How to prevent the hidden dangers of LED street lights in cold environments
With the rapid development of LED lighting technology, there is no shortage of LED street lights in road lighting in many cities in China. Especially after the luminous efficiency of high-power LED devices exceeds lm/W, LED street lamps have been generally recognized as the development trend of road lighting. Despite the rapid development of LED street lamp technology, most LED street lamp manufacturers ignore the special technical requirements in cold environments during product development. Many street lamp manufacturers believe that LED street lamps should be good for heat dissipation in cold areas. As everyone knows, LED street lights have stricter technical requirements in cold environments. If these technical requirements are not met, LED street lights are likely to have safety hazards in cold environments. So how should LED street lamp manufacturers prevent their safety hazards in cold environments?
1. Ensure that the minimum cross-sectional area of u200bu200bthe wire used on the LED lamp is larger than this .mm.
In a cold environment, the temperature is too low may cause the wire below this standard to crack, resulting in a short circuit, causing the wire to scorch and the insulation layer to burn out. Therefore, a wire larger than .mm must be used to avoid this safety hazard.
2. LED street lamps should be set with reasonable ultrasonic power, bonding pressure, bonding time and bonding temperature and other packaging process parameters according to the temperature change characteristics of LED lamps in a specific use environment.
Because the LED chip is packaged, it is a solid solid device, there is a mismatch in the expansion coefficient between the chip, silicone (or resin), metal bracket and lead, plus the thermal shock caused by the large temperature difference in cold areas The influence will increase the expansion and contraction of the silica gel during the temperature change, and the internal stress of the device will be too large, which will cause the increase of the displacement of the LED wire bonding point, and the premature fatigue and damage of the wire. At the same time, the solder joints with poor bonding state may be unsoldered, which may cause unsoldering of the solder balls and chip electrodes, and even cause the failure phenomenon of delamination and fall off of the LED chip.
There are hundreds of LED lamp beads used in an LED street lamp, usually in series-based hybrid configuration. If one LED lamp bead fails, it will cause multiple LED lamp beads to fail. Therefore, LED street lamps used in cold areas must first set reasonable ultrasonic power, bonding pressure, bonding time and bonding temperature and other packaging process parameters according to the temperature change characteristics of the lamp in a specific use environment to ensure that each LED device Reliability in low temperature operating environment.
3. Select LED lighting components with simple appearance structure, tight organization structure, surface waterproof, and excellent hydrophobic performance.
LED street lamps in cold areas are often overlooked by LED street lamp manufacturers is the accumulation of ice and snow on the surface of LED lamps. The ice formed after being melted by heat, once formed, it will cause a very big safety hazard to vehicles and pedestrians. Especially for LED street lamps, because the lamp housing is generally made of aluminum, the aluminum oxide on the surface is a hydrophilic material, which is more prone to ice condensation. To avoid this potential safety hazard, you must use LED lighting components that are simple in appearance, tightly organized, waterproof on the surface, and excellent in hydrophobic properties.
When street lamp manufacturers use the above three measures to produce LED street lights, they can effectively prevent potential safety hazards in cold environments. Although the overall price of LED street lights will increase using these methods, consumers will Will also be willing to pay.
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