On The Advantages And Disadvantages Of The Design Materials For Thermal Conductivity And Heat Dissipation Of LED Lamps
- Jul 31, 2018 -

Thermal conductivity:


Wire substrates, caulking materials, shell materials  (LED High Bay Light)



Cooling part:


Shell design, surface design, surface materials



Next, we have sorted out the advantages and disadvantages of these materials. You are welcome to join us. (LED High Bay Light)




Part of thermal conductivity



Line board



Glass fiber board




Advantages:


It's cheap and easy to make


Insulation characteristics are not considered



Disadvantages:


LED design with electrode on heat sink is not applicable


The hole should be filled with tin to increase the process


The copper foil layer should be thickened to increase the heat conduction efficiency (LED High Bay Light)




Aluminum plate




Advantages:


General acceptance is high (LED High Bay Light)


The hardness is higher than FR4, and the thermal conductivity of heat dissipation shell is better


Electrical insulation is higher than glass fiber board (LED High Bay Light)



Disadvantages:


The price is higher than FR4 (LED High Bay Light)


Other electronic components cannot be placed on the substrate (LED High Bay Light)


The thermal conductivity of insulation layer is not easy to master (LED High Bay Light)




Copper substrate




Advantages:


Thermal conductivity is much higher than aluminum substrate (LED High Bay Light)


Lower than the heat value, easy to pull up the conduction temperature (LED High Bay Light)


It has the same advantages as aluminum substrate (LED High Bay Light)



Disadvantages:


High cost, general design is not applicable (LED High Bay Light)


Have the same defects as aluminum substrate (LED High Bay Light)




A total of gold plate





Advantages:


There is no blocking in the conduction center, and the thermal conductivity is good (LED High Bay Light)


It can be applied to the substrate application of high power polycrystalline LED



Disadvantages:


LED applications that are not suitable for radiator with electrode are too expensive


Not applicable to 1~5W power applications (LED High Bay Light)


High opening cost




Composite sheet




Advantages:


The thermal conductivity is the highest, up to 500W/mK


High thermal repulsion, leaving no heat energy in the body



Disadvantages:


Manufacturing is not easy, processing is difficult (LED High Bay Light)


Poor material stability, long - term use of doubt (LED High Bay Light)


The cost is too high to be commercialized in mass production (LED High Bay Light)




Caulking materials




Thermal conductive paste



Advantages:


Low cost, easy to use


No specific process



Disadvantages:


Not uniform coating, easy to form bubbles (LED High Bay Light)


The product is unstable for a long time, easy to solidify and solidify

 (LED High Bay Light)

And then you have a thermal barrier (LED High Bay Light)


It is easy to pollute other parts and increase the cost (LED High Bay Light)



The silicone pad



Advantages:


Long time temperature resistance performance is good, can withstand temperature


125 ~ 200 ° C


The higher the temperature, the better the thermal conductivity


It is elastic and not easy to form bubbles



Disadvantages:


High cost, increase product cost


The thickness is high, generally over 0.3mm


Hot phase change silicone pad



Hot phase change silicone pad



Advantages:


It has the advantages of general silicone pad products (LED High Bay Light)


The silicone will soften at high temperature to increase the sealing effect and 


Increase thermal conductivity



Disadvantages:


It is not easy to be processed after processing and cannot be used again


High cost, increase product cost




The shell material




Aluminum - extruded (pull up)




Advantages:


High thermal conductivity, high heat transfer speed


The mould cost is low and the length can be cut at will


Easy to make



Disadvantages:


Less hardness/rigidity


The appearance is relatively unchanged, and the aesthetic design is not easy


Fin heat dissipation, easy to cause dust accumulation



Aluminum - die casting




Advantages:


The appearance can change at will, beautify the appearance


Can be mass rapid production



Disadvantages:


Mold design and development costs are high


Long development time, not easy to modify the design



Thermal conductive plastic


Advantages:


High insulation performance


Light weight


Easy to mass produce


Disadvantages:


Need to develop molding mould, high cost, long time


Poor thermal conductivity, high thermal resistance and poor LED life



Plastic-aluminium composite


Advantages:


It can reduce the thermal resistance of the system, increase the life of LED light source, and not reduce the insulation



Disadvantages:


The production process is complex, increasing the production cost


Increase product weight



The cooling part



The shell design



Fin design can increase the effective heat dissipation area;


Note the ratio of fin height to fin spacing;


Note the ratio of fin height to fin thickness;


Note that the width of the base and end of the fin should be different.



The surface design



The surface can be roughened to increase the surface area.


The lateral fin of the column can be increased to increase the effective surface area.



Surface material



Anodic oxidation treatment can be selected, and the applicable temperature should be noted.


High heat exchange efficiency materials can be selected for spraying;



Avoid mirror baking.