Transcript NAME OF PRESENTATION

LEDs: Lighting the Future
Presenter:
Ted Kretschmer, Mechanical Engineering
Mentors:
Dr. Xuejun Fan, Mechanical Engineering
Dr. Liangbiao Chen, Mechanical Engineering
OUTLINE
•
•
•
•
•
Importance of LEDs
LED Basics
Technical Challenges
Proposed Research
Summary
Why LEDs?
*Energy Savings Forecast of SSL in General Illumination Applications (DOE) : August 2014
ADVANTAGES OF LEDs
•
•
•
•
•
Efficiency
Longevity
Color
Color Temperature
Inherently Safe
LED Efficacy Vs Traditional Lighting
LM/W
• Incandescent
• 15 lm/W
• Halogens
• 20 lm/W
• CFLs
• 73 lm/W
• LEDs
• 94 lm/W
•2030 LED Projections
• 220 lm/W
220
250
200
94
150
73
100
20
50
15
0
LED
Projections
LEDs
CFLs
Halogens
Incandesent
*2014 DOE SSL Multi-Year Program (DOE): April 2013
PRINCIPALS OF LEDS
PRINCIPLES OF LEDs
Current
LED HISTORY
Lumens
100
10
1
0.1
0.01
0.001
1970
Information attained from the DOE Website
1980
1990
2000
2010
Year
MAKING WHITE LIGHT
– Phosphorous Conversion
– Color Mixing
• Red Green Blue
– Hybrid Method
*LED Basics (DOE)
COMPONENTS
TECHNICAL CHALLENGES
Thermal Management
TECHNICAL CHALLENGES
• Thermal effects are unique to LEDs
• Components have individual reliability
statistics
• True system reliability is unknown
• Hammer Testing Method
WHAT I PLAN TO DO
• Previous years work
• Optimization of white LED with variable currents and
temperatures
• One dimensional heat transfer analysis
• Moving Forward
• Advanced thermal analysis of LED components
•
Design of heat sinks that better dissipate heat
• Reliability Study
•
Individual Components
THERMAL ANALYSIS
• Study of available LED
lamps
• Design of optimal heat
sink
• FEA Model
RELIABILITY STUDY
• Research component level
failure mechanisms
• Correlation study between
thermal management and
component failure
SUMMARY
•
•
•
•
LEDs are Efficient
Many Advantages
Technical Challenges
Proposed Research
• Thermal Analysis
• Reliability Study
Questions