The man who has the channel can control the market of LED lighting

Recently, the Chinese buy led high bay lamps industry channels Summit by the State Lighting R & D and industrial alliances with large lighting all media jointly organized successfully concluded in Beijing . Through this meeting, the merchants for the ” channel construction ” and ” must channel the world ” have a more profound understanding , let us together to share their harvest.
The channels Summit , I learned a lot . Let me speak many guests of the industry also has a new view. The arrival of the era of LED lighting industry has undergone tremendous changes, changing the lighting for each person .
In my opinion, changes in development of the industry is mainly reflected in three aspects: First, from the changes in the consumer market , the project market demand and market demand, household consumption explosive growth period has ended, the industry into “intensive ” era, the era of profiteering come to an end ; secondly , household consumer brand awareness is on the rise , do not pay attention to brand building, the development of enterprises rely on plagiarism will eventually perish , either stores or product manufacturers ; third , e-commerce is becoming a new channel model, most of the 80 , 90, after household consumers keen. As a business , we should always pay attention to these changes in the industry, according to actual situation , to adjust their pace and strategy to make the transition at the critical moment the best choice .
Times are changing , industry change. As Beijing is currently the largest professional lighting market , Shili Lighting City also followed the pace of change to make timely adjustments. Are out of the area of ​​specialization Square Shili home lighting Lighting City of Light MALL boutique shop, work lights and other buildings , this adjustment is in respect of the market , customer needs . Promotion from the current point of view, the product mix has improved steadily growing tendency to form clusters , lighting the city with a total generation of factory outlets based. Shili lighting the city ‘s focal point is the introduction of the future more and more competitive advantage of products and brands. Overall, Shili lighting the city ‘s management can be divided into category management and meticulous management , professional operation and systematic dissemination of promotion, integration of resources and strengths to build the core competitiveness , these three strategies in the era of LED lighting will Shili lighting the city to bring more opportunities.
In addition , in order to meet customer needs , Shili Lighting City Lights building in Block B of the negative layer opening stage lighting, sound , exhibition lighting , LED screens , LED luminous characters operating area , an area of ​​nearly 3,000 square meters, is currently the largest in Beijing the stage lighting exhibition base. Meanwhile, it is relying on a strong Shili Lighting City brand, integrated on the first floor , second floor , third floor of the commercial lighting , outdoor lighting , LED Corner and other categories of operations in Beijing formed a unique stage lighting exhibition base.
Manufacturers to build mutual trust and benefit channels
Beijing Yu Pan Pearl Trading Company general manager Zhang Xuechuan
At present , the construction enterprises in the LED channels complete with a “focus on the job + meeting ” model , on the surface , is indeed produced some results , but this is only the initial problem to solve a small part of the provincial agency customers gathered , does not solve the core problem in circulation terminal. From the perspective of long-term development perspective, companies should fill the full content can fundamentally solve the problem of the circulation of the terminal.
Manufacturer’s responsibility is to ensure the stability of product quality , reasonable product price and market policies , but also to establish a sound and complete service system, and businesses to develop and maintain distribution channels. The responsibility of business is to prepare a reasonable and effective inventory , provide a complete and establish a sound service system , and actively guide the distribution of the enhanced distribution sales skills and expertise. Establish channels of both sides must be the result of close cooperation , the two sides should cooperate with each other in the channel construction, and walk away .
This meeting , I learned a lot of things, I deeply understand the project and channel complementary relationship. LED is still a long way ahead , we have to learn a lot of things , I hope to be able to take part in such a meeting.
Uniform standards and promote the healthy development of the industry
Beijing general manager Liu Lei fun in lighting appliances
To participate in the Summit channels , so I was most impressed by a point is: the current channel compared to a car driver , sharp eyes but also to take into account the distance in front . Only obtained on the basis of survival , have the energy in the current chaos to focus on the future development of the situation , seize opportunities. The face of change and development of the industry , whether it is the traditional channels of ” veteran ” or LED era derived ” recruits ” to solve the problem of existence before us is the most important .
Currently , there are the biggest problem the industry is the industry standard is not uniform , the production company for their own business , there is no viable product specifications and quality requirements of the standard , companies blindly reduce production costs and low sales , leading to market disorder , resulting in consumption those fears. I hope that the relevant state departments , industry associations and enterprises have a certain social responsibility to promote the introduction of industry standards as soon as possible , so as to promote the sound development of the industry.
LED lighting industry to bring the biggest change is that manufacturers resources become very rich emerging market wide range of products . In addition , LED product life cycle is very fast, leading to a short life cycle inventory LED is very difficult for businesses, it is a headache.
In the Beijing market , some businesses do plenty of inventory , but sales may not be good . This year, we come into contact with many manufacturers , many manufacturers do not prepare a lot of inventory , and most of the manufacturers of the product planning is not very clear, have expressed the need for a trial period . As a result, the industry on a ” cold upstream and downstream hot ” phenomenon.
Stage , LED lighting channel network very confusing for the business, the focus blurred. In selecting the brand agency , business indecisive, leading to chaotic channel construction . Overall, the channel has yet Which LED companies doing very well, every business in the effort to want more than to seize some market share.
I attended the Chinese LED lighting channels Summit biggest gain understanding of the industry with the light heavyweights Liu Big Brother , his experience and perspective so I learned a lot ; Second Harvest is my prospects for LED lighting have a relatively clear understanding of Forum brought together many industry heavyweights other characters , and their views , ideas very clear, views on industry analysis of channel development is in place ; third, I no longer like before, always staring at the town ‘s goods, now broadens horizons , a deeper , more long-term thinking , you can make better choices .
I believe that e-commerce is developing very rapidly. Now most consumers buy lights will go online inquiry, before buying or lantern to Shili Bandung , which are not spent , and on home shopping networks , including engineering products , are now going online inquiry. E-commerce upward momentum very quickly , people’s consumption habits are changing, should change our thinking .
Traditional lamps and LED lamps coexist , many traditional manufacturers are restructuring. But this process there have been many problems, I think the manufacturers and distributors should solve the problems in the transition process together .
The entire LED industry ,  buy led high bay lamps companies stand ahead of the industry . The dealer is to maintain sales by individual contacts. Industry is very confusing, LED lighting before the new standards come out , depending on which brand , manufacturers, distributors hold enough endurance to the end, it is the winner.
At present time the industry in turmoil , provincial agencies such as the problem of how we exist ? Currently , our inventory can not digest, for two reasons : First, factory sales of traditional products provide a substantial inventory of no help ; Second, the new LED products come as a dealer we must keep up the pace , and actively promote and sales. In fact , in the terminal market dealers and industry conditions in the factory to get the latest information and other aspects are somewhat missing . In the new era of LED lighting , whether manufacturers or merchants , industry should strive to eliminate information asymmetry , so that the healthy , healthy development.

