I. Overview
LED lighting is getting more and more sought after by the market. Now the city's Lighting Project has basically eliminated neon lights and used LED lights to make them. Among them, the application of the guardrail tube is particularly extensive. For example, the lighting of each overpass in Chengdu uses a large number of LED guardrail tubes, which not only decorate the city, but also illuminate the bridge body, making the entire overpass more magnificent and elegant. However, since the birth of the self-defense tube, there have been various quality problems. In addition to the low-cost bidding strategy of the government and other owners, the producer lacks a system on the basis of component selection and circuit design. The understanding does not solve the quality problem of the guardrail tube in theory and practice, and also lacks a strict supervision system for good construction and acceptance. The practitioners do not pay attention to development, and only low-price competition leads to the widespread quality of the barrier pipe in the market. Inferior, seriously ruined the reputation of the LED guardrail tube. At present, the vast majority of LED guardrail tube manufacturers in China have accumulated too little experience. The lack of investment in research and development is an important factor, and many of them are in the rough of home workshops. This article will introduce the reliability of the guardrail tube and our solutions to these problems from several aspects. I hope that some valuable reference and reference can be given to the barrier manufacturers, lighting engineering companies and owners, and the LED guardrails can be reversed. The bad impression of the tube reshapes its good real image.
Second, the use of guardrail tube
LED guardrail lights are widely used in overpasses, rivers, highways, gardens, building outlines, large advertising signs, pedestrian bridges, dance halls, bars, karaoke halls, etc., which are ideal for beautifying the urban environment. The length of the guardrail tube is generally determined according to the requirements of the user.
Third, the technical parameters of the guardrail tube
LED guardrail lights are available in monochrome, two-color, and colorful colors. They can be controlled by microcomputer or circuit to achieve various colorful changes such as gradation, jump, color flicker, random flicker, gradual alternation, running chase, and fixed color. The running parameters of each pattern can be independently configured, the automatic running mode can be edited, and the specified pattern can be selected. It can simultaneously control the lighting of dozens to thousands of LED guardrail tubes, automatically store setting parameters, and reload preset parameters. The number of LEDs in a general guardrail tube is: 96/108/144. At present, the shape is mainly D-shaped tube. Use voltage: DC 12V/24V/36V and AC 220V.
Fourth, the choice of guardrail tube components
1, light beads:
LED beads are definitely the most important device in the guardrail tube and are also of the highest value. LED beads must be selected from regular manufacturers. In our experience, chips with 12 micron or more are definitely better than 9 micron chips. This is mainly because the heat dissipation is better, and the light attenuation and reliability are much better, but the average user cannot detect it. . Chengdu Wenjian Electronics Co., Ltd. is engaged in the production of LED light bead. In addition to the chip, other auxiliary materials companies are also strictly selected, which can guarantee the quality of the produced bead, and the quality of the guardrail tube will be improved from the source.
2, power supply:
There are two ways to supply the guardrail tube: high voltage of 220V and low voltage of 48V or less. Direct 220V power supply is a dangerous and uneconomical way. The low quality method is to supply the voltage after the voltage is reduced by capacitors or resistors. 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. We have encountered multiple instances, LEDs are indeed power-saving but they are produced but consume a lot of power. For example, a bridge in Yibin, Sichuan requires more than 1,000 meters of guardrail pipes. Some people install electricity after low-cost supply. In less than half an hour, the power supply line of the whole city is almost collapsed. The power supply bureau is forced to power off the entire line. Our technical staff was invited to the site to help analyze the reasons. It was found that each guardrail tube used a 2.2μμ capacitor, and its power consumption exceeded 38 watts, and the power consumption of the previously reported LED was more than 7 watts. More times. The most terrible thing is: due to the sudden addition of a large number of capacitive loads on the line, the power supply line mismatch has formed a self-excited shock, but fortunately, the on-duty personnel can handle the accident or it may cause a big accident. Therefore, we strongly urge the power supply of the guardrail tube not to use the capacitor step-down method. So what is the best way? After our theoretical deduction and actual test, we believe that it is recommended to use DC power supply below 36V. The best choice for DC voltage is to use switching power supply. Considering the cost and line loss, the power supply can be segmented. Of course, it is also useful to convert the high voltage of AC 220V into a low voltage of AC 30V by means of a transformer. The efficiency of this method is lower. If the voltage is not applied, the light bead is easily damaged, and the resources are scarce. Non-ferrous metals are also becoming more and more expensive, not the direction of development.
3. Control method:
The guardrail tube is generally in the form of a solid light and a colorful light. Simple control methods for colorful changes are commonly used for CD4060 plus triode or CD4060 plus CD40174, and the frequency timing is 50Hz for the grid. We still recommend using a microcontroller program to be better, regardless of the grid. According to our production experience, the single-chip microcomputer plus 595 circuit uses the serial port form to minimize wiring, low cost, and flexible use. At present, our newly launched miniature guardrail tube power supply is not bad, and the cost, reliability, electromagnetic compatibility and other issues are solved well. Each guardrail tube can solve the power supply problem of the guardrail tube in the form of constant light. The 220V voltage is transmitted on the line, and the power supply is highly efficient.
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