Analysis of The Factors Affecting The Temperature of LED Street Lights Manufacturers from xiuxiu's blog


After the LED street light is turned on for a long time, the temperature inside the LED light will gradually rise. If the heat generated cannot be dissipated in time, it will have a great impact on the service life of the street light. Will cause led street light fixtures and street light heads damaged. The following is an analysis of the factors affecting the temperature of Led street lights Manufacturers(CLASSICLEDLIGHT).

LEDs also generate heat during operation, depending on the overall luminous efficiency. Under the action of external electric energy, the radiation of electrons and holes recombines to produce electroluminescence, and the light radiated near the PN junction needs to pass through the semiconductor medium of the chip itself and the encapsulating medium to reach the outside (air). Comprehensive current injection efficiency, radiation luminescence quantum efficiency, the external light extraction efficiency of the chip, etc., finally only 30-40% of the input electrical energy is converted into light energy, and the remaining 60-70% of the energy is mainly caused by non-radiative recombination lattice vibration. Formal conversion of heat.

Whether the LED light works stably, the quality is good or bad, and the heat dissipation of the light body itself is very important. The heat dissipation of the high-brightness LED light on the market often uses a natural blade heat sink to dissipate heat, and the effect is not ideal.

The main structure of LED lights using LED light source is composed of: LED, heat dissipation structure, driver, lens and other parts. Therefore, heat dissipation is also an important part. If the LED does not dissipate heat well, its life will be affected. Thermal management is a major issue in high brightness LED applications. Since the p-type doping of the group III nitride is limited by the solubility of the Mg acceptor and the higher starting energy of the hole, heat is particularly easily generated in the p-type region, and this heat must be dissipated through the entire structure on the heat sink; The heat dissipation path of the LED device is mainly heat conduction and heat convection; the extremely low thermal conductivity of the substrate material leads to an increase in the thermal resistance of the device, which causes a serious self-heating effect and has a devastating effect on the performance and reliability of the device. The effect of heat on high-brightness LEDs. The heat is concentrated in the chip with small size, the temperature of the chip rises, causing the non-uniform distribution of thermal stress, the luminous efficiency of the chip and the lasing efficiency of the fluorescent powder to decrease; when the temperature exceeds a certain value, the device failure rate increases exponentially.

According to research data, the reliability drops by 10% for every 2 °C rise in component temperature. In the LED lighting system composed of multiple LED strings and parallel arrangement, the problem of heat elimination is a problem that has always been concerned in the industry. Addressing thermal management issues has become a primary factor in high-brightness LED applications.

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