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The feeling of LED lighting driver features and future development

Keynesian famous ” crisis of underconsumption theory” contributed greatly to the economic development on a global scale , but also resulted in exponential growth in the consumption of resources , sustainable development gradually unsustainable , green concept is catching on . LED solid-state lighting sources , such as solar power technology and industrial development of countries competing to become the ” beach-goers .” In 1962, the United States successfully developed in a joint laboratory GE, Monsanto, IBM , marking the birth of the red led high bay fixture compound semiconductor devices . From small emitters start , LED lighting after six years of development , gradually evolved into going to dominate the ” light” areas of the world “hegemony “, however, ” sunny ” LED lighting in the world there are still ” a ” little clouds LED driver .
To understand LED driver , the first to look at the composition of LED lights , LED spotlights from the typical LED light, aluminum plate , LED drivers / power supplies, lenses , radiator / heat sink , lamp , etc., shown in Figure 1 [ 1 ] . LED light source is of course the center of the lamp , but the LED driver also plays no small role. If the LED lights seen as the body , the driver can be compared to its “heart” , to provide the necessary “blood” and “nutrition .”
First. Past articles DC Switching Power Supply Classification
LED or LED driver power supply itself is an application type switching power supply , switching power supply LED driver can be called “past .” Switching power supply is generally defined as : the use of modern power electronics, control switch turn-on and turn-off time ratio , maintaining a stable output voltage , switching power supply generally consists of a pulse width modulation (PWM) control IC and MOSFET composition. Compared with another type switching power supply linear power , with a small , light-weight and high efficiency. Modern switching power supply has two: one is DC switching power supply ; another AC switching power supply. DC switching power supply to the power supply of poor quality of the original ecology (coarse electricity ) , such as mains or battery power is converted into high quality equipment to meet the requirements of the DC voltage ( Varitronix ) . Core DC switching power supply is DC / DC converters.
Switching power supply is a major event in the invention of the industrial sector, gave birth to the individual PC directly into millions of households . About Apple’s ” Joe closer ” and ” Steve Jobs Biography” in vivid , wrote: “Jobs consulting company dedicated to the Atari Alcorn his former boss , see if there is any way to make a computer without using a fan circumstances under supply. Alcorn Steve Jobs introduced to Rod Holt , a smart guy . Holt designed the Apple II ‘s power section , he did not use the traditional linear power , but to create an instrument such as an oscilloscope use of the switching power supply. such frequency power can pass off increased from 60 to thousands of times , thereby reducing the amount of heat supply Apple II Jobs believes that Rhodes should be a place in history , this power supply design is revolutionary invention . ” [ 3 ] switching power supply appears not only greatly reduces the size of the individual PC , but also to thousands of electronic products have become very” mini ” , led to the personal consumer electronics major development, we have today convenient life. Switching power supply products have been “expansion” is a huge family , ” their children ” widespread “service” in the industrial automation and control , military equipment , LED lighting , communications equipment , electrical equipment, medical equipment, LCD monitors , LED lighting, communications equipment , computer chassis , digital products and other fields.
Second, LED driver features and future direction
As a switching power supply LED driver family members , according to its load characteristics and application scenarios , with distinctive characteristics. I will sum up their demands for ” eight sophomore low .”
1 small ( low ): LED lamp to accommodate the installation space of the traditional lamp , LED driver is usually installed in the lamp inside , so the volume is smaller ;
2 High reliability : The driver is the source of living water LED lights , high reliability requirements is for certain ;
3 low cost: a major obstacle to the popularity of LED lighting is the cost of the LED chip costs have not dropped in front of people ‘s psychological expectations , LED drivers are subjected to layers of cost conscious and ” exploitation ” ;
4 High efficiency: high-efficiency LED lights how they have to find a ” perfect match” drive ;
5 good waterproof ( H): outdoor LED lighting applications such as street lights to withstand the test of rain and snow ;
6 vibration characteristics of a good ( high ) : outdoor LED lighting applications such as street lights to withstand the test of inclement weather windy ;
7 long-life ( H): claims life of 100,000 hours of LED lamp life can not have a short board ;
8 temperature characteristics ( high ) : the impact of high power density, and summer and winter ambient temperatures can not let the driver is not working ;
9 humidity characteristics of a good ( high ) : To withstand humid weather such as sauna day test ;
10 Immunity good ( high ) : lightning , overvoltage, overcurrent and other power fluctuations can damage the drive nothing.
Seen in this light , high-quality LED driver with high demands , but in the cost of the design cycle , intense competition and other pressures , many LED driver “fallen “, and simply replaces the standard capacitor step-down switching power supply appears in the crowded market of various LED . Is considered to be an important cause of  led high bay fixture life can not achieve the expected . In fact, the “eight sophomore low ” requirements facing the LED driver can work together to resolve by way of technology and the environment, development to electrolytic capacitors, digital surveillance technology can improve the driver ‘s native life ; improve power quality , people -driven costs gradually changing the composition of the environmental tolerance can greatly improve the LED driver fate. But more important is the view of the driving concept.
In fact , LED light source and LED driver who has been closely bound together with all sorts of potential , LED light source is not just the lighting , the decision is not just a power LED driver . Say “LED high-tech ,” high-tech reflected in where? Only a light effect you ? Insufficiency yes. Reflected in the high-tech research and development, production, technology and other aspects . There it is the biggest difference with the traditional lighting sources , and that is its origin is actually a semiconductor chip , which determines the LED light source can be like other semiconductor chips , such as CPU, GPU, FPGA, ARM , etc. , like , a ” Pandora Magic box ” magic , with” mustard can be satisfied Sumeru ” magic , magic , and magic is inseparable from the driver ‘s help ( of course, with the semiconductor intelligent control chip driver ) , which is the source of intelligent lighting (smart lighting) concept lies. With smart lighting , we can monitor real-time energy consumption of lighting , lighting of the state , more prominent energy concept. Not only that , the lighting can be adjusted automatically according to the ambient light intensity and scenes. Imagine a quiet night , street lights are automatically adjusted to the low power output , cars and people appear to increase the output power , and then transferred back to the original state when you leave ; during the summer , the house is automatically adjusted to the cool colors …… family of intelligent lighting an application scenario shown in Figure 3 [ 4 ] , through smart phones, we can control the brightness of the living room, bedroom , study, LED lighting, space , color temperature , distribution, monitoring power consumption state lighting with a customized user free function.
All these are not fantasy. LED Driver LED lights at the same time as the “heart” of the courage to take again the “brains” of responsibility for various lighting gives fantastic features , the future , in the intelligent LED driver assistance , LED lamps can achieve the function of the human dream , become “Experience China” things important part.

