The typical architecture of an LED system includes a driver, control circuitry, and LEDs mounted to a MCPCB (Metal Core Printed Circuit Board). The LEDs generate heat that must be dissipated via a heat sink. Proper lens design is also important for applications like outdoor lighting. RGB LED systems require color measurement and control to maintain consistent color mixing over variations in temperature. Linear LED light sources have thermal challenges to dissipate heat uniformly across the system. LED binning is used to group components by parameters like luminous flux, forward voltage, and chromaticity.

1. Architecture of LED systems
Fotonica-2011
Rob Alferink
March 30.

2. Automotive Outdoor
Display
Indoor Mobile Phone
Shaping Light 2011, PicusLED

3. LED system, typical architecture
driver
control
Shaping Light 2011, PicusLED

4. Interactions
MCPCB
FR4
Shaping Light 2011, PicusLED

5. Breakdown
Performance-Reliability-flexibility-COSTS
Shaping Light 2011, PicusLED

6. Breakdown on deeper level
System engineering on a high level with options to optimize the LED
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7. Outdoor Lighting fixture
Heat sink
Proper lens
LEDs for 900 lm
Plastic cover
LED
Tube
Shaping Light 2011, PicusLED

8. RGB mixing, another issue
Ansi bins
Make 3000K
50C
25C
BBL
3 color differ in dom wavelength Drift by increase of ambient T
3 colors in xy color space
Requiers color measurement and control
Shaping light 2011, PicusLED

9. Linear LED source, looks simple
SO:
T junction
For 50 cm
Rth -LED
12 x 1 W
48 T solder W
x¼
Rth -board
50 C T heatsink
Rth –heat sink
25 C T ambient
Shaping Light 2011, PicusLED

10. Linear source , uniformity
Diffuser material So For 50 cm
Line source
12 x 1 W 12 x3=36V
48 x ¼ W 144 V
3 parallel strings of ~ 48 V
Standard cover
Discrete sources Binning issue ?!
Shaping Light 2011,PicusLED

11. Binning
Flux [lm]-Forward voltage [V]- color CCT or dom. wavelength [x,y]
0.24 V * 16 = 4V
Shaping light 2011, PicusLED

12. Architecture of LED systems
Any questions?
Shaping Light 2011, PicusLED