Old 05-23-2013, 01:44 PM #1
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Default re-flowing using TEC

I had the idea to set my own LEDs or Cree emmiters myself, but without using a hotair gun or toaster oven/frying pan... brilliant this will work on those single side driver boards for sure.



This is not my video just one I found, but hey good on this unless it has been posted here before.


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Old 05-23-2013, 01:59 PM #2
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Default Re: re-flowing using TEC

One thing I'd be worried about is the solder in the TEC itself melting .. lol
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Old 05-23-2013, 02:02 PM #3
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Default Re: re-flowing using TEC

PilotPTK definitely knows what he's doing. cool video.
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Old 05-23-2013, 02:10 PM #4
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Default Re: re-flowing using TEC

Very interesting video, thanks for sharing.
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Old 05-24-2013, 01:01 AM #5
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Default Re: re-flowing using TEC

So...

with solder paste - and this is very specific to the type of solder paste you're using, the manufacurer of the paste should include a datasheet with a "profile" to match the physical paste characteristics. High volume re-flow ovens have configurability to run the melting - cooling process to match the specific profile for the job. This ensures a much higher yield of quality joints being made.

Reflow soldering - Wikipedia, the free encyclopedia

I bring this up because I just saw how it was done in one of Vishay's re-flow labs. (We have wave soldering and re-flow in the test and reliability lab)

I think if the solder is left in the "reflow" state too long, there is a higher susceptibility to burning out the flux. If the cool down process is too slow, you risk higher chances of cold joints and damaging components.

My idea for here is that instead of simply turning the TEC off - I would argue that reversing polarity of the TEC will ensure a better cool down ramp - which would better match a typical paste "profile".

All the re-flow machines I see operate have active cooling for the boards once they emerge from the conveyor-belted oven. I'm sure with a stream controller, a DAC, and a bipolar constant current - voltage controlled supply, once could "upload" a profile to a microcontroller - which could stream the profile's data in time to a TEC current control on the TEC PSU.

It would be a great project!
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Last edited by Meatball; 05-24-2013 at 01:02 AM.
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