Reference Design for Commercial Downlight with LED

OS SSL AE LED

Ch. Neureuther, Dr. A. Markytan

Seite 27. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Reference Designs

1. Introduction

2. Commercial Downlights

3. Construction & Optical parts of the luminaire

4. Part list & involved suppliers & LLFY-partners

5. Illuminance simulation of the luminaire

6. Measurement of the luminaire

7. Thermals Engineering

8. Electrical Engineering

9. Conclusions

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Commercial Downlights

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Commercial Downlights

RocketLIGHT DiscLIGHT

Seite 57. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Optical parts of Luminaire

1

2

LW W5KM JZ 7LTc TYP = 5600 K

1 LED 71 lm x 37 = 2627 lm

LCW W5AM-JXKX-4O9QTc TYP = 3500K

1 LED 63.5 lm x 37 = 2350 lm

Seite 67. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Part list of Luminaire + involved suppliers & LLFY-partners

OOSSRRAAMM OOSSJJuunnggbbeecckkeerr

FFiisscchheerreelleekkttrroonniikk

BBeerrggqquuiissttHHooffmmaannnnLLeeiitteerrppllaatteenn

FFrraaeenn

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Illuminance simulation of Luminaire

Seite 87. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

all-1-Lall-1-xall-1-y

L(Pixel)1.3001.2501.2001.1501.1001.0501.000950900850800750700650600550500450400350300250200150100500

L(cd

/m²)

;x;y

280260240220200180160140120100806040200

L [cd/m2]

2500 mm

f = 25 mm

3000 mm

2600 mm

Luminaire

Measurements on luminaire

Rho = 0.9

Luminance distribution

Lambertian wall

Seite 97. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Measurement on luminaire

L [cd/m2]

Luminance on Reflector

E[lx]

Illuminance distribution

Em = 1007 lx

L*πρE=

Ωο

Ω0

Seite 107. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Measurement on luminaire

all-1-xall-1-y

L(Pixel)1.3001.2501.2001.1501.1001.0501.000950900850800750700650600550500450400350300250200150100500

x;y

0,36

0,355

0,35

0,345

0,34

0,335

0,33

Color distribution

chromaticity coordinates x,y

Seite 117. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Thermal Considerations and Resultsemissivity correction factor = 0.95ambient temperature = 22°CRth JS max = 11 K/W (GD+)

Rth FR4 (Thermal Vias) = 9.7 K / W

Measured:P_min = 350mA* 2.85V = 0.99 W P_max = 350mA* 3.2V = 1.12 W

T_heatsink = 40 °CT_solderpoint = 45 °C

Tj ~ 55°C Phiv@55°C/Phiv@25°C ~ 0.94 dcx,dcy < -0.003

Seite 127. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Thermal Engineering / Components

• Thermal Interface:

• PCB: FR4 with thermal vias:

• FISCHER Heatsinks:SK 546 1000 ALSK 505 1000 AL

Seite 137. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Electrical Engineering - Luminaire

Luminaire• 37 x 1 W Golden DRAGON Argus• 6 independent circuits• Board Material: FR4 d = 0.8 mm• Electric Layer (Cu) 35 µm

•Possible: • µc (ATmega), PDs, NTC

Seite 147. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Electrical Engineering - Ballast

Ballast• Supertex Driver HV9931LG & Design• Use of 2 boards, each 80V 350 mA PWM dimmable• Prototype status

Seite 157. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Conclusions

Seite 167. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Spotlight White- HexLIGHT: Diamond Dragon LCW W5AP-LZMZ-4L8N

Seite 177. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

Tasklight White – BridgeLIGHT: OSTAR Helios CW

Seite 187. Lux et Color Veszpremiensis Szimposium | 2008 november 6 | OS SSL AE LED |

LEDs used

Downlight White - DiscLIGHT:Golden DRAGON Plus (LCW W5AM)

Downlight White – RocketLIGHT:Golden DRAGON ARGUS (LW W5KM)

Spotlight White- HexLIGHT: Diamond DRAGON (LCW W5AP)

Tasklight White – BridgeLIGHT: OSTAR SMT in warmwhite