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What are the main things that our commonly used high-power LED lights need?
by：ALLTOP
2021-04-07
In the application process of high-power LED products and devices, electrostatic protection, heat dissipation, and welding have a great impact on their characteristics, and they need to be highly valued by application-side customers.
1. The electrostatic protection of high-power LED products
LED is a semiconductor device, which is more sensitive to static electricity, especially for white, green, blue, and purple LEDs to prevent and eliminate static electricity.
.The generation of static electricity:
①Friction: In daily life, any two objects of different materials contact and then separate, and static electricity can be generated. The most common method of generating static electricity is to generate electricity by friction. The better the insulation of the material, the easier it is to generate electricity by friction. In addition, any two objects of different materials can be separated after contacting them, which can also generate static electricity.
②Induction: For conductive materials, because electrons can flow freely on its surface, if it is placed in an electric field, the positive and negative ions will be transferred due to the repulsion of the same sex and the attraction of the opposite sex. Will generate electric charge.
③ Conduction: For conductive materials, because electrons can flow freely on its surface, such as contact with a charged object, charge transfer will occur.
.The harm of static electricity to LED:
① Due to the heat generated by the instant electric field or current, the LED is locally injured. The leakage current increases rapidly and can still work, but the brightness is reduced and the life span is damaged.
②Due to the electric field or current destroying the insulating layer of the LED, the device cannot work (completely destroyed), and it appears as a dead light.
.Static protection and elimination measures:
For the entire process (production, testing, packaging, etc.) all employees who are in direct contact with LEDs must take measures to prevent and eliminate static electricity, mainly including
, Lay anti-static floor in the workshop and do a good job of grounding.
, The workbench is an anti-static workbench, and the production machine is well grounded.
, the operator wears anti-static clothes, anti-static wristbands, gloves or foot rings.
, Application of ion fan.
、Welding electric iron to do grounding measures.
, The packaging is made of anti-static materials.
2. Heat dissipation of high-power LED products:
Due to the limitations of the current semiconductor light-emitting diode chip technology, the photoelectric conversion efficiency of LEDs needs to be improved, especially for high-power LEDs, because of their higher power, about% of the electrical energy will be released as heat (as semiconductor technology The development of photoelectric conversion efficiency will gradually increase), which requires end customers to do a good job of heat dissipation when applying high-power LED products to ensure that high-power LED products work normally.
. Heat sink requirements
Appearance and material: If the sealing requirements of the finished product are not high, it can directly convection with the outside air environment. It is recommended to use finned aluminum or copper heat sinks.
. Effective heat dissipation surface area:
For W high-power LED white light (other colors are basically the same), our company recommends the total effective heat dissipation surface area of u200bu200bthe heat sink ≥-square centimeter. For W products, it is recommended that the total effective heat dissipation surface area of u200bu200bthe heat sink is ≥ square centimeters. Higher power depends on the situation and test results. Try to ensure that the temperature of the heat sink does not exceed ℃.
.Connection method:
When connecting the high-power LED substrate and the heat sink, please ensure that the two contact surfaces are flat and in good contact. In order to strengthen the combination of the two contact surfaces, it is recommended to coat the bottom of the LED substrate or the surface of the heat sink with a layer of thermal grease (thermal silicon Grease thermal conductivity ≥.W/mk), thermal conductive silicone grease should be applied evenly and in an appropriate amount, and then fixed with screws.
3. Welding of high-power LED products
, Please pay attention to the best choice of constant temperature soldering iron when soldering, the soldering temperature is below ℃, and the contact time between the soldering iron and the LED pad should not exceed S;
. For high-power LEDs packaged in silicone, the highest heat-resistant temperature of silicone is ℃, so the soldering temperature of the LED should not exceed ℃, use low-temperature soldering iron and low-temperature solder paste (wire) soldering, soldering iron and LED pad once The contact time does not exceed S.
1. The electrostatic protection of high-power LED products
LED is a semiconductor device, which is more sensitive to static electricity, especially for white, green, blue, and purple LEDs to prevent and eliminate static electricity.
.The generation of static electricity:
①Friction: In daily life, any two objects of different materials contact and then separate, and static electricity can be generated. The most common method of generating static electricity is to generate electricity by friction. The better the insulation of the material, the easier it is to generate electricity by friction. In addition, any two objects of different materials can be separated after contacting them, which can also generate static electricity.
②Induction: For conductive materials, because electrons can flow freely on its surface, if it is placed in an electric field, the positive and negative ions will be transferred due to the repulsion of the same sex and the attraction of the opposite sex. Will generate electric charge.
③ Conduction: For conductive materials, because electrons can flow freely on its surface, such as contact with a charged object, charge transfer will occur.
.The harm of static electricity to LED:
① Due to the heat generated by the instant electric field or current, the LED is locally injured. The leakage current increases rapidly and can still work, but the brightness is reduced and the life span is damaged.
②Due to the electric field or current destroying the insulating layer of the LED, the device cannot work (completely destroyed), and it appears as a dead light.
.Static protection and elimination measures:
For the entire process (production, testing, packaging, etc.) all employees who are in direct contact with LEDs must take measures to prevent and eliminate static electricity, mainly including
, Lay anti-static floor in the workshop and do a good job of grounding.
, The workbench is an anti-static workbench, and the production machine is well grounded.
, the operator wears anti-static clothes, anti-static wristbands, gloves or foot rings.
, Application of ion fan.
、Welding electric iron to do grounding measures.
, The packaging is made of anti-static materials.
2. Heat dissipation of high-power LED products:
Due to the limitations of the current semiconductor light-emitting diode chip technology, the photoelectric conversion efficiency of LEDs needs to be improved, especially for high-power LEDs, because of their higher power, about% of the electrical energy will be released as heat (as semiconductor technology The development of photoelectric conversion efficiency will gradually increase), which requires end customers to do a good job of heat dissipation when applying high-power LED products to ensure that high-power LED products work normally.
. Heat sink requirements
Appearance and material: If the sealing requirements of the finished product are not high, it can directly convection with the outside air environment. It is recommended to use finned aluminum or copper heat sinks.
. Effective heat dissipation surface area:
For W high-power LED white light (other colors are basically the same), our company recommends the total effective heat dissipation surface area of u200bu200bthe heat sink ≥-square centimeter. For W products, it is recommended that the total effective heat dissipation surface area of u200bu200bthe heat sink is ≥ square centimeters. Higher power depends on the situation and test results. Try to ensure that the temperature of the heat sink does not exceed ℃.
.Connection method:
When connecting the high-power LED substrate and the heat sink, please ensure that the two contact surfaces are flat and in good contact. In order to strengthen the combination of the two contact surfaces, it is recommended to coat the bottom of the LED substrate or the surface of the heat sink with a layer of thermal grease (thermal silicon Grease thermal conductivity ≥.W/mk), thermal conductive silicone grease should be applied evenly and in an appropriate amount, and then fixed with screws.
3. Welding of high-power LED products
, Please pay attention to the best choice of constant temperature soldering iron when soldering, the soldering temperature is below ℃, and the contact time between the soldering iron and the LED pad should not exceed S;
. For high-power LEDs packaged in silicone, the highest heat-resistant temperature of silicone is ℃, so the soldering temperature of the LED should not exceed ℃, use low-temperature soldering iron and low-temperature solder paste (wire) soldering, soldering iron and LED pad once The contact time does not exceed S.
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