Nowadays, the city's lighting project has basically eliminated the neon lights, and the LED guardrails and other lamps are used for the production. The application of the guardrail tubes is particularly extensive. However, since the birth of the guardrail tube, there have been various quality problems: due to the low-cost bidding strategy of the government and other owners, manufacturers are lacking in the design, construction and acceptance of the selection of lamps and components. Strict supervision has hindered the development of LED guardrail tubes. Manufacturers do not pay attention to development, and only low-cost competition will eventually lead to the general poor quality of the barriers in the market. At present, the vast majority of LED guardrail tube manufacturers in China have accumulated too little experience. They only saw that certain categories are profitable and havetily launched, but they have not invested in research and development, and they have long-term development plans. Many of them are shoddy in family workshops.
When you see the LED guardrail tube on the building, you will think of LED's long life, energy saving and high brightness. Although the LED light source has the above advantages, it can only be fully utilized if it is equipped with a suitable and efficient LED power supply, reasonable circuit design, perfect anti-static measures, and correct installation process.
The LED guardrail tube is composed of high-quality super bright LED light-emitting diodes, which are mainly used for urban landscape construction. It can be placed on the PCB board in a straight line in the order of red, green and blue. It is controlled by a dedicated driver chip to form endless colors and graphics. (as shown in the table)
Looking at the characteristics of LED guardrail tube from the production process
LED guardrail tube process has a "core"
The components of the LED guardrail tube include: engineering PC plastic cover, LED lamp bead, circuit board, components. "LED bead is definitely the most important device in the guardrail tube, and the chip inside is also the most valuable. LED bead must use the products of the regular big factory. In our experience, the heat dissipation of 12 microns or more is better, in the light The decline and reliability are much better, but the average user can't detect it," said Li Huaer chairman Guo Huaguo.
Generally, the number of LEDs in a guardrail tube is: 96/108/144. The outer cover is made of PC tube, and the inside is generally PCB circuit board + LED light source. The plugs on both sides are generally sealed with silica gel. Under normal circumstances, LED guardrail tube life can reach four or five years. A set of three lamp beads, a total of 36 sets of lamp beads in a 1 meter product.
At present, among China's 62 LED chip manufacturers, 29 of them account for 46%, 14 of which are foreign capital, 23%, and 19 of which are Sino-foreign joint ventures, accounting for 31%. A total of 34 foreign-funded and Sino-foreign joint ventures accounted for more than half of the total, reaching 54%. There are not many enterprises that are actually mass-produced in the 62 LED chip manufacturers, and the epitaxial wafers mainly rely on Taiwan, the United States and other regions to import, and LED chip production is also more concentrated in low-power chips. Domestically, Wuhan Diyuan, Guangzhou Jingke, Xi'an Huaxin Lihua and other manufacturers focusing on high-power chip production have emerged. However, from the current situation, high-power chips mainly rely on imports.
Cost perspective: The gap between the layers of the proposition is that the details are not long. "The price of an LED guardrail tube is between tens and 20 yuan. At first glance, the difference is not big, but we can't forget that the LED guardrail tube is the external wall decoration of a common building that is supported by the volume. To use a few kilometers of products, the decoration of a street is just over 10,000 meters," said Huang Yun, project manager of Greenman Optoelectronics. In this way, the addition, subtraction, multiplication and division, the meager profits will become a giant like a snowball.
The cost of LED guardrail tube mainly depends on four aspects: 1. Cover. PC board is generally used, and the quality of PC board is different (such as environmentally friendly materials, imported materials, etc.), and the price of superior and inferior materials will differ by 4 to 5 yuan. 2, the circuit board. Generally, single-panel, in addition to fiberboard, the "myopia" enterprise with no quality and only profit in the eyes will be made of cardboard. 3. Components and IC drivers. The difference between good and bad is 2 to 3 yuan. 4, lamp LED chip. Its core technology is in foreign countries. The market price of a group of high-power Cree chips is 5.6 yuan, and the average LED chip is 0.7? 0.8 yuan, a difference of nearly ten times. A qualified quality LED guardrail ex-factory price: external control: 50? 60 yuan; internal control: 30? 40 yuan; monochrome tube: about 25 yuan. The market price is naturally in the hands of engineering and design companies.
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Five "cans" in the production process of LED barrier pipes
1 Waterproof LED guardrail tube is generally sealed with hot melt adhesive or silicone at the interface of the cover. The internal LED and circuit board are exposed. Due to the large temperature difference between day and night, the end of the cover is different from the thermal expansion and contraction of the cover, resulting in hot melt adhesive. Or there is a gap in the silicone seal. After the rain, rainwater seeps into the interior, causing a short circuit and burning the LED. To solve this problem, it is necessary to fill the internal circuit and LED. It is simple to use a hot melt adhesive or a silicone seal, but the reliability is not as high as that required for outdoor applications.
2 UV-proof LED guardrail tube Because it requires mixing and rainproof, there will be a cover on the outside. The material selection of the cover is another means for reducing the cost of many non-standard companies. Products with good quality will use materials with increased UV resistance. Such as GE, Bayer and other materials, and the quality of the LED guardrail tube is a lot of materials mixed with nozzle material, can not talk about anti-UV, the sun is relatively large, less than a month, the cover becomes yellow , the light output is deteriorated, and the light transmittance is greatly reduced.
3 line loss non-ferrous metal price increase, the use of inferior materials and reduce the wire diameter is a cost-saving method for some manufacturers, generally good manufacturers will use more than 1mm wire inside, and the wire material is used in line with the national standard products. If the wire area is not enough or the material has too many impurities, the resistance value is large, and the front guardrail tube and the rear guardrail tube have a large voltage difference. In order for the rear LED to work normally, it is necessary to increase the input voltage. This invisibly increases power consumption, and much of the power is not used to drive the LEDs, but is wasted on the wires and constant current chips. Nowadays, the universal constant current chip has power consumption requirements, and the voltage and power consumption are large. If the power consumption is too large, the heat will not be discharged and the chip will be burned. This is why many LED guardrail tubes are much more damaged in front.
4 heat dissipation general LED guardrail tube cover and low seat are completely integrated, are plastic materials. When the LEDs are arranged very densely, after the heat balance is applied, the junction temperature of the LEDs is already high, which will cause the life of the LEDs to drastically decrease. The strong LED guardrail tube company will definitely have thermal designers. When designing the guardrail tube cover, it will idea to effectively transfer the heat of the LED and the heat of the constant current chip to the atmosphere. It is a good method to use aluminum on the base. In addition, the PCB should be placed as close as possible to the aluminum base.
There are two ways to supply power to the power supply guardrail: 220V high voltage and low voltage below 48V. Direct 220V power supply is a dangerous and uneconomical way. The low voltage method is to use a capacitor or resistor to reduce the voltage. This approach is first of all a big problem with security; secondly, it is too power-hungry and has great damage to the power grid. The power supply department is firmly opposed. Suddenly, a large number of capacitive loads are added to the line, causing the power supply line mismatch to form a self-excited shock, which may cause a big accident.
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