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Investigating two factors influencing urban led lighting design

Today, the rapid development of urbanization and promote the city ‘s ever-changing lighting facilities continue to follow up . As a city illuminated by a generalized public travel and to meet the transport needs , gradually rising to how to reflect the cultural characteristics of the city, from the gradual development to meet the functional lighting led high bay lighting wholesale . As a city lighting designers, whether it is the overall planning and design of urban lighting , lighting or regional planning , or the design of a Street, Lane must first consider the natural environment, cultural characteristics, the level of overall planning and economic development of the city and other factors , the only way to meet both functional lighting of the city, but also fully embodies the character of urban lighting , urban lighting to avoid the phenomenon of thousands of city side , to achieve the desired effect of urban lighting . Therefore, factors affecting urban lighting design is the construction of urban lighting around the past and must face the problem. In this paper, the impact of urban lighting design of several factors that made ​​one o’clock discussed.
First, the natural environmental factors
The natural environment is an extremely complex and rich natural complex, there are many areas have not yet been recognized or understanding was not enough deep, are yet to be people to discover, to explore . In the natural environment of this discussion , focusing on the biosphere is directly related to the natural environment and landscape lighting is directly related to the natural environment. According to the nature of the environment and human factors and ways to adapt to the natural environment can be divided into the physical environment , chemical environment , biological and social environment and so on.
1.A physical environment
Component factors of the physical environment , including temperature , air flow , pressure, sound, light, radiation , etc. When these factors in a natural state , to give people a direct stimulus, people will get a corresponding feeling and make behavior reflects . In these factors , the contact directly with landscape lighting design is ” light .” Light is a language that can express the lighting designer’s design philosophy and artistic pursuit ; just a hidden software that controls the functions of the operation and interpretation of the image and colors cities and buildings ; light is ” building the fourth -dimensional space . ” Therefore during the lighting design landscape lighting designer , should take the initiative to understand light , to observe the light , the use of light , light environment actively involved in the design of the light into their planning and creativity among the increasing “light” for the city and buildings Tim “color .”
2, the chemical environment
Constituting the chemical environment factors , and various gases including air , water, dust, chemical substances. Air oxidation of lamps , luminaires affect water corrosion , dust barriers to light and so will the final result of landscape design . So when choosing landscape lighting designer lamps , require its waterproof, dust level reaches a certain standard , commonly referred to IP protection.
3, the biological environment
Biological environment is an animal , plant, microorganism constituted as natural human organism are also included . For when a building needs to be landscape lighting design , taking into account the local flora and fauna species , growing conditions and distribution of variation present and future development . The lighting design of the building itself , while also on the surrounding flowers , trees , rest facilities aided design , landscape lighting to form a finished whole .
4 , the social environment
Social environment refers to the relationships as the center of the human environment , it covers a wide range of content , some degree of impact on the landscape lighting design.
Second, the human environment factors
Human environment is unique to human society is a very very comprehensive integrated environment, including politics, culture, art, science , religion , aesthetics , and so on . Perfect human environment must be in line with nature, is to protect and improve the natural environment . Environment is a reflection of cultural heritage , as well as culture also slowly affect the environment. For a city, a fixed environment should include roads, buildings , parks, lighting , lawn and so on. But when people into one scene when people booming , there is liquidity. Exchange of people and the environment , cultural environment can be taken away , while the concept of the environment on human will have an impact . This is the action we often mentioned in a static, static in action , movement Aioi relationship.
Human environment is one of the factors leading lighting design . Design lighting designers have done , in fact, is to create an atmosphere that one kind of ready to come out of the culture that is an objective reality, maybe you invisible, but you can feel from the middle , and also deduce your feelings affect your mood . Modern cities are too many roads, buildings and landscape lighting , as a whole always feel a little stiff , in fact, because too much emphasis on technical lighting , ignoring the cultural state , people feel is passively accept things. The focus should be natural lighting and harmony , so the designer during the design , it should be taken into account to roads, buildings and landscape layout , line, color , proportion, scale , texture , light, rhythm and rhyme , so that viewers initiative to find, mining, experience , wondering where taste. Designer’s role is to create a comfortable environment, lighting and atmosphere , to guide the people to a better side, so that people take the initiative to pursue the good , to give people a comfortable and relaxed mood .
Adverse aspects of the human environment light pollution, visual pollution , color contamination , psychological pollution. From the perspective of the light of existing lighting settings , primarily in the following four areas:
( 1 ) of the illuminated areas and objects used in light color, surface illumination illuminated areas and objects and functions , uncoordinated nature and the environment , to make people feel uncomfortable ;
( 2 ) the use of the way , regardless of where a large area lighting fixtures cast light settings , resulting in no hierarchy and illuminated three-dimensional object , also causing light pollution, seriously disturbed the normal life of the people ;
( 3 ) use a lot of tall buildings of high-power flood light , due to the impact of the projected direction of the projection angle and other factors, about one-third to one-half of the light toward the sky, forming a light beam, so over the city by light pollution , seriously affecting the astronomical observations and aircraft landing ;
( 4 ) Set in gardens , green spaces , roads, sculptures and some of the surrounding landscape led high bay lighting wholesale pedestrians, vehicles, and in the rest of the region ‘s tourist and entertainment glare interfere with the line of sight , not only destroyed the rest of the environment and endanger traffic safety.
With the progress of society , the management of standardization, I believe they will be cured , and we have a responsibility to promote the social , environmental condition, protect the environment, to protect themselves.


