High-power LED Lamp Beads

In the application process of high-power LED products and devices, heat dissipation, electrostatic protection, and welding have a great influence on their characteristics, and they need to be highly valued by application-side customers.
Heat dissipation
Due to the limitation of 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 60% of the electrical energy will be released as heat (with the development of semiconductor technology, The 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 the normal operation of high-power LED products.
1. 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.
2. Effective heat dissipation surface area:
For 1W high-power LED white light (other colors are basically the same), it is recommended that the total effective heat dissipation surface area of the heat sink is ≥50-60 square centimeters. For 3W products, it is recommended that the total effective heat dissipation surface area of the heat sink is ≥150 square centimeters. Higher power depends on the situation and test results. Try to ensure that the temperature of the heat sink does not exceed 60°C.
3. 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 conductivity of thermal grease) ≥3.0W/mk), thermally conductive silicone grease shall be applied evenly and in an appropriate amount, and then fixed with screws.

welding
1. When soldering, please note that it is best to choose a constant temperature soldering iron, the soldering temperature is below 260℃, and the contact time between the soldering iron and the LED pad should not exceed 3S;
2. For high-power LEDs encapsulated by silicone, the maximum heat-resistant temperature of silicone is 180°C, so the soldering temperature of the LED should not exceed 170°C. Use low-temperature soldering iron and low-temperature solder paste (wire) for soldering, and the soldering iron is in contact with the LED pad at one time The time does not exceed 3S.