Development direction of LED heat dissipation technology
As we all know, LED lamps need good heat dissipation conditions to ensure the normal use and service life of LED. The heat dissipation of LED lighting has always been the most difficult castle in the industry. Which direction will LED heat dissipation technology develop in the future?
Active cooling:
By adding micro fan and increasing convective heat dissipation, the node temperature of LED can be effectively reduced.
Advantages: the heat dissipation effect is remarkable, because the heat dissipation of LED lamp mainly depends on convective heat dissipation, accounting for about 80%
Disadvantages: A. noise: there will be noise after adding the fan, which may affect the normal work, rest and entertainment. B. service life: the bearing life of the general fan is difficult to reach the long service life of 100000 hours as that of the LED lamp. C. cost: increasing the active heat dissipation will increase the product cost accordingly. In particular, long-life micro fans are installed.
Passive cooling:
Increase radiation and convective heat dissipation through the design of LED lamp heatsink materials and structures.
Advantages: low mute cost
Disadvantages: the heat dissipation effect depends on the structural design of the radiator and requires more mature design technology.
Advantages and disadvantages of materials for LED heatsink:
Aluminum
Advantages: at present, the mainstream in the market is to use aluminum casting heat sink for heat dissipation, which is characterized by low cost, light weight, good heat dissipation performance, not easy to be corroded by the environment and wear-resistant.
Disadvantages: poor insulation. If a circuit board (such as LED bulb and lamp tube) is installed in the heat sink, additional insulation measures shall be taken to prevent electric shock accident or lamp damage caused by circuit board short circuit; the heat dissipation volume is large, which is not conducive to product miniaturization;
Ceramic heat dissipation:
The price is relatively low, corrosion resistance and good insulation performance. If there is a circuit board installed inside the heat sink, it does not need too much insulation treatment to meet the safety performance requirements of the product. However, the heat dissipation performance is worse than that of aluminum radiator; and it is east to broken.
Copper
Its thermal conductivity is good. For the heatsink with the same volume, copper can bear the heat dissipation demand of higher power LED than aluminum, which is conducive to the miniaturization of products. However, the insulation of copper is poor and additional insulation treatment is required; The price is higher.