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CE/ROSH/FCC approved LED Recessed Down Light

LED down light made in China

Investigating the factors influencing urban led lighting design

  In the field of urban lighting , diversification of investors to make lighting designers will be faced with numerous owners , namely the market economy determines the unit owners must proceed from their own economic interests, lighting design project implementation to take a different approach : a profit- lighting owners , because the implementation of the lighting can bring opportunities to improve economic efficiency , so the enthusiasm is high, but there is another than the brightness , to battle the phenomenon of blind increase lighting. This will not only increased investment , but led street lights price also undermine the overall artistic effect in the region . Owners of non-commercial lighting , illuminated only by the implementation of economic investment and no benefit in return , so the enthusiasm is not high or minimize investment , also affected the overall effect of the region. Meanwhile, the various owners of the illumination light to understand the depth and personal thinking , consciousness , love , differences in aesthetic point of view , forming a colorful lighting effects , such as governmental office actually using green lighting, people feel eerie , rather than government buildings serious, solemn. In fact, for different lighting objects should choose a different color of light . Closely related to people's emotions and colors , such as blue makes people feel calm and satisfied, gives a brilliant yellow and excitement , eager to win the red people , rejuvenated , red and green intertwined feel strong, reliable, perseverance, a touch of blue can cause a sense of security and self-esteem , red, orange , yellow and other warm colors make people excited, warm atmosphere , etc. ; under normal circumstances should be used with caution lighting green, blue , purple and so cool , it is easy to adopt inappropriate people feel gloomy cold.
  Since the reform and opening up, China 's lighting technology from the light source , lighting to lighting design , great changes have taken place . Than a single incandescent light source and straight tube fluorescent lamps, tungsten halogen development , fluorescent high pressure mercury lamp, high pressure sodium , metal halide lamps , compact fluorescent lamps , lamp , LED lights.
Lighting equipment , lighting development is relatively slow in a long time , the important role of lighting is often overlooked. The past 20 years , with the rapid development of new sources , the new lamps are also emerging , these new lamps have the following common features :
( 1 ) With the need for new light sources , developed a matching lamps, such as high pressure sodium lamps, metal halide lamp fixtures .
( 2 ) manufacturing light material and processing a qualitative leap. Highly reflective surfaces such as the use of high- purity aluminum lamp surface coating made ​​of advanced processing technology , surface reflectivity up to 88-92% ; lamp diffuser using a prism lens -shaped plastic plate , white anti-static materials such as acrylic resin plate , transmission ratio, good dustproof and anti-aging properties.
( 3 ) reasonable lighting design and advanced design tools , the use of premises for the state space , environmental conditions and requirements, determine the type of lamp light , the use of computer-aided design to determine the shape of the reflecting surface , reaching a high luminaire efficiency .
( 4 ) After the authority of Quality Supervision and Testing Center lamps , lighting the lamps meet the performance standards drawn a realistic lighting calculation parameters, including light distribution curve , utilization factor tables, etc. , for the use of lighting design .
New light appeared since the 1950s , most of the use of magnetic ballasts . Inductive ballast stable, good quality , low price , the more popular . But there are also many drawbacks itself :
( 1 ) their large power loss ;
( 2 ) prone to noise ;
( 3 ) a serious detrimental effect stroboscopic vision ;
( 4 ) copper and silicon steel material loss, big weight ;
( 5 ) long-term use , it is possible due to the temperature rise too high and cause a fire ;
In advanced countries to promote the development of high-frequency electronic ballasts , after 10 years of efforts , China's electronic ballast to reach the international advanced level. It has many advantages over magnetic ballasts :
( 1 ) energy-saving effect, under the same circumstances flux output , can save 20-25% ;
( 2 ) tubes at 20 to 50kHz frequency operation , eliminating the stroboscopic effect , light stability, protect eyesight, reduce visual fatigue beneficial ;
( 3 ) eliminating the noise ;
( 4 ) reduce the impact of fluctuations in the power supply voltage offset and flux ;
( 5 ) can be achieved dimming fluorescent lamps.
With the development of urban lighting , high-tech and high-tech lighting equipment began to promote the use of lighting in the city , such as laser lighting, computer searchlight , aerial ball lights , fiber optic lighting system, LED light band , Promise fluorescent lamps , lighting in the city engineering has been applied , not only received a general illumination method is difficult to achieve lighting effects , but also the level of urban lighting technology has improved significantly.
In summary , with the city lighting technology continues to improve , room lighting design lighting designers in the choice of greatly increased, together with emerging high-tech , urban lighting design will play a finishing touch effect.
  The design of each project has its certain regularity , contrary to the law of development of things that will take many detours or reach more satisfactory results . For lighting lighting design is also true that it is the combination of light and art , is cleverly arranged lighting and landscape elements of the original structure , including the rational and emotional point of view . The main elements of the program include the feasibility of investors, the lighting designer ideas and intentions and on-site environmental dimensions .
Lighting design lighting design in a way different from the other , greatly affected the investment to meet the functional requirements is essential. How to meet the functional requirements under the premise of landscape lighting at night is more beautiful , the scale of investment would be affected , but in recent years, with the continuous development of high-tech investment in the light of the practical application of the lighting is even more important.
Lighting designer lighting should fully understand the properties of an object , function, environmental viewpoint , shape features , style, and , in particular, to understand the lighting designer's creativity, design intent , to show the contents of the lighting design related drawings. For objects with different attributes , lighting designers how light , lights , colors , what purpose , what effect the performance , the difference is enormous. Positioning lighting lighting environment , ie spatial relationships in determining the brightness standards must be coordinated with the environment , to light just right , not the more light the better , to overcome the psychological mutual competition , avoiding only emphasized the lighting objects , without regard to the surrounding light environment.
Positioning point of view , it is possible to watch the lighting in the analysis of a number of viewpoints lights ( far and near , high, low , around the four directions ) , based on the setting of the main viewpoints and best view , and thus starting the overall idea of ​​lighting effects and lighting specific programs . Many cities have their own unique lighting shape and become the city's landmark buildings , they are a strong recognition of the deep to stay in people's memories . As a lighting designer , in the shape of its light, no matter what the lighting method adopted must respect and in accordance with its unique shape, not only with light language expression of its existence, but also in the hearts of the people setting up the next night it enjoys in the daytime the iconic status : If improper lighting , led street lights price distort the natural form, will be evaluated as " a big mistake ."
Meanwhile, the lighting landscape lighting to reflect the style of no style would be no personality , not to mention taste. Some lighting has a strong national style , while others are very modern , and some showed a modern style , and some very local characteristics , and these styles tend to be fully reflected in the shape and appearance of lighting design through a variety of techniques out ; lighting objects of different styles , methods and techniques adopted lighting are not the same .
Site environment including brightness lighting objects background of local landscape lighting , local people 's favorite color or preferences and customs and power supply and so on.
Of course , factors urban lighting design , there are many , such as the level of economic development , cultural ideas , etc., as long as the lighting design in the city as the various factors to consider before a comprehensive, will give the development of urban lighting design solutions provide true and reliable basis , and ultimately achieve the desired effect of urban lighting .

