d esign for c onstraints neil e. cotter ece department university of utah [email protected]
TRANSCRIPT
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DESIGN FOR CONSTRAINTS
Neil E. Cotter
ECE DepartmentUNIVERSITY OF UTAH
QuickTime™ and a decompressor
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decompressorare needed to see this picture.LED Lightbulb Constraints
• LED bulb design• Realistic design constraints
•Economic•Environmental•Social•Political•Ethical•Health•Safety•Manufacturability•Sustainability
QuickTime™ and a decompressor
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decompressorare needed to see this picture.LED Bulb Design
• Individual LED’s• Metal heat fins• 110 VAC to 4 VDC power
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[2][1]
QuickTime™ and a decompressor
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decompressorare needed to see this picture.Economics
• Longterm Cost < CFL and Incandescent• Initial cost > CFL and Incandescent
[3]
Light
bulb projecte
d lifespan
50,000
hours
10,000
hours
1,200
hours
Watts
per bulb (equiv. 60
watts)
10 14 60KWh of
electricity
used
over 50,000
hours
300 500
700 3000
Cost of
electricity (@
0.10per
KWh)
$50 $70 $300
Bulbs
needed for 50k hours of use
1 5 42
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.Environment
[4]
Light
bulb projecte
d lifespan
50,000
hours
10,000
hours
1,200
hours
Watts
per bulb (equiv. 60
watts)
10 14 60KWh of
electricity
used
over 50,000
hours
300 500
700 3000
Cost of
electricity (@
0.10per
KWh)
$50 $70 $300
Bulbs
needed for 50k hours of use
1 5 42
• Huge power savings depending on
hours of light use per day
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.Society
• Can the poor afford LED bulbs?• Transition cost per room > $50
[5]
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.Politics
• Incandescent ban postponed
[6]
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.Ethics
• Should CFL and Incandescent be banned?
[7]
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.Health
• Is quality of light adequate?• Can use phosphors to create colors
[8]
Light
bulb projecte
d lifespan
50,000
hours
10,000
hours
1,200
hours
Watts
per bulb (equiv. 60
watts)
10 14 60KWh of
electricity
used
over 50,000
hours
300 500
700 3000
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.Safety
• Lower temperature?• Less heat• Lower voltage
Light
bulb projecte
d lifespan
50,000
hours
10,000
hours
1,200
hours
Watts
per bulb (equiv. 60
watts)
10 14 60KWh of
electricity
used
over 50,000
hours
300 500
700 3000
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.Manufacturability
• Energy to manufacture < CFL and Incandescent
[9]
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.Sustainability
• No mercury [10]
• Some arsenic and lead if manufactured poorly [11]
[11]
QuickTime™ and a decompressor
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QuickTime™ and a decompressor
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decompressorare needed to see this picture.LEDs are the Future
• Less energy
• Less toxic
• Less cost
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[1]
QuickTime™ and a decompressor
are needed to see this picture.QuickTime™ and a
decompressorare needed to see this picture.References
[1] http://eartheasy.com/live_energyeff_lighting.htm
[2] http://blog.makezine.com/2011/08/09/led-light-bulb-teardown/
[3] http://eartheasy.com/live_led_bulbs_comparison.html
[4] I.L. Azevedo, M.G. Morgan, F. Morgan, “The transition to solid-state lighting,” Proceedings of the IEEE, vol. 97 , issue 3, 2009 , pp.
481-510. Digital Object Identifier: 10.1109/JPROC.2009.2013058
[5] http://www.sears.com/shc/s/p_10153_12605_SPM6583418602P?sid=IDx20070921x00003a&ci_src=14110944&ci_sku=SPM6583418602
[6] http://www.washingtontimes.com/news/2011/dec/16/congress-overturns-incandescent-light-bulb-ban/
[7] Stevenson, R. “LEDs for less” IEEE Spectrum, vol 49, issue 1, 2012, pp. 39 - 40. Digital Object Identifier:
10.1109/MSPEC.2012.6117834
[8] I.L. Azevedo, M.G. Morgan, F. Morgan, “The transition to solid-state lighting,” Proceedings of the IEEE, vol. 97 , issue 3, 2009 , pp.
481-510. Digital Object Identifier: 10.1109/JPROC.2009.2013058
[9] S. Uddin, H. Shareef, A. Mohamed, M. A. Hannan, K. Mohamed, “LEDs as energy efficient lighting systems: A detail review,”
Research and Dev (SCOReD), 2011 IEEE Student Conference on, pp. 468-472, 2011.
[10] E.F. Schubert “Invited talk: Promises and challenges in light-emitting diodes for lighting applications”, Microelectronics and Electron
Devices (WMED), 2011 IEEE Workshop on, 2011, pp. 1. Digital Object Identifier: 10.1109/WMED.2011.5767269
[11] http://today.uci.edu/news/2011/02/nr_LED_110210.php
Neil E. [email protected]
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