Selection factors of LED street light power supply

Publisher:MeshulunLatest update time:2012-11-13 Source: 维库电子Keywords:LED Reading articles on mobile phones Scan QR code
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1. High-quality components

LED street lights are mainly used in outdoor environments and have to withstand harsh environments such as wind, rain, thunder and lightning for many years. The outside temperature can reach 50℃ at the highest and -40℃ at the lowest. LED light sources are semiconductor light sources. Their own luminous characteristics determine that their failure rate is quite low, and the failure rate of the connection part is also quite low. Therefore, the quality of LED driver power directly determines the life of the entire street light, which is also the core part of the LED street light industry. There are countless companies producing LED power supplies in China, but due to technical strength, cost control and other reasons, quality problems often occur. Once the street lights are installed, maintenance is very difficult and requires a lot of manpower and material resources. Major street light manufacturers complain about this.

Good design is one of the factors for the quality of power supply, and power supply components are the premise of high reliability. At present, the key components of power supply are still some passive components and power elements, such as capacitors, inductors, MOS, etc., and the best quality of these components are still products of American and Japanese manufacturers. There is still a gap between Taiwanese and domestic products in terms of durability, anti-interference, environmental adaptability, quality, etc. At present, all LED street light power supply products of China Huaxing use electronic components from first-tier American and Japanese manufacturers. Good design ensures that the power supply can operate normally for a long time at a temperature of -40℃ to 60℃. The actual failure rate of finished products currently used in large quantities is less than 0.03%, which is at the leading level in the industry.

2. Price

At present, the LED street lamp power supply market is highly competitive. Although price is not the final determining factor in this quality-first product market, higher cost performance with good quality can provide street lamp manufacturers with more profit margins and competitive advantages. China Electronics Huaxing relies on more than ten years of industry experience in the power supply industry, and it is an international component agent, which saves the agent's profit and logistics costs. At present, many domestic power supply manufacturers purchase components through domestic component agents, and the purchase cost is relatively high. Although a few companies can strictly control costs, in comparison, China Electronics Huaxing's LED street lamp power supply cost still has great advantages. For specific plans and prices, please contact China Electronics Huaxing's marketing department.

3. Design margin

At present, the application environment of LED street lamps sold in the domestic market is very complex. The main reason is that the power supply voltage is unstable. Under the condition of ordinary mains power supply, the actual input voltage often has a large deviation, and various unsafe factors such as surge impact always affect the normal operation of LED power supply, which requires the power supply to have a certain design margin. At present, the design margin of mainstream LED street lamp power supplies on the market is generally around 40%. The power supply design team of China Electronics Huaxing is the first in the industry to launch LED power supplies with a minimum design margin of 60% of components to ensure the high reliability requirements of LED street lamps, and the margin for key components is more sufficient. As the person in charge of the technical research and development team of China Electronics Huaxing said: "In the design of LED street lamp power supplies, we only save costs in links that are not related to reliability. As long as it involves reliability design, we absolutely adhere to the principles of stability and high reliability to ensure sufficient design margin. This is also the reason why our products can withstand 50,000 hours of durability testing."

4. Lightning protection

Street lamps are installed outdoors, and lightning strikes are a very big threat. After years of research, the China Electric Huaxing Technology R&D Laboratory concluded that there are four main types of lightning strikes: direct lightning, conducted lightning, inductive lightning, and switch overvoltage. The most influential to power supply equipment is inductive lightning, which may generate voltages up to 5000KV or even higher, which is extremely destructive. In response to these problems, we have taken the following measures to cooperate with street lamp manufacturers to improve products and ensure that they are not struck by lightning. First, the external lightning protection of street lamps is combined with internal lightning protection. Down leads and simple grounding grids are set at the installation location of street lamps. These systems constitute an external lightning protection system. This system can prevent street lamps from causing fires and personal safety accidents caused by lightning strikes. The internal lightning protection system refers to the protection of street lamps by grounding and setting voltage protection inside the power supply. This system can prevent lightning and other forms of overvoltage from invading the equipment, causing equipment damage, which is something that the external lightning protection system cannot guarantee. The two complement each other. Internal lightning protection systems have many components such as housings, cables entering and exiting protected areas, and metal pipes that need to be connected to external lightning protection systems or overvoltage protectors, and equipotential connections. At present, China Huaxing LED street light power supply has passed the 8000KV surge voltage test, and no failures caused by lightning accidents have occurred in actual use. This is closely related to the technical research and development team's focus on design, scientific research, and customer-oriented concepts.

5. Energy saving and high efficiency

As we all know, the LED street lamp project is a representative project of the current national energy conservation and emission reduction project. In terms of light-emitting components, the characteristics of LED itself have achieved very good energy-saving effects, but power supply energy saving has been ignored by major manufacturers. Therefore, energy-saving power supplies will undoubtedly be the most important components of street lamp power supplies in the future. With years of focus on power supplies, China Huaxing has made great efforts to improve the quality and efficiency of power supplies. The current conversion efficiency of LED power supply products is as high as 90%, and some products are even as high as 95%, meeting the requirements of high efficiency in all applications.

Keywords:LED Reference address:Selection factors of LED street light power supply

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