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led high bay lighting fixtures

Something about the measurement way of LED brightness

As with traditional light source, led street lights wholesale source, optical unit of measure is unified.In order to make readers to understand and easy to use, the following will briefly introduce the relevant knowledge:A flux,Light flux is refers to the amount of light emitted at a light source in a unit time, the radiation power by the human eye can feel that part of the radiation energy.It is a band of radiation energy per unit time and the product of the relative rate of visibility of the band.Due to the human eye to different wavelengths of light relative rate of view is different, so different wavelength of light radiation power is equal, the luminous flux is not equal.The symbol for Φ of luminous flux, unit for lumens (Lm).According to the spectral radiant flux Φ (lambda), thus can get flux formula:GV Φ = Km s Φ (lambda) (lambda) d lambdaFormulas of V (lambda) - relative spectral luminous efficiency;Km - radiation spectral luminous efficiency of the maximum value, the unit for Lm/W.In 1977 by the international metrology committee to determine the Km value is 683 lm/W (lambda m = 555 nm).Second, the light intensityLight intensity refers to the unit time per unit area by light energy, and energy is proportional to the frequency, is the sum of their intensity (integral), can also be understood as the luminous intensity of light source in a given direction I was the solid Angle of the light source in the direction of the luminous flux transfer within d Φ divided by the quotient of the solid Angle yuan d ΩThe unit of luminous intensity is candela (CD), 1 CD = 1 lm/sr.The space of all directions of light intensity is the sum of luminous flux.Third, brightnessWe've been testing the brightness of the led street lights wholesale and LED optical radiation safety in the process of evaluation, commonly used imaging method, tests on the chip microscopic imaging may be used for measurement.Brightness is the brightness of the light source on the face of a certain place, L is the binning dS luminous intensity in a given direction is divided by the area element in the plane perpendicular to a given direction orthogonal projection area of the businessBrightness of the unit is the candela per square meter (CD/m2).When light emitting surface and measuring direction is vertical, cosine theta = 1.Four, lightLight intensity of illumination is refers to the object, illuminated with acceptable flux per unit area.Light and lighting source, be according to the surface and the position of the light source in the space, size and the intensity of light source and light is directly proportional to the Angle of incidence of yu xuan, and with the light source to be as is inversely proportional to the square of the distance of the object surface.Point on the surface of illuminance E is incident luminous flux on contains bin point d Φ divided by the quotient of the bin area of dS.Unit for lux (LX), 1 LX = 1 lm/m2.

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The luminescence theory of LED light

Light-emitting diodes , commonly called LED. Light-emitting diodes is just a tiny light bulb. But unlike common incandescent bulbs, light-emitting diode has no filament , and also not particularly hot , it just is a semiconductor material in which electrons move it to light. Because there is no filament light-emitting diodes will burn , so life will be longer. And light-emitting diodes little plastic bulb makes light-emitting diodes is more durable, plus the led street lights price  can more easily fit now electronic circuits. Traditional incandescent light-emitting process contains a lot of heat , which is totally a waste of energy . Heat emitted light emitting diode is very small , relatively speaking , the more energy is to reduce the need for direct light emission energy larger extent .


Light is a form of energy , an atom can be released . There is a lot of energy and momentum but did not like the quality of the tiny particles composed of small bundles . These particles are called photons, is the basic unit of light. Photon is because electrons move was released. In the atom , the electrons in the atoms move around in four tracks form . Orbital of the electron with a different type of energy. Generally speaking, in order to have a greater energy electrons move away from the nuclear track . When electrons from a lower to a higher orbital track jump , the higher energy levels , in turn , when falling from a higher to a lower orbital electron in orbital energy is released . Energy is released in the form of photons . Higher energy declined to release higher -energy photons , which is characterized by its high frequency.
Free electrons from the P -type layer is formed by the body into an empty diode electron holes . This includes from the conduction band to a lower rail drop function , the electronic energy is released in the form of photons . This can happen at any diodes inside , when the diode is composed of a substance , you just can see the photons. In standard silicon diodes atoms , for example , when the electron falls to a relatively short distance atoms are arranged in such a manner . As a result, the frequency is so low because the electronic case servant 's eyes are not visible .
Visible LED, such as using the digital clock display type , the size of the gap determines the frequency of the photon , in other words, determines the color of light. When all diodes emit light are led street lights price  , most are not very effective. In ordinary diode , the semiconductor material itself attracts a lot of energy and an end. Light-emitting diodes covered by a plastic bulb lighting concentrated in a particular direction .
Price semiconductor components have been drastically reduced over the past 10 years, I believe the future of light-emitting diodes in a wider range of applications and is a more cost-effective lighting options .

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high bay led light fixtures

LED lighting products will blur the line between led light source and led lamps

For the future development trend of LED lighting light source substitute products gradually to the development of lamps and lanterns, and the lines will blur due to the led street light Manufacturer used for lighting.LED lighting products in 2012 sales of about 42 billion yuan, accounting for 10% of the lighting products sales, with exports of $3.5 billion.Exports the most power of the United States, accounting for 15.29% of total exports, followed by Japan, 10.44% of the total exports.Encapsulation LED the global market for $13.7 billion, 23% of which is used for lighting, 22% for TV/monitor backlit, 19% for mobile devices.Since this year, the domestic market presented a a small LED lighting.Chen Yansheng said that this change is mainly manifested in three aspects, the first is due to the price rise, consumers gradually known and accepted for LED lighting products, followed by the lighting products dealers actively promote LED lighting products, finally is power to the LED lighting enterprise channel shop goods.LED lighting products, the current market demand is more light source alternatives, such as the ball bubble, MR16, PAR lamp, lamp, etc.For the future development trend will gradually to the development of lamps and lanterns, such as office with flat light, with absorb dome light and versatile dome light, etc."The boundary due to the LED light source and lamps and lanterns used for lighting and blurred, European and Japanese society also change accordingly. Such as JELMA and JLA has merged in March this year."led street light Manufacturer is the future development direction of lighting industry, for quite a long time, the traditional lighting products especially effective will coexist with the LED lighting products, but the LED share will be increased year by year.

