SimuLAMP

2,431 views

Published on

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,431
On SlideShare
0
From Embeds
0
Number of Embeds
1,495
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

SimuLAMP

  1. 1. Multi-functional analysis of LED lamps and arrays SimuLAMP software February 2010 Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  2. 2. Modeling of LED package operation by SimuLAMP software Thermal LED manufacturer Optical management management LED datasheet Thermophysical Boundary Lamp design properties conditions LED Phosphor and optical spectrum properties properties Heat release • in the LED chip: Q=U·I-L Heat release • in an encapsulant due to light absorption Electrical management SimuLED™ Two options for specification of power supply: (die operation) • Current flowing through a particular chip is directly specified by the user Temperature Temperature • The user specifies the electric circuit and the dependent Dependent program calculates the currents I-V curve L-I curve
  3. 3. Problems to be solved by SimuLAMP simulator Thermal design of LED lamps and arrays with account of heat release in both LED chip(s) and encapsulants (via light absorption) Optimization of light conversion and analysis of color performance of white LED lamps and arrays Design and optimization of multi-chip packages, including RGB lamps and multi-pixel arrays Optimization of diode interconnection and circuits in the multi-chip lams accounting for thermal coupling of individual devices Analysis of lamp operation under DC, AC and quasi-CW power supply, including transient effects Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  4. 4. SimuLAMP is a multi-functional tool for design of LED lamps and arrays Characteristics computed by SimuLAMP Optical losses in package, temperature distribution in the lamp, thermal resistance, transient temperature variation with time Near and far field radiation patterns Emission spectra, CCT, CRI, and color coordinates (local and dependent on the observation angle) Luminous flux, efficacy, and brightness Integral electrical and thermal characteristics of LED arrays and circuits Characteristics of LEDs operating under DC, AC, and quasi-CW power supply Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  5. 5. Presentation of SimuLAMP capabilities Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  6. 6. Transient heat transfer in an LED lamp after switching-on the power evolution of temperature distribution after switching-on power supply t=0 t=3s t=6s t = 20 s t = 50 s t = 100 s Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  7. 7. Different phosphor configurations can be simulated Filling up to fixed level Hemisphere Case Chip Epoxy Phosphor Phosphor cap Remote phosphor Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  8. 8. Analysis of color quality in the far-field zone white-light lamp based on a yellow- phosphor conversion of light emitted by a blue LED yellow ring at glancing observation angles is caused by a larger path of a blue ray passing through the conversion media integral and local color characteristics in the far field are projected into the color diagram Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  9. 9. Emission spectra and radiation pattern in the far-field zone integral emission spectrum of the LED lamp x Intensity distribution Far-field radiation pattern Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  10. 10. Coupled Thermal/Optical effects simulated by SimuLAMP SimuLAMP allows the user to study Isothermal Computation the effect of non-uniform Tchip = 300 K temperature distribution on Light power = 0.7488 W optical characteristics of LED lamp accounting for the most critical issues: Chip I-V and L-I curves are temperature dependent Phosphor IQE is temperature dependent Phosphor excitation and Coupled Heat Transfer and Ray emission spectra can depend on Tracing Computation temperature Tchip = 348.7 K Light power = 0.6436 W LED spectrum can depend on temperature Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  11. 11. Effect of temperature dependence of phosphor IQE on light quality Tph = 400 K, x = 0.274, y = 0.295 Tph = 300 K, x = 0.311, y = 0.35 Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  12. 12. Multi-chip packages and AC LEDs interconnections in an AC LED lamp (Epistar) position of red, blue, and simulated optical green LEDs in a multi-chip power LED (Arima Optoelectronics) simulated current through the lamp Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  13. 13. DC operation of LED array integrated in a package Operation of a lamp containing 100 LEDs in the package light intensity distribution temperature distribution Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  14. 14. SimuLAMP operation Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  15. 15. Single and multiple chip optics in SimuLAMP without light conversion Problem specification in the program Lamp design (lens, PCB, heatsink, etc.) Optical characteristics of the lamp units Positioning of the LED die (dice) on a submount LED emission spectrum (for each LED in the Lamp) I-V and L-I characteristics (for each LED in the Lamp) Current magnitude for each LED or an electric circuit used for power supply applied to LED array In case of circuit, association between a diode in the circuit and the LED placed on the submount Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  16. 16. Lamp design specification To simplify input of the geometry, the whole lamp is considered as an axisymmetric object, while the submount with single or several LED dice is simulated in a 3D way. So, the user needs to specify 2D side view of the lamp. and 2D layout of the submount Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  17. 17. Multi-chip design 2D side view of the 64-chip lamp and 2D layout of the submount. Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  18. 18. Assigning the materials to the closed contours The surface emitting light has to be specified Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  19. 19. LED emission spectrum Specification of LED emission spectrum for each LED in the RGB lamp Spectrum exchange utility Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  20. 20. I-V and L-I characteristics LED characteristics can be temperature dependent The user selects between specification of L-I and WPE-I curves Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  21. 21. Conversion medium Phosphor mixture could be specified Express analysis of conversion medium Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  22. 22. Assignment of power supply Manual specification of currents flowing through each LEDs in RGB lamp Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  23. 23. Circuit specification In this mode the user specifies the circuit design and assigns the total voltage supplied to the LED array Visualization of the isothermal circuit computations Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  24. 24. Solver window Computation mode specified by the user Log file Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  25. 25. Analysis of computations • Built-in visualization • Graphics can be stored as JPG file • Analysis of results using the SimuLEDView s/w tool Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com
  26. 26. Conclusions Consulting service & software support: www.str-soft.com/contact/ Information on commercial software www.str-soft.com SimuLAMP presentation is available at the STR website http://www.str-soft.com/products/SimuLED/SimuLAMP/ Detailed info on s/w capabilities is available upon request: Code description, GUI manual, Technical papers published by STR research team Copyright © 2010 STR Group Ltd. All rights reserved www.str-soft.com

×