High-power LED lamp heat dissipation performance optimization program
Optimization of heat dissipation structure
To optimize the heat dissipation structure of high-power LED lamps, the fin structure must first be optimized. According to the data and results of the simulation model, the height and length of the fins are analyzed. Generally speaking, the ceramic height of high-power LED lamps is usually 0.05- In the range of 0.11m, the heat dissipation performance in this range is the best. It can be further divided in the range of 0.05-0.11m. Generally speaking, in the range of 0.071-0.11m, when the fin height reaches this height, The chip temperature tends to be flat, and in the range of 0.05-0.07m, when the fin height is within this range, the chip temperature fluctuates greatly, so the height range of the fin should be controlled to obtain higher chip heat dissipation performance . In addition, in terms of fin length, the most suitable range is 0.03-0.12m, which is also the first choice for fin lengths such as high-power LEDs.
On the other hand, the gaps and through holes are the connection channels of the light source area of the LED lamp, and the LED substrate is the place with the highest temperature in the entire lamp. This shows that the heat transmission channel of the LED lamp starts from the chip and goes to the gap and through hole. The substrate, and for other excess heat, is mainly removed through the heat sink channel. In this way, according to the specific situation of the high-power LED lamp, the internal structure and module of the LED lamp can be modified to find and measure the optimal solution. Realize the data statistics of heat distribution, so as to formulate the parameters of notches and through holes according to the actual situation, and the number of fins is generally set according to 12-16, mainly the highest value of fin heat dissipation is calculated, and the combination of fins The method of setting the distance and spacing increases the maximum value of heat dissipation, and realizes the high performance of fin heat dissipation at one time.
1.1Material selection
The selection of LED lamp materials is very important. It is necessary to analyze the working environment and heat dissipation requirements of high-power LED lamps, and continue to expand new high-performance heat dissipation materials. [3] At present, the heat dissipation materials of high-power LED lamps are mainly silver, aluminum, and aluminum alloys, supplemented by other new materials. First of all, traditional silver, aluminum, aluminum alloy and other materials are relatively cost-effective, so they are widely used in the market. Traditional heat dissipation materials mainly have differences in thermal conductivity, and thermal conductivity and heat dissipation efficiency show a positive correlation. According to the thermal conductivity of mines, the thermal conductivity of silver is the highest, which determines that it can effectively reduce the surface thermal resistance and improve the overall thermal conductivity. However, from the cost point of view, the purchase cost of silver is relatively high, and from the perspective of its performance, the flexibility of silver Insufficient performance and insufficient hardness. Therefore, at present, aluminum, aluminum alloy and copper are the main materials for high-power LEDs. The existing LEDs usually use aluminum as the main material for heat dissipation, and some copper will be added appropriately, which is relatively cost-effective. In addition, in recent years, the development of new LED heat dissipation materials has also been continuously improved, and new heat dissipation materials have also made great progress, further expanding the application of LED lights in different working environments, such as MAP-05 heat dissipation material suitable for high temperature and low pressure It is a very good development direction. In addition, with the development of electronic equipment and the changes in the working environment of high-power LED lamps, the performance and shape of heat dissipation materials have been continuously introduced, and great progress has been made.
1.2 Performance optimization
The performance of high-power LED lights must be optimized before design and production. Temperature experiments and data statistics must be done to design products with the most optimized performance in different work scenarios. In the test process, the performance optimization of high-power LED lights must be set according to the working performance of the test environment, equipment, etc., and the optimal solution must be found through the simulation test. During the test, the temperature must be kept constant and the most simulated Optimizing the results of the LED lights in a good state, so as to adjust the performance, and achieve the optimization of performance through the adjustment of materials and structures. At present, high-power LED lights are designed to perform temperature tests to test the specific performance of LED lights. Of course, the test results will have a certain deviation, but the overall data distribution law is not much different. If the data distribution law is different, you need Rethink whether there are other problems in the simulation, such as the temperature is not constant, the voltage line is unstable, etc.