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Several factors which restrict the development of the LED lighting

As now use led street light fixture family more and more, but the development of the industry has not got great progress, the first led mesh analysis is mainly has the following several aspects.One is making the lamp lack some hard Numbers.Manufacturer of the lamp is now very much, resulting in the differences in the parameters of the production and quality.Because now the energy-saving lamps have no fixed standard, making it impossible to verify the relevant data for the energy-saving lamps, to give the poor quality of some unscrupulous businessmen manufacturing energy-saving lamps.The second is energy-saving lamps is slightly higher in price.LED energy-saving lamps, the market demand is very strong, whether domestic or industrial or lighting, its development is very broad.But because the price of energy-saving lamp is generally a little high, so some places and family in order to be able to save money don't buy energy-saving lamps, more expensive than ordinary light bulbs on dozens of times, so as to curb the development of the industry.Three is the production of energy-saving lamp technology didn't get the innovation.Now we are still belongs to the use of energy-saving led street light fixture more bad of the lamps and lanterns, some technology in some foreign, due to the electricity price is quite high, if use normal bulb requires a lot of electricity, so foreign basically is to use energy-saving lamps.And techniques of energy-saving lamps in China is single, technology development, also contain the development of the industry.

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Where are the real needs of the middle reaches package to the LED lighting chip?

Upstream LED chips as the source , the entire led street lights wholesale industry chain is the most voice link. Insiders believe that , " the development of upstream power enterprises to grow , allowing the LED industry ' bets are alive ', and even change the pattern of China 's LED industry fundamentally ."Therefore, how to meet the midstream upstream chip packaging product development direction , LED product systems to meet quality requirements and cost targets ? Become a challenge for the entire industry chain and address key structural overcapacity . In this regard, the new century LED Network reporter interviewed industry representative 30 LED packaging companies senior technical staff , from their perspective to explore the LED chip packaging company for the real needs of the situation .Quality and stability is the primary considerationIn the actual use of the stability and consistency is an important indicator of the level of LED technology , the manufacturing process due to interference from a variety of different batches can easily cause inconsistent product quality , while the LED chips inconsistencies will undoubtedly affect the yield and stability of the packaging of the product.In the interview, every one , without exception, said packaging companies , purchasing chips primary consideration is the consistency of product quality and stability.Country star power Foshan Co., Ltd. Dr. Li Cheng , deputy general manager , said select chip performance is certainly a major consideration , including the main optical parameters and reliability, while focusing on the optical parameters of light efficiency , wavelength and brightness of the concentration profiles and so on. Fierce price war and then must maintain good quality, otherwise the company's products would not live long.Guangzhou Hongli Opto-electronic Co., Ltd. engineers sand Lei pointed out that the chip is one of the most important factors affecting the LED stability , quality stability of the middle reaches of the chip package and even downstream applications is essential.In addition, the voltage sub-file will affect LED wide and narrow spectral relatively narrow voltage sub-file is more conducive LED off when the spectral concentration Bin , improve yield.Lunda Electronics Corp. Taiwan side said that the current development of the chip, the application still faces major backlight , so the packages , the chip provides few options , coping with different power packages must choose a different chip, general , the main factors determine the chip market is competitive and cost-effective quality stability both in the same light efficiency . Broadly speaking , the quality of stability is more important than price .Executive Vice President Yi Mei -Light ( Beijing ) Technology Co., Ltd. , Chief Scientist Dr. Liu Guoxu LED to the New Century Network reporter On the Road , in the procurement of LED chips , in order to quality for the first element of stability , the stability of the primary confirmation chip technology and reliability.Cost is still the goal of all manufacturers wrestlingWith LED civilian market gradually opened , all the manufacturers are trying to industrial upgrading between "quantity and quality" look for breaking the road. How to improve performance, reduce costs, has become almost the entire LED industry chain wrestling common goal .Wuhu Rui Rio , general manager of led street lights wholesale to New Century Network reporter mentioned , the key points to consider are cost-effective, such as when the customer reaches the whole lamp 100lm / W, we will think about what kind solutions to our customers the most appropriate , and then on-demand solutions choice has the advantage of chips to the current chip market, high light efficiency, relatively high on the high brightness chip prices, packaging cost, is definitely a pressure to provide appropriate and available brightness to meet customer demand package is our concern.Dr. Ma Wenbo president four Chuanbo lion comes Optoelectronic Technology Co., Industrial Research Institute , currently pay more attention to the first price , due to the cost of the chip in the LED industry chain accounts for a relatively large proportion of the decline in chip prices , can to a large extent reduce the price of LED products . In addition , the current LED market competition, cost-competitive products will be more competitive.Guangzhou Hongli Opto-electronic Co., Ltd. engineers sand Lei also said that light efficiency and price is the primary consideration, the current market trend is to fight lm / yuan , the same price you can buy a higher lumens will be more favored by customers . Select chips will compare existing chips , the same price , choose high lumen ; same lumens , choose low- priced chips , we hope that based on the original , light efficiency and price competitive products .

