Along with the high-power LED lights to represent the range of outdoor LED applications more widely, the heat issue has become increasingly prominent. In some areas even become an obstacle to the development of the industry. Environmental Protection has a distinct advantage, especially in the lights, garden lights, pole, landscape and other high-power LED light source for lighting energy-saving effect is particularly evident. With China's rapid economic growth, increase energy efficiency lighting products under increasingly tight energy situation is very necessary, which is an important energy-saving LED street light applications.
Fast replacing traditional street lights in LED lights but also exposed some problems: poor heat dissipation caused by leakage and other phenomena abound. Directly affect the cooling capacity of the actual LED luminous efficiency and lifetime, so good thermal design is the focus must be considered. In fact, I feel the need to solve the heat problem of high-power LED outdoor lighting, cooling the material from the first start, the election of the material in order to better play the radiator function.
Outdoor lighting work environment is more complex, affected by temperature, UV light, humidity, wind, frost, snow, dust, chemical fumes and other natural conditions, so the heat sink material to have some characteristics: high temperature resistance, aging resistance, waterproof and so on. Outdoor high power LED lighting mainstream radiator copper or aluminum or other metal materials. The nature of the thermal conductivity of the metal is the best, especially comprehensive cost of copper, preferably aluminum. But considering the ductility of aluminum and processing performance better, we are using high-power aluminum radiator.
Weight outdoor high power LED street lighting, etc. mainly determined by the weight of the cooling device. As the power increases, the radiator size and weight also requires a corresponding increase in the chip and the bracket will be put forward higher requirements. Therefore, the weight reduction is particularly necessary. In addition to plastic, ceramic lamps can reduce weight, but other materials such as ceramics and ceramic plastic bag or in the interior lighting is mainly useful to. Since the ceramic itself is relatively brittle, machining performance is not high, so are generally used in less than 10W LED. Like LED lights, LED landscape lights and other outdoor lighting power rarely useful to existing technologies, processes are not supported by the use of high-power LED ceramic pieces. For a feature article in terms of heat, the thermal conductivity of a single talk is not enough. Especially for relatively high cooling requirements of high-power LED radiation and convection heat dissipation is critical.
Cooling is key, with the rapid development of LED technology, many products on the market increasingly becoming smaller, especially small high-power LED products. High-power LED lights, for example, the use of power per unit area increases, the heat generated also increases; To ensure reliable operation of the lamp can be instantly generated heat product in a timely manner to drain away, and prevent heat accumulation (LED junction temperature is generally 125 ℃) and affect the actual life of the product. By analyzing and comparing the performance of a variety of LED heat dissipating material distribution can be the key to solve the LED heat dissipation LED problem solving is not looking to see the high thermal conductivity of the material, but to change the LED heat dissipation structure or cooling mode. From the thermodynamic point of view, the way of heat transfer into radiation, convection, conduction, wherein the heat conduction fastest. Therefore, when thermal design power LED are generally refer to common IT mosaic heat pipe heat (thermal column) with an external heat sink combined with the manufacturers on the specific operation and in accordance with their grasp of technology development in various forms. The use of active cooling fan because of conditions, basically abandoned.
Product important, the overall level of service is more important. We now produce lamps have been sold not just only sold to customers radiator, but also meet the needs of customers, to provide the overall solution. Only the overall thermal solution can help customers save a lot of time and cost.
