Thermal part: Circuit substrate, caulking material, housing material Heat sink part: Shell design, surface design, surface material Next, Xiaobian compiled the advantages and disadvantages of these materials, you are welcome to join to discuss. Thermal part Circuit substrate Fiberglass board advantage: Low cost and easy to make No need to consider insulation properties Disadvantages: Not suitable for LED design with heat sink and electrode Need to fill the hole with tin, increase the process Thick copper foil layer is needed to increase heat transfer efficiency Aluminum plate advantage: Generally accepted Harder than FR4, better thermal conductivity with heat sink Electrical insulation is higher than fiberglass board Disadvantages: The price is higher than FR4 Less able to place other electronic components on the substrate The thermal conductivity of the insulation layer is difficult to grasp Copper substrate advantage: Thermal conductivity is much higher than aluminum substrate Low specific heat value, easier to pull up the conduction temperature Same advantages as aluminum substrates Disadvantages: High cost, general design is not applicable Has the same disadvantages as aluminum substrates Common gold plate advantage: The conduction center is unobstructed and the thermal conductivity is good. Substrate application for high power polycrystalline LEDs Disadvantages: Not suitable for heat sink with electrode LED application cost is too high Not applicable to 1~5W power applications High mold opening cost Composite board advantage: The highest thermal conductivity, up to 500W/mK High heat rejection, no heat left on the body Disadvantages: Production is difficult, and the processing procedure is difficult Poor material stability, doubts about long-term use The cost is too high, it is difficult to commercialize mass production Joint filler Thermal paste advantage: Low cost and easy to use No specific processing Disadvantages: Not easy to apply evenly, easy to form bubbles Long-term stability of the product, easy to cure, and curing Thermal barrier It is easy to cause pollution to other parts during processing, increasing costs Silicone pad advantage: Long temperature resistance, temperature resistance 125~200°C The higher the temperature, the better the thermal conductivity Flexible, not easy to form bubbles Disadvantages: High cost and increased product cost Higher thickness, generally above 0.3mm Thermal phase change silicone pad Thermal phase change silicone pad advantage: Product advantage with general silicone pad At high temperatures, the silicone will soften to increase the caulking effect. Increase thermal conductivity Disadvantages: Not easy to post-process, and can not be used twice Higher cost and increased product cost Housing material Aluminum-extruded (pull-up) advantage: High thermal conductivity and fast heat transfer Low mold cost and length can be cut freely Easy to process Disadvantages: Hardness / steel is insufficient The appearance is relatively unchanged, and the aesthetic design is not easy Fins dissipate heat, which is more likely to cause dust accumulation Aluminum - die casting advantage: Appearance can be arbitrarily changed to beautify the appearance Can be mass produced quickly Disadvantages: High mold design and development costs Long development time, not easy to modify the design Thermal plastic advantage: High insulation performance Light weight Easy mass production Disadvantages: Need to develop molding molds, high cost and long time Poor thermal conductivity, high thermal resistance of the whole lamp system, unfavorable LED life Plastic aluminum composite advantage: Can reduce the thermal resistance of the system relatively, increase the life of the LED light source, and not reduce the insulation Disadvantages: Complex production process, increasing production costs Increase product weight Heat sink Shell design The fin design increases 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 fins need to be different. Surface design The surface can be roughened to increase the surface area; The side fins of the columnar body can be increased to increase the effective surface area. Surface material Optional anodizing treatment, pay attention to its applicable temperature; Optional high heat exchange efficiency material spraying; Avoid mirror finishes. Cummins 21-75KW Diesel Generator Cummins 21-75Kw Diesel Generator,Cummins Power Generator,Cummins Shanghai Power Generator Set,Cummins Generator Shanghai Kosta Electric Co., Ltd. , https://www.shkostagenerator.com