@midori11 I believe they are using the same Phosphors. Lasers have an exact freuency. Blue LED frequency can drift due to junction temperature and manufacturing variability.
Ron's first book on Power Supplies is more general. In the 2nd book he co-wrote with me, there are drivers for LEDs. What effects are you talking about?
@drnap1 Driver part of the cost depends on a lot of factors, how many LEDs, voltage, isolation, etc, etc. If you have a more specific area, then I can give more details. Typical cost reduction is about 30%.
@ledlighter The light emitting part is usually AlGaN or GaN. These are being put on Silicon substrate for state of the art, low cost LEDs. Look for them in a year or so.
Thanks for the talk Carol! I have heard that also phosphor converted Laser-diodes are now in development for automotive lighting. Are the requirements for those phosphors the same as for conventional high power pc-LEDs?
Does Ron's book specifically talk about driving LEDs? I heard in your talk that you were driving different frequencies into the LEDs. I also know there is yet more that can be controlled about the drive to give specific effects. Does he address that in his book?
@syakovac There are many LED Driver ICs. For each IC, you can configure it into different topology, Buck, Boost, etc. Ron has a book Practical Design of Power Supplies. He also does consulting.
Thanks Carol! Interesting comment on drivers. What typical percent of overall assembly costs are the drivers? What type of reduction in cost has Ron been able to achieve?
Thanks, Carol, for the presentation. Alex seemed to believe that some LEDs produce light from silicon junctions (rather than silicon being used only for a substrate). One of us (Alex or me) has a misconception; can you clarify the situation? Specifically, do any LEDs produce light from from a silicon junction?
@drnap1 If your design allows multiple low power LEDs, and assembly cost insn't prohibitive, that's probably the way to go for lowest cost, at least for the near future, until high power LEDS come down in cost. There are other advantages for multple strings of LEDs in terms of redundancy.
I bet the driver has opportunities for cost reduction. This is a specialty of my partner, Ron Lenk. I've seen him improve on many power supply designs and reduce cost.
For the custom drivers you were referring to, how are they made? Are they ASIC implementations or small PCB implementations. What kind of data processing rates are required typically?
Hi Carol! Thanks for the radio talk. I'm interested in finding out the LEDs used for flat screen TVs. What is the type of LEDs typically used, cost, light output of them?
Carol: The Holy Grail of automotive LEDs is the headlight. Do we foresee a day when headlights will universally use LEDs? Or is it too expensive for entry-level vehicles?
When it comes to the cost of a rear LED lamp assembly, 50% or more of the cost is the electronics. Is it cheaper now or will it eventually be cheaper to use few high power LEDs vs many low pwer LEDs and affect overall cost of lamp assemblies
Alex Wolfe is continually asking basic elementary questions where the answers are so basic they have been on Wikipedia and numerous online sources. This "Live Chat" is a waste of time. I was led to believe I might here state-of-the-art and up-to-date cutting edge discussion of products and technology. Instead, the moderator acts like he is giving a tutorial to investors!!! And this is a Design News broadcast??? Wake up!!!!
The whole process to get to the event is cumbersome, and then it does not work on all devices. Bad organization and logistics unless you do not want people to participate.
Hi David - Is it possible for you to try using a different browser, if your speakers volume is set high enough? It's streaming audio, and some companies do block streaming audio for bandwidth issues.
To clarify, this is an audio radio show - there are no slides or video. Alex and Carol are speaking now, and the instant chat will start at about half past the hour.
The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams.
The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.
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