For the LED lighting design, if only relying on the LED package,the good lighting can’t be produced. This part mainly explain from the design of thermal to analysis how to use the LED characteristics. Although the energy loss of the incandescent and fluorescent is large, most of the energy directly radiate through the infrared, the light source generate less heat; the LED, in addition to the energy consumption as the visible light, other energy is converted into heat. In addition, because the packaging size of LED small,the heat dissipation by convection and radiation is less, which has accumulated a lot of heat. |
Thermal solution is simply to solve various problems caused by the heat. Are:
1 because the thermal expansion results in bending and cracking
The electronic equipment is made of multiple parts, each part of the material is different, the scale of thermal expansion and contraction is not the same. Therefore, when the various materials join together,it is possible to make the material bends, swelling, the product because of the stress at the joint will produce excessive cracking.
(2) barriers to the operation of the electronic circuit
In general, a semiconductor element as the heat source, there is such a characteristic that when the temperature of the electronic device of the semiconductor element rise, the electrical impedance becomes smaller. So it is easy to fall into the "temperature rise - impedance drops - current increase - increase in heat - the temperature rise," the vicious cycle, and thus prone to burnout phenomenon.
3 the quality of material deteriorate
In general, the materials used in electronic devices is easily oxidized, the higher the temperature,the faster the oxidation, if these materials is oxidized by the repeated high temperature, which will shorten its life. Also, repeated heating, repeated expanse, shrink times, will reduce the strength of the material, thereby destroying the material.
LED's thermal solution
There are many ways to prevent the electronic devices from generating heat. For example, add a radiator, place fan to provide air-conditioning around the heat source The former is by increasing the cooling area to increase the cooling channel, the latter is not make that the heat gather around. However, as shown in summarized figure 1 of LED lamp, LED package can not be directly connected to the radiator, there is not installed position for the fan. And the internal power supply and circuit board will generate heat, so the cooling problem of the LED lamps can be said to be a very difficult problem. Thus, how to effectively use the LED installation material and heat sink becomes very important.
So how to effectively use LED Mounting material and heat sink? We must first grasp the thermal heat transfer paths.
The Heat generated by the LED element moves to the circuit board through the packaging wire. Then release the heat through the heat sink,so do the heat generated by the circuit board of the power supply, through the ambient of air the board and filling material to depose the heat through the external heat sink.
What is important is that exclude that impede heat transfer path factors in the heat solution, such as the good thermal conductivity material can be considered using to expand cross-sectional area of the path in the heat transfer path (for example, thick is easier to conduct the heat than the thin copper wire), coat the thermal joints lubricant to make the product without leaving gaps.
In addition, the thermal characteristics is improved by these ways, but if the radiator does not depose the heat, there is still a lot of heat gathering inside. Therefore need to improve the surface characteristics of the heat sink. The typical method is to install a few more heat sinks on the surface, expand the exothermic area of the heat sink
The LED light is known as the high luminous efficiency, long life, not containing harmful substances, etc.. High luminous efficiency can increase battery life, which is more suitable for portable products.The life of LED light is generally 2 to 3 times more than incandescent lamp (Some data show that 40 times), because the use of long life LED, A typical example is the traffic lights. In addition, the response speed of the LED light is very fast, so it is suitable for the brake lights. The design freedom of LED lighting is very high, not only can adjust the brightness, but also adjust the color.
Meanwhile,there are a large number of excellent manufacturer engaging in manufacturing and researching the LED light,of which the lead lighting is just one,lead Lighting adopts high brightness SMD as the light source of the LED tube and highly integrated and high brightness COB as the light source of the LED flood light, which fully guaranteed stability and soft light of the LED tube light and octahedron breadth and brightness irradiation range of the LED flood light, while the low voltage constant current driver convert the AC into DC so that improve energy efficiency of the LED tube light and LED flood light and reduce the waste heat energy and stroboscopic effect exciting the human eye, the most important is that the LED lighting without adding mercury and other heavy metals harmful to our body and pollution the environment, that’s why the LED light is famous for energy-saving and environmental protection ,login www.ledclan.com to learn more features and uses of the LED tube light and surf www.lead-lighting.com to know more awesome LED floodlights and other LED lighting.
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AC, electronic equipment, Heat, heat sinks, LED flood light, light source, thermal expansion, tube light,