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Domestic LED street lighting packaging industry development situation in 2013

As the semiconductor lighting industry chain midstream sectors , the package features that provide adequate protection chip , chip and failure to prevent exposure or mechanical damage in the air long-term , in order to improve the stability of the chip ; For led street lights price  package , you also need a good light extraction efficiency and good heat resistance, good packaging can make LED luminous efficiency and have better thermal environment , and thus enhance the life of the LED .
First, an overview of the development of LED packaging industry
LED device packaging plays a connecting role in the development of semiconductor lighting industry in China and also has one of the industrial sectors of scale and cost advantages in the global semiconductor lighting industrial chain division of labor . These national policy guidance in the environment , coupled with the continuous development of technological innovation, the entire domestic LED industry has a high degree of growth in the economy , LED packaging industry is also accompanied by simultaneous growth of the LED industry .
LED packaging industry on the pattern of global perspective , China's packaging industry is already the world's most concentrated area , is the world 's major LED package to undertake industrial transfer , Taiwan, China and the United States , Korea, Europe , Japan and other major enterprises LED packaging capacity is a large part in the country to achieve . According to Chinese LED Industry Research Center data show that in 2009 summarized the global LED packaging companies total revenue of $ 8.1 billion , an increase of 5.02% compared to 2008 . 2012 Geographically , the Japanese corporate income still ranked first , accounting for 33 % of the world , but the share declined year by year, Taiwan ranked second , accounting for 17 % of the world , while South Korean companies income increased from 9% in 2008 to 15% in 2009 , the agency is expected to have 2013 LED packaging market value of $ 13 billion , is expected in 2014 will reach 13.39 billion U.S. dollars , the annual growth rate of 7 %.
Second, the domestic LED output and production development
In recent years , China's LED packaging capacity increased rapidly, species than the whole package , relative to the epitaxy and chip industry , China 's LED packaging industry 's most competitive , the largest, skill levels are closest to the international advanced level. Domestic LED packaging industry has matured , LED packaging industry is expanding. LED packaging companies active over will be listed in the capital market and the downstream application industries growing demand for power , the accelerated expansion of enterprise scale , productivity growth, China, in 2009 , the domestic LED packaging production value reached 20.4 billion yuan , compared with 2008 's 18.5 billion yuan increase of 10.3% ; production from 2008 's 94 billion to 105.6 billion , growth of 12% , including high brightness LED output value reached 18.6 billion yuan , accounting for 91% LED package of GDP. From both the domestic product and corporate structure, has greatly improved , SMDLED and high-power LED package devices is growing rapidly. With the current strength of the LED market , LED packaging market will subsequently enter the high-growth phase.
With the continued strong market of LED , LED packaging market also will enter the high growth phase. China LED Industry Research Center aggregated data show that in 2010 , China's LED packaging production value reached 25 billion yuan , an increase of 23 % compared to 2009 's 20.4 billion yuan ; production from 1,056 in 2009 to 133.5 billion one hundred million , of which highlight LED output value reached 23 billion yuan , accounting for over 90% LED 's total sales. 2012 due to the lighting and backlighting also stimulating production dramatically increased , reaching 242.8 billion . Domestic LED packaging industry output growth is mainly because most of the international LED packaging manufacturers in China because of promising applications market , have set up production bases in China , has achieved mass production , is becoming important in the world of low-end LED packaging base. Increase domestic industrial sales efforts , as well as domestic companies to expand production capacity , investment in energy production due to be released .
Domestic packaging companies in the regional distribution presents a complete industrial chain concentrated advantages, formed a complete industrial chain of LED package . Dependent on Chinese economic layout features, Chinese LED enterprises are mainly concentrated in the Pearl River Delta, Yangtze River Delta, Fujian and Jiangxi regions, and the Bohai Economic Rim , gathering lines into four regions . Pearl River Delta region in mainland China LED packaging companies most concentrated , the largest regional packaging industry , the number of firms over the country's 2 / 3 , accounting for 68 % of total business , in addition to the upstream LED epitaxial chips a little lacking , but brought together packaging materials and packaging of many equipment manufacturers and dealers , supporting the most perfect. Followed by the Yangtze River Delta region , the number of enterprises accounted for about 17 % of the country 's other regions accounted for 15% of the ratio.
Domestic LED packaging market characteristics
Speed ​​capacity expansion to enhance utilization. This year the situation is excellent LED package , the majority of its production capacity in an emergency . Ruifeng power , BDO Runda, Xindeco other listed companies have announced the expansion of production capacity of LED devices . It is understood , not just listed companies , unlisted companies this year also launched an expansion wave . A non-listed company said their package booked through the end of production can not keep up . The expansion of the product is mainly white SMD package devices , production capacity increased by more than 30 percent over last year . Experts said that last year the LED package of serious excess capacity , capacity utilization rate is only 5-6 percent in the first half of this year the power LED capacity utilization reached 80% or more. Many packages listed companies have expansion plans : Honglitronic the first half of this year has added a 100KK production capacity in the second half may increase 200KK. Jufei costing $ 100 million expansion project of LED lighting devices on September 30 this year for completion . Investment in production equipment Ruifeng power to raise investment in the first half of this year , " LED lighting products transformation projects " have been fully completed , the annual production capacity of 1,350 KK, LED lighting products annual capacity of 2,470 KK. Meanwhile, Ruifeng power SMDLED expansion project will start construction period of 2013 -2014 7, 1, 2009 June 30 , the expansion project is finished, LED lighting products company with annual production capacity 8388KK.
Increasing output without increasing business , white device plunges quickly. 2012 domestic LED packaging industry since basically a continuation of the second half of 2010 prices, the decline in gross margin trend, white lighting led street lights price  fell more than 10 percent per quarter . Packaging companies are the most beneficial business in 2013 , because this year in addition to the LED lighting market launch , the entire light chain transferred from Korea and Taiwan enterprises. This year's LED packaging companies undergone significant change, especially packaging companies listed reflects the common characteristics : a steady increase in overall performance , but the strength of the main business and the actual profitability is not ideal , falling profits . Domestic LED prices will continue to follow the price of the device downward trend , but the large-size backlight and lighting products to enhance the penetration of the product price decline will be narrowed, the gross profit margin gradually stabilized . It is worth mentioning that this year's white LED devices, due to the pull of home lighting and commercial lighting , white SMD devices this year, especially the rapid growth in the first half , led to the rapid development of the packaging industry , a number of packaging manufacturers appear full state , is also because of this reason, the white device into the whirlpool of a price war with the price increase has led many manufacturers do not increase . From each package listed companies to publish reports of the first half of 2013 , the gross profit margin of each company 's white devices have a downward trend. Hongli Opto-electronic white white device main business revenue growth of 20.34% , but the decline in gross profit LampLED 9.35%, SMDLED gross margin fell 9.84 percent ; Ruifeng power LED lighting device operating income increased 49.23% , gross profit decreased by 4.89% over last year ; Jufei optoelectronic devices operating income growth of LED lighting by 42% compared to last year , gross profit was 20.16% , but profits fell 5.59 percent .
Midstream package to accelerate the restructuring and integration . Intense competition and the huge market potential makes the most of the lighting industry downstream enterprises to enter midstream downstream applications , according to statistics more than 90 % of the packaging companies have entered the field of downstream applications , and the proportion is rising value of the application ; portion of LED packaging companies have chosen joint cooperation way into the LED downstream , providing downstream to the sea for its products. LED lighting applications built downstream channels , LED lighting applications market share cake . This market trend is particularly prominent in this year's performance , the following table is representative of this enterprise integration behavior.

