The best heat conductive substrate for flashlight

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aliang802
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The best heat conductive substrate for flashlight

For large power flashlight, the heat capacity of the light source is often concerned.

Most of traditional MCPCB we found on the market. The coefficients of heat conductivity of dielectrics are between 1~2 W/mK (1W or 2W in short). Of course, we can find 3W or even higher from the market. However, the copper or aluminum plate beneath the dielectric has coefficient of heat conductivity around 400W/mK and 200W/mK accordingly. It is clear that they have much better heat conducting performance than dielectric on top of them. This is causing dielectric to become the bottle neck of heat conducting & dissipating in traditional MCPCB.

The invention of thermoelectric separation of MCPCB is the best solution to overcome that bottle neck found in traditional MCPCB. Combining Super Pillar with thermoelectric separation concepts, to bypass dielectric and conduct heat directly through copper or aluminum pillar to copper or aluminum plate at the bottom. In this design, heat can be quickly take-away from components and dissipated through copper or aluminum plate at the bottom.

Now this MCPCB has been widely used in the flashlight, has been recognized by many customers.I hope that this sharing is useful to the flashlight enthusiasts on forum.

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

mattjk
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Yep, you pretty much summed it up lol.

Rufusbduck
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More commonly referred to as Direct Thermal Path (DTP), the center pad of the led footprint has no dielectric but is part of the actual metal substrate.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

DB Custom
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I’m still thinking about ordering a 12mm wide man made diamond to put a hot emitter on top of…

Dale

aliang802
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mattjk wrote:
Yep, you pretty much summed it up lol.

Kindly give me your advice. Smile

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

aliang802
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Rufusbduck wrote:
More commonly referred to as Direct Thermal Path (DTP), the center pad of the led footprint has no dielectric but is part of the actual metal substrate.

You are right, it seems that you have contact with it. SinkPAD have this technology in USA, and we had done a couple of years ago. Recently used in a flashlight is very common.

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

aliang802
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DB Custom wrote:
I’m still thinking about ordering a 12mm wide man made diamond to put a hot emitter on top of…
Thumbs Up

As the saying goes, musket to kill a butterfly.

Of course, money can’t buy you happy, imainly depends on your mood…

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

Manual Man
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Mini heat-pipes… thermal conductivity can be orders of magnitude better then diamond and should allow the LED to be soldered directly onto it if profiled correctly and pressed into a MCPCB.

Another thing to add to the list of things to try.

aliang802
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The following is the structure of thermoelectric separation MCPCB.

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

aliang802
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Practical photos (XHP70)

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

aliang802
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Practical photos (DEDOLIGHT)

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

teacher
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I can’t see the pictures you are trying to post. Smile

      You never know how a horse will pull until you hook him up to a heavy load. / Paul "Bear" Bryant ~/~\~ "Slow is Smooth, Smooth is Fast"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||   Confucius say -- Baaa-haaaaaa......   tongue-out

         Rudeness Level /\ mΩ /\ {width:70%} /\ LightWiki /\ LED Tint Chart /\ LED Tint Picture /\ Xlamp size chart /\ BatteryU                   Flashaholic? Need Professional Help???   wink   /\ TheOriginal /\ TAB /\ LightSearch /\ BatterySearch /\ 14500's /\ DiCal                                                       

aliang802
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teacher wrote:
I can’t see the pictures you are trying to post. Smile

Really? Then how can I do it?

But I can see the picture I sent.

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

teacher
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Try using the “picture” icon (7th from left) at the top of the Comment box. That is all I know to tell you.???

      You never know how a horse will pull until you hook him up to a heavy load. / Paul "Bear" Bryant ~/~\~ "Slow is Smooth, Smooth is Fast"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||   Confucius say -- Baaa-haaaaaa......   tongue-out

         Rudeness Level /\ mΩ /\ {width:70%} /\ LightWiki /\ LED Tint Chart /\ LED Tint Picture /\ Xlamp size chart /\ BatteryU                   Flashaholic? Need Professional Help???   wink   /\ TheOriginal /\ TAB /\ LightSearch /\ BatterySearch /\ 14500's /\ DiCal                                                       

aliang802
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teacher wrote:
Try using the “picture” icon (7th from left) at the top of the Comment box. That is all I know to tell you.???

I do not know why, with your method the results are blank after insert picture. If “Text format” is “Advanced Post Editor”, using the “insert/image” ,it’s ok and I can see it.

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

mattjk
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I cant see the pictures either.

teacher
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aliang802 wrote:
teacher wrote:
Try using the “picture” icon (7th from left) at the top of the Comment box. That is all I know to tell you.???

I do not know why, with your method the results are blank after insert picture. If “Text format” is “Advanced Post Editor”, using the “insert/image” ,it’s ok and I can see it.


