As a light source of street lamps, LED has many advantages such as long life, good seismic performance, adjustable brightness, small loss of luminous flux, directionality of light, and no harm to the environment. At present, traditional street lamps such as high-pressure sodium lamps or metal halide lamps have been replaced in Europe and the United States, and domestic first- and second-tier cities have also been put into use.
LED street lamps are mainly used in outdoor environments. They have to withstand harsh environments such as wind, rain, and thunder and lightning. The outside temperature can reach 50 °C at the highest temperature, and it can reach -40 °C at the lowest. The LED light source belongs to the semiconductor light source. Its own light-emitting characteristics determine its failure rate is quite low, and the failure rate of the connected part is also quite low. Therefore, the quality of the LED driving power supply directly determines the life of the entire street lamp. Here, we will introduce the LED. Some questions to be aware of when choosing a street light source:
First, high quality components
LED drive power is the core part of the LED street light industry. The current domestic production of LED power supply is too numerous, but due to technical strength, cost control and other reasons, quality often problems, and once the street lamp is installed, maintenance is very difficult, requires a lot of manpower and material resources, the major street lamps manufacturers Called hard.
The quality of the power supply is good, and good design is one of the elements. The power supply component is the prerequisite for high reliability. At present, the key components of the power supply are still some passive components and power components, such as capacitors, inductors, MOS, etc., and the best quality of these components is still the products of American and Japanese manufacturers, and the Taiwanese and domestic products are durable. There are still gaps in terms of sex, anti-interference, environmental adaptability and quality. At present, all LED streetlight power products of CLP Huaxing adopt electronic components from the first-tier manufacturers of the United States and Japan. The good design ensures that the power supply can operate normally at a temperature of -40 ° C to 60 ° C for a long time. The failure rate is less than three ten thousandths.
Second, the price
At present, the LED street lamp power supply market is highly competitive. Although the price is not the final determinant in this quality-first product market, the higher cost performance under the good quality can provide more profit margins and competitive advantages for street lamp manufacturers. . CLP Huaxing has more than 10 years of experience in the power industry, and it is an international component agent, eliminating 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 high. Although a few enterprises can strictly control the cost, in comparison, the cost of LED streetlight power supply of CLP Huaxing is still relatively high. There are great advantages.
Third, the design margin
At present, the application environment of LED street lamps sold in the domestic market is very complicated. The main reason is that the power supply voltage is unstable. In the case of ordinary mains power supply, the actual input voltage tends to have a large deviation, and various surges. Unsafe factors such as wave impact affect the normal operation of the LED power supply at all times, and the power supply needs to have a certain design margin. At present, the design margin of mainstream LED street lamp power supply on the market is generally around 40%. The CLP Huaxing power supply design team has introduced a minimum of 60% component design LED power supply to ensure high reliability requirements for LED street lamps, while for key components. The amount reservation is more sufficient. The person in charge of the R&D team of CLP Huaxing Technology said: “In the design of LED street lamp power supply, we only save costs in the aspects that are not related to reliability. As long as the reliability design is involved, we absolutely adhere to the principle of stability and high reliability to ensure sufficient With a design margin, the product can withstand 50,000 hours of durability testing."
Fourth, lightning protection
Street lights are installed outdoors, and lightning strikes are a very big threat. There are four types of lightning strikes: direct lightning, conductive lightning, inductive lightning and switching overvoltage. The most influential power supply equipment is induction lightning, which may generate voltages of up to 5000KV or higher, which has great destructive power. In response to these problems, CLP Huaxing has taken the following measures to cooperate with street lamp manufacturers to improve their products and ensure that they are not struck by lightning. The first is the external lightning protection of the street lamp combined with the internal lightning protection. The lower lead wire and the simple ground net are installed at the street lamp installation position. These systems constitute an external lightning protection system. The system can avoid fire and personal safety accidents caused by lightning strikes on street lamps. The internal lightning protection system means that the street lamp is protected by grounding and voltage protection inside the power supply. The system prevents lightning and other forms of overvoltage from intruding into the equipment, causing damage to the equipment, which is not guaranteed by external lightning protection systems. The two are complementary and complement each other. The internal lightning protection system is connected to an external lightning protection system or an overvoltage protector and equipotential bonding on many devices such as the outer casing, cables entering and leaving the protection zone, and metal pipes. At present, CLP Huaxing LED street lamp power supply has passed the 8000KV surge voltage test.
Five, energy saving, high efficiency
As we all know, the LED street light project is the representative project of the current national energy conservation and emission reduction project. On the illuminating components, the characteristics of the LED itself have achieved very good energy-saving effects, but the power supply has been ignored by major manufacturers. Therefore, the energy-saving power supply will undoubtedly be the most important part of the street lamp power supply in the future.
Since 2006, CLP Huaxing has been developing LED high-reliability power supply. Now it has launched more than ten series of nearly one hundred two-stage driven high-power LED street light power products, among which more than 60 constant voltage source products, constant current More than 40 products. And can be customized according to customer needs. In order to reduce the cost pressure of street lamp manufacturers. Recently, after a long period of technical research and testing, CLP Huaxing Technology R&D team officially launched a single-channel, multi-channel (up to 20 channels) output constant voltage and constant current integrated isolation waterproof LED street light power supply based on the two-stage drive solution. The module product, the volume remains unchanged, and mass production has been achieved.
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