory availability
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How does Version 2 work?
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Component availability
• Zeners, qualified to 2A, preliminary study done for 10A upgrade• Capacitors, qualified• Latching relay, similar to qualified, limited re-qualification needed• Resistors, similar to part in qualification• Bridge, qualified• Controller, space qualified part may be suitable, limited development,
or control by analog electronics (qualified)
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Version 2 power sub-system Pros and Cons
• High reliability
– Parts are qualified or low development cost
– Low component count – Low power consumption– Switching only at low power
• Segregated functionality
– Better observatory availability
• Can use single conductor cable, BU to Node
– Cost savings
• BU requires a ground• Controllability reduced
– Switches cannot be remotely operated
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Progress: Documentation
ConfigurationManagement
Plan
ConfigurationManagement
Plan
ProjectDocumentation Plan
RequirementsDocument
DeploymentVessel ICD
OperationsConcept Doc
SystemDescriptionDocuments
VerificationPlan ICD
Test Plan
Reportsand
Minutes
Power ProjectHistory
PMACS
Protection
Converter
NEPTUNE level Power Subsystem level
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Neptune Power Overview- 18 All rights reserved © 2003, Neptune
Progress: Documentation
• All key documents started and on web site– Concept of Operations (Rev 5)– Test Plan (Initial) – Converter (3 files)– PMACS (17 files)– Assorted trade-offs– CoDR docs (37 files)
• Total number of files ~400