1 / 65

LED failures: How to stop them dead

LED failures: How to stop them dead. LED failures: How to stop them dead David Scott-Maxwell Technical Director, Forge Europa. LED failures: How to stop them dead. Before we start – what are ‘LEDs’?:. LED failures: How to stop them dead. Before we start – these are ‘LEDs’:.

faxon
Download Presentation

LED failures: How to stop them dead

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LED failures: How to stop them dead • LED failures: How to stop them dead • David Scott-Maxwell • Technical Director, Forge Europa

  2. LED failures: How to stop them dead • Before we start – what are ‘LEDs’?:

  3. LED failures: How to stop them dead • Before we start – these are ‘LEDs’:

  4. LED failures: How to stop them dead • Before we start – these are ‘LEDs’: • ‘LEDs’ ARE NOT MUCH USE ON THEIR OWN!

  5. LED failures: How to stop them dead • Before we start – ‘LED failures’ = ‘Whole system failures’

  6. LED failures: How to stop them dead • Before we start – ‘LED failures’ = ‘Whole system failures’

  7. LED failures: How to stop them dead • What’s in a ‘Whole system’?

  8. LED failures: How to stop them dead • What’s in a ‘Whole system’?

  9. LED failures: How to stop them dead • What’s in a ‘Whole system’? • LED

  10. LED failures: How to stop them dead • What’s in a ‘Whole system’? • LED • PCB

  11. LED failures: How to stop them dead • What’s in a ‘Whole system’? • LED • PCB • Heatsink

  12. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Driver/PSU • LED • PCB • Heatsink

  13. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Driver/PSU • LED • PCB • Enclosure • Heatsink

  14. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • Driver/PSU • LED • PCB • Enclosure • Heatsink

  15. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • Driver/PSU • LED • Adhesives • TIMs • etc • PCB • Enclosure • Heatsink

  16. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • Driver/PSU • LED • Adhesives • TIMs • etc • PCB • Enclosure • Heatsink • Testing

  17. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • Driver/PSU • LED • Adhesives • TIMs • etc • PCB • Enclosure • Heatsink • Testing • Packaging

  18. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • The user! • Driver/PSU • LED • Adhesives • TIMs • etc • PCB • Enclosure • Heatsink • Testing • Packaging

  19. LED failures: How to stop them dead • What’s in a ‘Whole system’? • Optics • The user! • Driver/PSU • LED • Adhesives • TIMs • etc • PCB • Enclosure • Heatsink • Testing • Packaging

  20. LED failures: How to stop them dead • LED failures:

  21. LED failures: How to stop them dead • LED failures: • Electrical Overstress (EOS) • Overheat • Chemical Contamination • Electrostatic Discharge (ESD)

  22. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  23. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  24. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  25. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  26. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  27. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  28. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverseconnection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  29. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, educate

  30. LED failures: How to stop them dead • LED failures: Electrical Overstress (EOS) • Causes • ‘Hot Plugging’ #1 LED killer - VERY easily done! • …during in-factory test, luminaire installation • …can be latent • Reverse connection • Effects • Lights out (often short circuit) • Prevention • BE EOS AWARE, design-in circuit protection, lock down factory procedures, Educate

  31. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinking must be provided • …and users can/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers

  32. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinking must be provided • …and users can/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers • XM-L / 105° / 2A • L70>70khrs

  33. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinkingmust be provided • …and users can/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers

  34. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinking must be provided • …and userscan/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers

  35. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinking must be provided • …and users can/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers

  36. LED failures: How to stop them dead • LED failures: Overheat • Causes • Modern Lighting Class LEDs can run HOT… • …but there’s a limit to how much power they can handle • …and adequate heatsinking must be provided • …and users can/will overheat products • Effects • Reduced lifetime [LM80/TM21], colour shift • Prevention • Heatsinkdesign is tough – don’t underestimate • Educate customers

  37. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  38. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  39. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  40. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  41. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  42. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  43. LED failures: How to stop them dead • LED failures: Chemical Contamination • Causes • Silicones particularly vulnerable to ‘charring’ • LED manufacturer’s black lists & white lists • Sometimes reversible, sometimes not… • Effects • Reduced lifetime, colour shift • Prevention • Check the lists, do your own tests, be aware of ‘hidden’ chemical usage.

  44. LED failures: How to stop them dead • LED failures: Electrostatic Discharge • Causes • Rare due to protected LED components, • good ESD handling, protection via circuitry • BUT - can be latent… • Effects • Lights out • Prevention • Install & audit ESD handling procedures, design-in circuit protection

  45. LED failures: How to stop them dead • LED failures: Electrostatic Discharge • Causes • Rare due to protected LED components, • good ESD handling, protection via circuitry • BUT - can be latent… • Effects • Lights out • Prevention • Install & audit ESD handling procedures, design-in circuit protection

  46. LED failures: How to stop them dead • LED failures: Electrostatic Discharge • Causes • Rare due to protected LED components, • good ESD handling, protection via circuitry • BUT - can be latent… • Effects • Lights out • Prevention • Install & audit ESD handling procedures, design-in circuit protection

  47. LED failures: How to stop them dead • Driver/PSU failures: • Electronic product reliability • Key component lifetime • Soldering

  48. LED failures: How to stop them dead • Driver/PSUfailures: Electronic Product Reliability • Electronic products canbe extremely reliable! • … but ‘you gets what you pays for’… • ‘0.2%/1000hrs’ de-facto standard for lighting electronics

  49. LED failures: How to stop them dead • Driver/PSUfailures: Electronic Product Reliability • Electronic products can be extremely reliable! • … but ‘you gets what you pays for’… • ‘0.2%/1000hrs’ de-facto standard for lighting electronics

  50. LED failures: How to stop them dead • Driver/PSUfailures: Key Component Lifetime • Causes • Electrolytic capacitors • Freewheel diodes • Bridge rectifiers • Optocouplers • … etcetc … • Effects • Lights out, flickering, EMC non-compliance, … • Prevention • Design for product lifetime, control manufacturing

More Related