• Author Author: tonyboubady
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TI and Würth Elektronik LED RoadTest+ - Thermal Mania - 6/10

tonyboubady

While I am working on the PCB of my Smart Headlight circuit design, I got the sparkling idea about thermal protection for Würth Elektronik's LEDs. Würth Elektronik's LEDs has thermal pad contact on their high bright LEDs to control heat dissipation, I have seen some post from other Road testers too, but, my idea is to use single mid sized heatsink for all the LEDs. More or less 76 LEDs in total. I can't provide numerous heatsinks for that much volume of LEDs and in small size of circuit board...

 

So here is my approach...

 

image

 

It's not finished or the actual full circuit design, It's just the experiment deign to show you guys how I am going to use single heatsink for my LEDs. The curved or swirled traces will be on the centre of my circuit board, the outer most edges of the swirl trace will be connected to thermal pad of LEDs as I shown in the example PCB design. All the LED thermal pad traces will be well layered and connected to swirl traces, the centre most of swirl trace will be connected to single heatsink, either on the trace layer side of the circuit board or the backside. In this way I can reduce heat of numerous LEDs and connected to single heatsink, as well save space in circuit board...

 

So I am asking Würth Elektronik and other experts here to comment on this approach... As I am doing this as experiment with my little idea. Awaiting for your inputs

 

FYI: This is not actual PCB design with resistors,LEDS, etc, etc, it's just an example to show my idea, hope you people get my point here...

  • in reply to DAB

    Thanks for your reply, I was concerned about the electromagnetic waves too, but what will be the real cause here with EMI(Electro Magnetic Interference)? it's just an LED headlight, unless if I am going to use any RF like bluetooth or wi-fi... yes, I am curious about this design that what will be the effects, I will try my best to test the design with the resource tools I have....

     

    And as well I don't think there will be any voltage passing through that traces to produce electromagnetic waves...the traces will be connected to thermal pad of the LEDs, and I hope I will be correct and the LEDs won't produce any voltage on thermal pad other than heat.

     

    But... yes, as you said my first PCB will be the answer for all these...

  • I am concerned about your possible EMI creation along the traces.

     

    You are adding many antennas, even at low power, which can introduce some unwanted effects.

     

    That said, I am waiting to see what you find in testing the first boards.  You might want to set up a signal analyzer to see what kind of EMI you emit.

     

    DAB