Shaping light2011 led architexture-picusled-2

Architecture of LED systems

Fotonica-2011Rob AlferinkMarch 30.

Shaping Light 2011, PicusLED

Outdoor

Mobile Phone

Automotive

IndoorDisplay

LED system, typical architecture

Shaping Light 2011, PicusLED

control

driver

Shaping Light 2011, PicusLED

Interactions

MCPCB

FR4

Breakdown

Performance-Reliability-flexibility-COSTS

Shaping Light 2011, PicusLED

Breakdown on deeper level

Shaping Light 2011 ,PicusLED

System engineering on a high level with options to optimize the LED

Outdoor Lighting fixture

Shaping Light 2011, PicusLED

Tube

LED

Plastic cover

Heat sink Proper lensLEDs for 900 lm

RGB mixing, another issue

Shaping light 2011, PicusLED

3 color differ in dom wavelength3 colors in xy color space

BBL

Make 3000K

Drift by increase of ambient T

25C

50CAnsi bins

Requiers color measurement and control

Linear LED source, looks simple

Shaping Light 2011, PicusLED

T junction

T solder

T heatsink

T ambient

Rth -LED

Rth -board

Rth –heat sink

25 C

50 C

SO:For 50 cm12 x 1 W48 x ¼ W

Linear source , uniformity

Shaping Light 2011,PicusLED

Standard coverDiscrete sources

Diffuser materialLine source

So For 50 cm

12 x 1 W 12 x3=36V

48 x ¼ W 144 V

3 parallel strings of ~ 48 V

Binning issue ?!

Binning

Shaping light 2011, PicusLED

Flux [lm]-Forward voltage [V]- color CCT or dom. wavelength [x,y]

0.24 V * 16 = 4V

Architecture of LED systemsAny questions?

Shaping Light 2011, PicusLED