High Power LED Light Bead Heat And Other Matters Needing Attention And Several Types Of Introduction
Writer：Jane Time：2021-06-15 Browse：185
Many people are not clear about what is the need to pay attention to the material quality of high-power LED lamp beads in ordinary times. Today, we will explain the matters needing attention of high-power LED lamp beads, including the introduction of heat dissipation and other issues. Let's wait and see.
High power LED lamp bead several types of introduction and precautions
High power LED lamp bead several types of introduction
High power LED lamp bead is a kind of LED lamp bead. Compared with low power LED lamp beads, high power LED lamp beads have higher power, brighter brightness and higher price. The rated current of low-power LED beads is 20mA, and the rated current is higher than 20mA, which can basically be regarded as high power. The total power is 0.25W, 0.5W, 1W, 3W, 5W, 8W, 10W, etc. The main luminance unit is LM(Liu Ming), and the low-power luminance unit is usually MCD(Milton, 1CD=1000 MCD), namely, the luminance intensity I. High power lamp bead usually refers to the analog cavity bead, just like the shape of the image. SMD was higher than 20mA. It's not called high power.
1CD=1 LM/SR(lumens / 3d radians)=1 candle. Indicates that the luminous flux emitted by or emitted by the light source at the solid Angle Dω in the specified direction is D(I), which is the light intensity I(in candela, CD).
High power LED bead shell can be made of PC and can withstand high temperature of 135 degrees. PC tube manufacturing LED cover, the internal temperature can reach 135 degrees, the external temperature can resist 45 degrees without cracking.
As a new green energy saving light source, it is widely used in automotive lamps, flashlights, lamps and other fields. LED high power is called, mainly used for low power LED, classification standard I summed up three kinds: the first is based on the power size can be divided into 0.5W, 1W, 3W, 5W, 10W... 100W, according to the total power of the product after packaging is different.
The second category can be divided into large size epoxy resin packaging, fish scale type epoxy resin packaging, aluminum substrate (MPCBs) packaging, packaging, power type SMD packaging, MPCBs integrated packaging.
The third type can be divided into low light attenuation high power products and non-low light attenuation high power products, according to the degree of their light attenuation.
Of course, due to the large number of parameters of high-power LED itself, there are different classification standards according to different parameters.
LED high power is still one of the LED packaging products. In the field of general lighting, semiconductor lighting is the most important part.
High power LED lamp bead matters needing attention
In the application process of high power LED products and devices, heat dissipation, electrostatic protection and welding have a great impact on their characteristics, which need to be paid attention to by customers.
The heat dissipation body
Due to the limitation of semiconductor light-emitting diode chip technology, the photoelectric conversion efficiency of LED needs to be improved, especially the high-power LED. Due to its high power, more than 60% of the electric energy will be released as heat energy (with the development of semiconductor technology, the photoelectric conversion efficiency will gradually improve), which requires the end customer to apply huge work. When LED products are sold, heat dissipation must be carried out to ensure the normal operation of high-power LED products.
1. Radiator requirements.
Appendance and material: if the finished product sealing requirements are not high, can be directly with the outside air convection. Finned aluminum or copper radiators are recommended.
2. Effective heat dissipation area:
For 1W high-power LED white light (other colors are basically the same), the recommended heat sink has an effective heat dissipation area greater than 50-60 square centimeters. For 3W products, it is recommended that the total surface area of the heat sink be greater than 150 square centimeters, and improve the power view and test results, and that the temperature of the heat sink be not greater than 60.
3. Connection method:
When the high-power LED substrate is connected to the heat sink, make sure that the two contact surfaces are smooth and in good contact. In order to enhance the degree of bonding between the two contact surfaces, it is recommended to apply a layer of thermal conductivity silicone grease (the thermal conductivity of silicone oil is greater than 3.0W/ mK) on the surface of the LED substrate or the radiator and heat it. The conductivity of silicone grease should be uniformly applied, and then the screw should be pressed down and fixed.
Electrostatic protection
LED is a semiconductor device. It is sensitive to static electricity. Especially for white, green, blue and purple LEDs, we must prevent static electricity generation and eliminate static electricity.
1. Static electricity generation:
(1) Friction: In everyday life, any two different substances can be separated after contact, and then generate static electricity. The most common way to generate static electricity is FRIC.
The above content is some common problems of high-power LED lamp beads, we must have a certain understanding of the high-power LED lamp beads, if you want to know more about LED lamp beads information, please pay attention to pan-science and technology.
