Sunfree Lighting Limited is a high-tech manufacturer specialized in R&D and production of solar led street light

LED street light, high temperature of ideas and solutions

by:SUNFREE     2021-02-06
LED street light, high temperature will affect the service life of LED lamps and lanterns. Manufacturer of LED lights ED street lamp light is higher than high pressure sodium lamp many color, high pressure sodium lamp only around 23, color rendering index and the LED street light color rendering index above 75, think in terms of visual psychology, to achieve the same brightness, LED street light can, on average, more than 20% lower than the high-pressure sodium lamp. LED street lights maintenance costs low, compared with the traditional street light, LED street lights maintenance cost is extremely low, through the comparison, can recover all input costs less than 6 years. LED street light automatic control and energy saving device, can realize to meet the requirements of different times lighting cases, most likely to reduce the power, saves the electricity. Can realize the computer dimming, period and control, light control, temperature control, humanized functions such as automatic inspection. Think that the lower the temperature, the life of the light emitting diode and knot WenCheng inverse ratio. Balance the higher the temperature, the lower the service life. The radiator is to solve the problem of heat dissipation, as long as its temperature does not exceed its own can withstand the temperatures. The key is the temperature of the chip. In order to achieve the effect of rapid diffusion and dispersion, LED street lamps must be the heat generated by the rapid transfer to the radiator. Size and heat dissipation LED street lamp high temperature idea: street light, the relationship between the most direct way to improve power LED brightness is to increase the input power, in order to prevent the active layer, must increase the size of the p-n junction; The input power will inevitably increase the junction temperature, thereby reducing the quantum efficiency. Single tube power increase depends on the ability of heat from the p-n junction device, as well as in keeping the chip materials, structure, encapsulation technology, the current density on the chip and the equivalent heat dissipation. The use of LED street light heat sink is the most common way of heat, use of LED aluminum heat sink as part of the shell, in order to increase heat dissipation. Thermal conductive plastic shell. Using LED heat insulation plastic instead of aluminium alloy heat sink, can greatly increase the cooling capacity. Surface radiant heat treatment. Surface radiation and heat dissipation of the lamp shade. Simple method is applied radiation coating, it can be heat from the chimney surface radiation. Fluid dynamics using the shape of the lamp shell to produce air convection air, this is the lowest cost way to enhance the heat dissipation. The purpose of the lamp shell heat dissipation is to reduce the working temperature of the LED chip. Due to the expansion coefficient of the LED chip and the commonly used metal thermal conductivity and thermal expansion coefficient materials have very big difference, so the LED chip can not directly welding, to avoid high temperature and low temperature thermal stress damage the LED chip. The latest high thermal conductive ceramic material, the coefficient of thermal conductivity is close to aluminum, expansion system can be adjusted, and the LED chip synchronization. In this way, can be integrated thermal conduction and heat dissipation to reduce the heat conduction in the middle of the part. Fan and the lamp shell internal use long life high efficiency fan, enhance the cooling effect, low cost, good effect. Replace the fan is more trouble, however, is not suitable for outdoor use. This design is relatively rare in the liquid light bulbs. Vacuole packaging technology are used to transparent liquid with high thermal conductivity filler to the bulb of the lamp body. In addition to the reflection principle, this is the only use LED chip light-emitting surface to heat conduction and heat dissipation technology. Burner used in low power LED lights for household, the internal space of the lamp holder is often used to partially or completely placed fever drive circuit. This enables from a large lamp holder of the metal surface heat dissipation, such as nuts, because the lamp cap closely contact with base metal electrode and the power cord. Therefore, the part of the heat can come from. Using high thermal conductivity of ceramic thermal conductivity and thermal integration. LED street light heat six solutions: 1. Superconducting thermal performance: the micro groove group of compound phase change cooling technology has superconductive heat performance, the coefficient of thermal conductivity is 10000 times of aluminum substrate. The technology can timely to the LED chip cooling surface heat transfer to the infinite. Thermal conductivity is greater than 106 w/( m*℃) 。
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