MF01 Mini / MT07- Mod/Upgrade - Copper Heatsink Cover Plate

mukenukem · 2020-01-10T12:26:58.000Z

I would like to have 2 pcs. Great idea !

PBWilson · 2020-01-10T12:43:31.000Z

I’m interested in the second batch. Please sign me up.

man_of_light · 2020-01-10T18:05:33.000Z

For everyone interested, today I updated the post #1 and post #2 with some news on the Status and the 2nd batch.
Please take a look for the latest infos.

Gerrit · 2020-01-10T13:07:19.000Z

It works great, done in 15 minutes.

deus1ex · 2020-01-10T15:43:11.000Z

Interest in one

Lexel · 2020-01-10T16:03:04.000Z

Thermal test now done

Test conditions:
driver temp sensor on PCB calibrated
set to 50°C
Full AMC heating at 2.4A

Time lapse x5 almost 5 minutes

I found that stock the Anduril firmware seem to quite regulating after first throttle, it may get into unsafe temperatures
In an assembled light a lot of the heat will be conducted away from battery tube, so the bare AMCs will stay a bit cooler
and the AMC heat spreader will stay quite a lot cooler than in this test

1. tested stock upper left
it seems after first throttle the temperature regulation quits and it heats up to 70°C on PCB

2. Aluminum prototype
lower left

3. production sample copper

middle upper and lower

gchart · 2020-01-10T16:27:07.000Z

Great comparison, Lexel. The clamp meter is a bit hard to read in the copper spreader test, but it looks like it stays around 2.4A perhaps? Aluminum doesn’t appear to be too far behind, but definitely better than running it bare.

man_of_light · 2020-01-10T17:31:15.000Z

Lexel:

Thermal test now done

Thanks for the test Lexel, great Job :+1:

As expected, the temperatures on the copper version stays a bit lower than on the aluminum version.
Also the heat distribution between the heatsink and the head seems to be best balanced on the copper version.

Lexel · 2020-01-10T18:11:06.000Z

Yes with both heat spreaders in those 5 minutes the light ran constant, the clamp meter sometimes is acting bad not reading correct or fluctuating a bit, I may have to open it and clean

I am not sure how the temperature is affected in the total light assembly
with it the temperature is definitely a lot lower as the driver gets most cooling connection to the battery tube

But the strange behavior when thermal throttling should be history

Still it seems there is a bug in the firmware when it ran without heat spreader Anduril kept going almost at 100% while the light constantly heated up far behind the set point

moonstone4 · 2020-01-10T18:16:27.000Z

I am interested in 2 of them.

olles · 2020-01-10T18:31:22.000Z

Thanks for making a second batch!
Olles

ZozzV6 · 2020-01-10T18:37:54.000Z

man of light you can add my post link to the OP where I have images of thermal paste and silicone heat pad images added

Alvaro52021 · 2020-01-11T13:24:44.000Z

Interested!!! How can i get one of those!?? Thank you

Alvaro52021 · 2020-01-11T13:40:58.000Z

Interested in 1

man_of_light · 2020-01-11T14:39:20.000Z

ZozzV6:

man of light you can add my post link to the OP where I have images of thermal paste and silicone heat pad images added

Good idea Zozz, I’ve just added an alternative method of thermal contacting using thermal pads in the description of post #1 with a link to your post.

I also mentioned and linked the thermal test from Lexel in the OP.

Alvaro52021:

Interested!!! How can i get one of those!?? Thank you

Welcom to BLF, I’ve just answered your PM with some information and added you to the list of the 2nd batch.

nobody · 2020-01-11T15:19:24.000Z

ZozzV6:

So you need to make sure you use enough thermal transfer materials and I suggest using 0,5-1mm silicone thermal pads cutted shape on the 7135 top.

Just for clarification (maybe I missed something), you have pictures with the thermal pad on top of the 7135 chips and a picture with the thermal pad on the bottom of the copper plate. Do you recommend putting it in both places or is one better than the other?

ZozzV6 · 2020-01-11T17:12:43.000Z

nobody:

ZozzV6:

So you need to make sure you use enough thermal transfer materials and I suggest using 0,5-1mm silicone thermal pads cutted shape on the 7135 top.

Just for clarification (maybe I missed something), you have pictures with the thermal pad on top of the 7135 chips and a picture with the thermal pad on the bottom of the copper plate. Do you recommend putting it in both places or is one better than the other?

Not necessary. Those two pictures are two different try. Even if you add layers you make the thermal path worse. The second and current one is where I putted the thermal pad on the copper thing and cutted it exactly the shape it has. And I used thermap paste on the side of it. Then grabbed it with tweezers to put it in place.

nobody · 2020-01-11T17:57:28.000Z

Got it. Thanks.

mihlit · 2020-01-11T18:23:28.000Z

Interested in 1 piece

noboneshotdog · 2020-01-11T20:39:18.000Z

MoreLumens:

Hmm so which one is better; thermal paste or with pads?

Yes, please let us know. I was planning on paste……