The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a...
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![Page 1: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/1.jpg)
The Reliable Power Supply – an Oxymoron?
Can a power supply actually be reliable? Is there such a thing as a Million Hour Power
Supply? Can you just specify the reliability and get it? Picking a good supplier is important, but is it
enough? How about MTBF calcs? --stress analysis?
–---What kind of testing?
![Page 2: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/2.jpg)
In Search of Dependable Power
Pick a good supplier Specify the important stuff Trust but Verify Measure Field performance
![Page 3: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/3.jpg)
You want a Good Power Supply?
No matter whether OEM or Custom:
Check out your supplier!
![Page 4: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/4.jpg)
Important Specifications
Field MTBF Life Expectancy Require Failure Analysis of returned units MTBF Calculation?
![Page 5: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/5.jpg)
Supplier check list
– ISO certification; Quality Manual
– Design (review and test)– Manufacturing (FA and CA process)– Material control (AVL)– Effective QUALITY Management– Reliability reporting and feedback
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Stick to New Technology
![Page 7: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/7.jpg)
Picking a good Supplier
You’re going to have problems: make sure you pick one that you can deal with– Accessibility of responsible personnel– Receptive attitude– Dialog
Make sure he understands that “Failure Analysis” is not the same as “Repair”
![Page 8: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/8.jpg)
Proof of the Pudding
Don’t expect the Field to take care of itself– Real-time field tracking exposes problems as they
happen Design problems Revision incompatibility Customer specific Supplier process problems
![Page 9: The Reliable Power Supply – an Oxymoron? Can a power supply actually be reliable? Is there such a thing as a Million Hour Power Supply? Can you just specify.](https://reader035.fdocuments.in/reader035/viewer/2022062511/5514aa20550346d36e8b5e28/html5/thumbnails/9.jpg)
Field Data Tracking
FACTORY CONTROL SYSTEM
INSTALLED SYSTEMS CONFIGURATION
DATABASE
FIELD SERVICE ACTIONS
DATABASE
HP NonStop Tracking Databases
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How Good is Good?
Range from 300,000 to 1.6 Million hoursActual
Pwr Supply Watts Outputs Spec Field MTBFA1 750 5 1,000,000 1,500,000A2 750 5 1,000,000 300,000B1 1500 1 1,500,000 1,752,000B2 1500 1 1,500,000 584,000
D1.1 1200 1 1,500,000 324,444D1.2 1200 1 1,500,000 547,500D2 1200 1 1,500,000 673,846E1 276 1 1,000,000 1,135,000E2 276 1 1,000,000 1,135,000F1 460 1 750,000 585,000F2 460 1 750,000 585,000
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Two Vendors, Same PS
One year’s Field Data3-month rolling average
1,464,570
314,755
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
Apr
May Jun
Jul
Aug Sep Oct
Nov
Dec Jan
Feb
Mar
Apr
May
MT
BF
(H
rs)
Vendor B
Vendor A
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Early Wearout
Weibull Hazard Plot for System Power Supply
Slope = 1
0.01%
0.10%
1.00%
10.00%
100.00%
1 10 100 1000 10000 100000
Time to Replacement Since First Customer Ship
Cu
mu
lati
ve
Ha
zard
Slope > 1 : Increasing Failure RateSlope = 1 : Constant Failure RateSlope < 1 : Decreasing Failure Rate
(Hours)
Wearout began at ~2 years
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Tales from the Crypt
AVL Control Customer environment Fan Selection Design problem Board layout Manufacturing process
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Conclusion: In Search of Dependable Power
Pick a good supplier Specify the important stuff Trust but Verify Measure Field performance