???? OK ????? I just know I can’t see them. Maybe someone who knows why will chime in. Smile

      You never know how a horse will pull until you hook him up to a heavy load. / Paul "Bear" Bryant ~/~\~ "Slow is Smooth, Smooth is Fast"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||   Confucius say -- Baaa-haaaaaa......   tongue-out

         Rudeness Level /\ mΩ /\ {width:70%} /\ LightWiki /\ LED Tint Chart /\ LED Tint Picture /\ Xlamp size chart /\ BatteryU                   Flashaholic? Need Professional Help???   wink   /\ TheOriginal /\ TAB /\ LightSearch /\ BatterySearch /\ 14500's /\ DiCal                                                       

aliang802
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mattjk wrote:
I cant see the pictures either.

 

Do you know the reason for it?

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

Xoden
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aliang802 wrote:

As the saying goes, musket to kill a butterfly.
Of course, money can’t buy you happy, imainly depends on your mood…

How philosophical. Hat
aliang802 wrote:

Really? Then how can I do it?
But I can see the picture I sent.

Where they are located (the images themselves)?
Maybe you should try uploading them at some public image hosting, like Imgur.
aliang802
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aliang802 wrote:
Really? Then how can I do it? But I can see the picture I sent.
Where they are located (the images themselves)? Maybe you should try uploading them at some public image hosting, like Imgur.[/quote]

 

Image is located in my 360 cloud disk. Curiously, I can see my picture on the forum, but you can't.

 

 

Good at designing and making MCPCB of thermoelectric separation! My email is brightchen802@163.com.

DavidEF
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aliang802 wrote:

 

aliang802 wrote:
Really? Then how can I do it? But I can see the picture I sent.
Xoden wrote:
Where they are located (the images themselves)? Maybe you should try uploading them at some public image hosting, like Imgur.

 


Image is located in my 360 cloud disk. Curiously, I can see my picture on the forum, but you can’t.


 


 


If that’s the case, it might be a permissions issue. Try logging yourself out of your 360 cloud disk and load this page again and see if you can see the pictures. I know I can’t see them.

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

Rufusbduck
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Can’t see them either. When you do load them using the picture icon set image size to 100% rather than pixels x pixels. This automatically sets the size to match the page.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

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DB Custom wrote:
I’m still thinking about ordering a 12mm wide man made diamond to put a hot emitter on top of…

With all the not so subtle hints I keep getting from my girlfriend about something called an engagement ring (huh?), if I did that, I’d have to sleep with one eye open.
Rufusbduck
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A couple of years ago one of our members(PilotPTK) with input from others here designed the 16mm copper sinkpad which they then produced so it’s been known of and used here extensively for some time. What I don’t understand is why sinkpad puts such narrow traces on their other boards.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

hank
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Here’s what your attempt to add images looks like (/View/Source in the browser)

I did that by

1) hilighting everything across one of your responses that looked like it contains a picture I wasn’t seeing.
2) using /View/Source in the browser

so that’s the code that isn’t working for others to see — probably security problems about going out and running scripts

I got that by doing what you can do that will work to post images.
First catch your image

3) taking a screenshot of what I saw there
4) opening a free account at the free image hosting site tinypic.com
5) uploading the screenshot
6) copying out of the displayed HTML the URL for the screenshot at tinypic (without all their ancillary baggage)
7) coming to the simple post editor at BLF here
and clicking the “sunset picture” icon at top of Comment box

8) pasting the URL for the tinypic image into the first line
9) choosing 100%
10) I should have put the Tinypic site URL or something into the bottom line to add an “alt” clickable link to their site
11) clicking OK to insert the screenshot

Simple. Poke around and find a free image hosting site that you can upload images to, if there is one.
Assuming you’re behind the great firewall, we can’t really guess what sites you are permitted to see and use.

BrianK
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Has anyone ever tried a carbon fiber MCBPC? It’s non conductive to electricity and conducts heat like mad. It’s absolutely incredible when wrapped around a rifle barrel and the magic that it accomplishes there. Cost? I have no idea.

RobertB
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BrianK wrote:
Has anyone ever tried a carbon fiber MCBPC? It’s non conductive to electricity and conducts heat like mad. It’s absolutely incredible when wrapped around a rifle barrel and the magic that it accomplishes there. Cost? I have no idea.

Carbon fiber is kind of hard to solder to, no?

BrianK
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Well yeah, but layers can be added to it, No? Layers that conduct, No? Technology progresses, No? At one time the earth was flat and to consider anything other was heresy, No?

As I wrote I have no idea as to the cost. But prices come down and things become doable.

As already written, carbon is an excellent conductor of heat, but it doesn’t need to be diamond. It just takes vision, yeah?

RobertB
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BrianK wrote:
Well yeah, but layers can be added to it, No? Layers that conduct, No? Technology progresses, No?

Probably not, no?

BrianK
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We’d still be swingin’ from trees, no?

RobertB
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BrianK wrote:
We’d still be swingin’ from trees, no?

Carbon fiber mat would conduct heat well, but in order to have a solid non flexible disk, you would have to have some sort of epoxy resin. I wouldn’t think epoxy resin would conduct heat too well. Maybe I’m wrong, no?

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