Analysis of heat dissipation performance and optimization scheme of high-power LED lamps
The heat dissipation performance of high-power LED lamps is mainly completed by optimizing the heat dissipation structure and heat dissipation materials. In the process of LED design, it is necessary to consider the specific working environment, select the best heat dissipation materials, and do simulation experiments to adjust the structure of the LED lamp to ensure the high heat dissipation performance of the LED lamp.
1. Optimization of heat dissipation structure
To optimize the heat dissipation structure of high-power LED lamps, we must first optimize the fin structure. Based on the data and results of the simulation model, the fin height and length were analyzed. Generally speaking, the height of high-power LED lights is usually in the range of 0.05-0.11 meters, and the heat dissipation performance is excellent. It can be further divided into 0.05-0.11m, usually 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. Therefore, the height range of the fins should be controlled to obtain higher chip heat dissipation performance. In addition, the fin length is 0.03-0.12m, which is the best in the length of high-power LED fins.
On the other hand, the slits and through holes are the connection channels of the LED light source area, and the LED substrate is the place with the highest temperature in the whole lamp. This shows that the heat transmission channel of the LED lamp starts from the chip, to the gap and through hole, and then to the substrate, and other excess heat is mainly removed through the heat dissipation channel. In this way, according to the specific situation of the high-power LED lamp, the internal structure and modules of the LED lamp can be modified. The number of fins is generally set at 12-16 pieces, mainly to calculate the maximum heat dissipation value of the fins, and increase the maximum heat dissipation value through the fin combination and spacing setting, so as to achieve the high heat dissipation performance of the fins at one time. .
2. Material selection
The choice of LED material is very important. It is necessary to analyze the working environment and heat dissipation requirements of high-power LED lamps, and constantly develop new high-performance heat dissipation materials. 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 cost-effective, so they are widely used in the market. Traditional heat dissipation materials mainly differ in thermal conductivity, which is positively related to heat dissipation and conduction efficiency. From the perspective of thermal conductivity, silver has the highest thermal conductivity, which determines that it can effectively reduce the surface thermal resistance and improve the overall thermal conductivity. However, in terms of cost, the purchase cost of silver is relatively high, and in terms of performance, the elasticity and hardness of silver are insufficient. Therefore, the main materials for high-power LEDs are aluminum, aluminum alloys and copper. Existing LEDs usually use aluminum as the main heat dissipation material, and some copper will be added appropriately, so the cost performance is relatively high. In addition, in recent years, the development of new LED heat dissipation materials has been continuously improved, and new heat dissipation materials have also made great progress, further expanding the application of LED lamps in different working environments, such as MAP-05 heat dissipation materials suitable for high temperature and low pressure, It is a good development direction. In addition, with the development of electronic equipment and changes in the working environment of high-power LED lamps, the performance and shape of heat-dissipating materials are constantly being updated, and great progress has been made.
3. Performance optimization
Before the design and production of high-power LED lamps, performance optimization must be carried out, temperature experiments and data statistics must be done, so as to design products with optimized performance in different working scenarios. During the test process, the performance optimization of high-power LED lamps must set up the test environment and equipment according to the working performance, and find the best solution through the simulation test. During the test, keep the temperature constant, simulate the best result of the LED lamp in the best state, adjust the performance and optimize the performance by adjusting the material and structure. At present, high-power LED lamps are designed with temperature tests to test the specific performance of LED lamps. Of course, there will be some deviations in the test results, but the overall data distribution law is not much different. If the data distribution law is quite different, it is necessary to reflect on whether there are other problems such as unstable temperature and unstable voltage line in the simulation.
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