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As a new type of green light source in the 21st century, LED lighting is widely used in modern society. It can be seen everywhere from street lamps and signal lamps in public places, to chandeliers and projection lamps in daily home decoration, and even the backlights of mobile phones and computers. Figure.

LED (Light Emitting Diode) is a commonly used optoelectronic device that can convert electrical energy into light energy. However, it generates a lot of heat energy during the lighting process, which affects the performance and life of the lamp. Therefore, the heat dissipation problem has become a shortcoming restricting the further development of LED lighting technology.

This issue of the European Classroom will introduce you to different types of LED heat sinks, and provide solutions to heat dissipation problems for you to use LED lighting in different application scenarios.

The effect of the heat generated by the LED on the product

Unlike traditional lighting, the LED light source itself has no radiant heat dissipation function, so the heat generated by the work is easy to accumulate in the cavity of the lamp, which brings a series of problems to the use of the product:

Reduced luminous efficiency;

The light is redshifted;

Forward voltage drop;

Increase in reverse current;

Increased thermal stress;

The service life of the device is shortened;

The correlated color temperature of white light increases, and the correlated color temperature of other colors decreases;

This leads to deterioration of the phosphor, epoxy resin and other materials encapsulated in the LED lamp.

Aluminum alloy radiator uses metal aluminum as the main material, which has high thermal conductivity, small specific gravity, easy processing and low price. However, it is not insulated by itself. Insulating glue or insulating sleeves need to be added for safety, which increases the cost and is also not conducive to heat dissipation.

#2

Plastic-clad aluminum radiator

Plastic-clad aluminum radiator is a heat-conducting plastic shell aluminum core radiator. The advantage is that it has good insulation performance and is easy to pass safety regulations. The heat of the LED is quickly transferred to the thermally conductive plastic through the aluminum heat dissipation core, and the thermally conductive plastic uses its multi-wings to form air convection heat dissipation, and uses the surface to radiate part of the heat.

Plastic-clad aluminum radiators are generally composed of two parts: thermally conductive plastic and embedded aluminum parts. The thermally conductive plastic wrapped in the outer layer solves the problem of non-insulation of aluminum alloy radiators. However, since the current price of high thermal conductivity plastics is not low, the production cost is also high, and they are usually used for lower power LED lamps.

#3

High thermal conductivity plastic radiator

The high thermal conductivity plastic radiator is a kind of all-plastic radiator. Its thermal conductivity is as high as 2-9w/mk. It has excellent heat conduction, heat radiation and insulation capabilities. It can be widely used in various LED lamps from 1W to 200W.

Advantages of high thermal conductivity plastic radiator:

One-time molding, the finished product has high finish;

Significantly improve production efficiency and high flexibility in modeling design;

It is polymerized by PLA, which meets global environmental protection requirements;

The densely distributed nano-scale metal ions between PLA molecules can increase the heat radiation energy;

High temperature resistance, suitable for fluorescent tubes and high-power industrial and mining lamps;

A lot of precise cooling wings can be designed, and the heat dissipation area is expanded to the maximum, and the heat dissipation effect is better;

The density is lighter than aluminum, and the weight of a plastic radiator with the same shape is only 1/2 of that of aluminum;

The processing is simple and the cost is low.

At present, the heat dissipation problem of LED lighting is still an urgent technical problem to be overcome. Therefore, people are constantly looking for heat dissipation materials that are easy to use, good thermal conductivity, and low cost to design lamps and lay the foundation for the mature development of LED lighting.