LED as light source of street lamp,compared to traditional light source it has long life,good seismic performance, brightness adjustable,luminous flux losses small, light-emitting directional, environmental no harm and many other advantages. Currently in European and American countries have lots of alternative tradition street lamp such as high-pressure sodium lamp or metal halide lamp and so on, domestic a second cities have also large put into use.
LED street light is mainly used for outdoor environment, to withstand wind and rain for many years, the harsh environment of thunder and lightning, when the outside temperature can reach the maximum 50 ℃, while the lowest is also possible to reach -40 ℃. LED light source is a semiconductor light source, light-emittingproperties of its own to determine their failure rate is very low, theconnection part of the failure rate is quite low, so the LED drive power quality directly determines the lifetime of the street lamp, in thisLED to tell you about Lamp power selection to note some of the issues:
1. High-quality components
LED drive power is among the most central part of the LED street light industry. Currently,LED power supply production of domestic enterprises are too numerous to mention one by one,but due to technical strength, cost control and other reasons, and often have quality problems . but once installed street lights, maintenance is very difficult and requires a lot of manpower and resources, the major manufacturers on this street complain of unbearable.
The stand or fall of power quality, good design one of the elements,but power component is the premise of high reliability. Currently ,the key components in power are still some passive components and power components, such as capacitance and inductance, MOS etc, and these components of the best quality is still American, Japanese series products, the products made in China or Taiwan department in durability, anti-jamming, environmental fitness, quality and other aspects also have the difference. At present all LED street lamp power products of CLP huaxing all adopt America, Japan first-tier manufacturers' electronic components, good design can ensure that the power -40 ℃ to 60 ℃ temperature for a long time run normally, the current the actual failure rate in large quantities using finished products is less than a three million.
2. Price
At present, the LED street lamp power (SMPS) market competition is intense, although in this quality market-directed products market ,price is not the ultimate determinant on the factors, but in a good quality, more cost-effective can provide more profits and competitive advantage for the lights manufacturers. CLP huaxing in power supply industry for more than a decade of experience, and itself is international component agent ,and eliminating the agents profits and logistics costs. And at present many domestic power manufacturers buy components all through domestic components agents, buying cost is higher, although there are a few enterprises can strictly control the costs, but in comparison, LED street lamp power (SMPS) costs of CLP huaxing is still have big advantages.
3. Design margin
At present,the LED street lamps' application environment is very complex on domestic market,the main reason is the power supply voltage instability,electricity supply in the general case of the actual input voltage will always be a great deviation, and all kinds of waves and other unsafe factors moments affecting the normal operation of the power LED, which requires the design of power need a certain design margin. On the market at present the design margin of mainstream LED street lamp power (SMPS) in commonly around 40% headroom, CLP huaxing power design team launched the minimum 60% components design margin of LED power to ensure the demand for highly reliable of LED street lamp, and for key components surplus reserve is more fully. CLP huaxing R & D team manager said: on the design of LED street lamp power , we cost savings only in the link which has nothing to do with reliability , as long as involves reliability design we absolutely maintaining the principle of stability and high reliability, to ensure adequate design margin, the product can withstand 50,000 hours durability testing.
4. Lightning protection
Street lights installed in the outdoors, lightning is a very big threat. Lightning strikes are mainly direct lightning flash, conduction thunder, induction lightning and switching overvoltage four types ,the greatest impact on the power supply is induction lightning, it may produce up to 5000KV even higher voltage, with great destructive power. Aiming at these problems, CLP huaxing has taken the following measures with street lamp manufacturers to perfect product, make sure not to be struck by lightning. The first is the external lightning protection and internal lightning lights combine to set downlead and simple mechanical in the installation location for street lamp, these systems constitute external lightning protection system. The system can prevent fires and personal safety incidents caused by lightning. voltage protection and other ways to protect the street lamp. The system can prevent thunder and other forms of over-voltage invades equipment, thereby causing equipment destroyed, this is the external lightning protection system cannot guarantee. Between these two are mutually reinforcing and complementary. Internal lightning protection system in many devices such as shell, pass in and out on the cable, metal pipe area etc must be connected external lightning protection systems or set over-voltage protector, and equipotential connection. At present the CLP huaxing LED driver has passed 8000KV waves voltage test.
5. Energy-saving and high efficiency
As is known to all, LED street lamp project is the representative of the national energy saving project works. On the light-emitting components, LED itself feature has reached a very good energy-saving effect, but the power saving has been ignored by the major manufacturers. So energy saving power beyond doubt will be the most important components for street lamp power in the future. CLP huaxing since the start of 2006 has begun developing LED high reliability driver, now has launched more than ten series of almost a hundred of two level driver isolation high power LED street lamp power products, including 60 balance of products constant voltage source, constant current Product 40 balance. And can be customized according to customer needs. In order to reduce the cost pressure for street lamps producers. Recently the CLP huaxing technical research and development team after a long time technology research and testing, on the basis of two drives has formal launched the whole series single road, multi-channel (up to 20) output constant pressure, constant-current one-piece waterproof LED street lamp power modules isolate products, volume remains the same, and has realized volume production.
