LED lighting technology inheritance and breakthrough: overcome the thermal fortress

I. Inheritance and breakthrough: Conquering the thermal fortress

According to the reporter, in 2010, with more than 180 self-developed patented technology of domestic famous brands electrical and mechanical cooling PCCooler Technology Co., Ltd. strong attack LED market, promote the new concept of LED heat sink. At present, the luminous efficiency of LEDs is still low, which causes the junction temperature to rise and the lifetime to decrease. In order to reduce the junction temperature to improve the life, the heat dissipation problem is extremely critical. The heat dissipation design of the LED must be from the beginning of the chip to the entire heat sink, and every link must be highly valued. Neglecting any part of the design will cause serious heat dissipation problems. In the past, LED street lamps suffered a large number of failures in long-term work, half of which was caused by lack of heat dissipation design, and the other half was caused by power failure. Therefore, the design of heat dissipation must be given full attention.

According to Du Jianjun, the product technology of Overclocking III is passed down from the traditional CPU cooling and improved. Overclocking three has reached the first place in the PC cooling market. The principle and foundation of LED cooling and CPU cooling are the same. It is necessary to solve the problem of deriving and dissipating the heat dissipated by the chip; all solving the heat dissipation problem with the chip as the heat source, so the overclocking three inherits the advantages of the PC heat dissipation technology , and invents a series of heat dissipation technologies such as heat pipe riveting to solve the problem of high-power LED heat dissipation. problem;

Du Jianjun said that with the inheritance of technology, the products cannot be separated from the vigorous investment in R&D and innovation. The focus of the overclocking three companies in 2011-2012 has been invested in product research and development. At the end of 2012, overclocking three industrial and mining lamp floodlights The single high-power LED radiator used in the Guangdong Province won the award for the product technology selection of the “Province Cup” in Guangdong Province. However, due to the fact that the company’s focus is not on marketing, the sales of the products for the whole year of 2012 are general. In 2013, overclocked three LED products were recognized by the industry. Du Jianjun said that in the first quarter of this year, overclocking three LED radiator products revenue reached tens of millions of yuan. The company is full of confidence in this year's situation. "The overall momentum this year is good. We strive to achieve a 5-8 times increase in the year-end results compared with the same period last year." Du Jianjun said with confidence.

1. Application of inventing heat pipe technology in heat dissipation of high power LED

Du Jianjun introduced the heat pipe technology in 1963, the Los Alamos National Laboratory invented the heat pipe, mainly used in aerospace, military. Using the principle of heat conduction, the closed casing is filled with a working medium and heat exchange is performed by utilizing the phase change endothermic and exothermic of the medium. Thermal conductivity exceeds any known metal. Overclocking three invented the heat pipe riveting fin technology, the heat pipe uses the vapor and liquid phases of the internal medium to change heat conduction, and the high-density heat flow is transmitted from the LED light source to the fin. Large-area fins dissipate heat, quickly reducing the temperature of the light source and extending the life of the light source.

Only when the LED lamp has a good heat dissipation design can the product achieve stable luminous efficiency and quality, thereby reducing heat exhaustion and improving the life of the product and peripheral components. At present, due to current technology limitations, LEDs have low luminous efficiency, and most of the energy is converted into heat. Heat causes the temperature of the chip to rise, which causes LED light flux to drop, efficiency to deteriorate, accelerates chip aging and shortens its life span. The heat dissipation problem has become the bottleneck of high-power LED technology in lighting engineering applications. Referring to overclocking three technical improvements made in the research and development of LED radiator products this year, Du Jianjun said: "This year we have combined a variety of cooling technologies, the most important of which is the combination of heat pipe and CPU cooling technology. On the LED heatsink." The heat dissipation technology of high-power LED products is an industry problem. The heat dissipation directly affects the life of LED products. According to Du Jianjun, over-frequency three-product LED heat sinks are mainly used in low-power products. Die-cast profiles, in the high-power LED heat dissipation overclocking three put a considerable amount of energy, such as the application of air-cooled fins, heat pipes and other technologies on high-power LED products.