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Two LED lighting separation methods and its application based on the chip and encapsulation

Early on, the LED street lighting is mainly used as an indication or display lamps , and generally appear to single devices , so for the wavelength of sorting and brightness control requirements are not high . But with the efficiency and brightness of the LED continuously improve its increasingly wide range of applications . When the LED display and the display device as an array , because the human eye for color and brightness wavelength sensitivity , with no sorting through the LED turns will produce uneven phenomenon , thereby affecting people's visual effects. Wavelength and brightness unevenness will give an uncomfortable feeling. This is the LED display manufacturers are not willing to see, is that people can not accept.
LED generally in accordance with the dominant wavelength, luminous intensity , luminous flux , color temperature , voltage, reverse breakdown voltage , and several other key parameters for testing and sorting . LED testing and sorting LED production process is a necessary step . Currently, it is the number of LED chips and packaging manufacturers capacity bottlenecks , but also the LED chip manufacturing and packaging costs an important part .
Method of selection of LED
LED sorting of two ways: First, the chip -based test separator , the second is for testing packaged LED sorting .
( 1 ) test of the chip sorting
LED chip sorting is very difficult, mainly due to the LED chip size is generally very small, from 9mil to 14mil (0.22-0.35nm). Such small microprobe chip needs to be able to complete the test , the process of sorting machines and require precise image recognition system , which makes the cost of the device becomes high , and the test speed is limited . Now the LED chip testing sorter price of about one million yuan \ Taiwan , and its test speed of about 10,000 per hour . If the calculation of the monthly 25 days , each sorter 's monthly capacity 5KK.
At present , the test chip sorting in two ways:
One way is to test the sorting completed by the same machine , it has the advantage to be reliable , but the speed is very slow, low productivity ;
Another method is to test and sorting done by the two machines , testing equipment, record the location and parameters of each chip , and then pass the data to the sorting device, for quick sorting, so the advantage is fast, but the drawback is relatively low reliability , error-prone , because in testing and sorting usually has between two steps separating the substrate and chip thinning process , and in this process , the wafer may be broken , local incomplete or partially incomplete fragmentation , making the actual distribution and stored in the chip sorting machine where the data does not match , resulting in separation difficult.
From the fundamental solution to the bottleneck problem of sorting chip testing is the key to improving wafer uniformity. If a wafer within 2nm wavelength distribution in brightness changes within +15 % , it can be all the chips on this film into one file (Bin), as long as the failure to pass the test chip removal can will greatly increase the capacity and reduce the chip cost of the chip . Uniformity is not very good in the case can also be used to test and put " more substandard products ," the chip area coated inkjet manner disposed of, to quickly get the desired "qualified" chip , but doing so the cost is too high , other rooms will meet the requirements of many chips as substandard waste disposal permit , the final accounting of the cost of the chip market may be an unacceptable level .
(2) LED sorting tests
The LED can be packaged according to wavelength , light intensity , light angle and the operating voltage testing sorting . As a result, the LED into many files (Bin) and categories , and then test the sorting opportunities automatically according to the setting of the LED test standards in different Bin packing box. As people increasingly high demand for the LED , the early sorter is 32Bin, later increased 64Bin, now has 72Bin commercial sorter . Even so, the sub- Bin LED technology indicators are still unable to meet production and market demand.
LED test separator working in a specific TPC flow ( eg 20mA), the LED test , the general will do a reverse voltage value of the test . Now LED test sorter price of about 40 to 500,000 yuan / Taiwan, its test speed of about 18,000 per hour . If you follow a monthly 25 days , 20 hours per day working time calculation , each sorter 's monthly capacity 9KK.
Large display applications , or other high-end customers, high quality requirements of the LED . Especially in the wavelength and brightness consistency requirements are very strict . If the LED packaging factory in chip purchases not made strict requirements , these packaging factory in a large number of packages will be found , packaged LED , only a small number of products to meet a customer's requirements , most of the rest will become into the warehouse inventory. This situation forces the LED packaging plant in the LED chip purchases made ​​strict requirements , in particular the wavelength , brightness, and the voltage indicator table ; for example , a wavelength of the last requirement is +2 nm, and now requires the +1 nm, and even in some these applications have been proposed +0.5 nm requirements. For chip factory to produce such enormous pressure , before selling the chip must be strict separation .
From the above the LED chips on the LED of the selected points can be seen , more economical approach is to test the  LED street lighting sorting . However, a wide range of the LED , different forms , but now the shape of different sizes , different light angles, different customer requirements, different application requirements, which have completely the right to use the LED products selected for the test of the sub- select become difficult to operate. And the current LED applications are mainly distributed in several wavelengths, and brightness range segment , a packaging factory is difficult to prepare all the customer needs in various forms and types of the LED. So the key issue back MOCVD epitaxial process , how to grow a desired wavelength and brightness of the LED epitaxial wafers is to reduce the cost of key points , this problem is not resolved , LED production capacity and costs will not be fully resolved. But the uniformity of the epitaxial film is controlled ago, relatively effective method is to solve the fast low-cost chip sorting problem .
Sorting equipment
Currently, LED chip testing sorting equipment mainly by the United States and Japan, vendors , and LED test sorting equipment mostly by Taiwan, Hong Kong manufacturers in mainland China is not able to provide similar equipment manufacturers. LED chip sorter includes two hardware components ( robot , micro- probe and optical tester ) and a set of system software, which is three parts by different manufacturers to provide further integrate ; while the LED test points selected machine includes LED mechanical transmission , storage and optical testing in two parts.
LED technology trends of selected
( 1 ) the uniformity of the epitaxial film be controlled before the rapid development of low-cost chip sorting processes and equipment.
( 2 ) With the class W power LED technology, the traditional parameters of LED product testing standards and testing methods can not meet the lighting needs of the application , shall develop new test standards and methods , contains more optical and lighting related content.
( 3 ) in the LED system life testing, research and development of LED systems rapid determination of long-term performance and lifetime assessment techniques .
( 4 ) LED lighting is in working under high current drive , which raised its higher reliability requirements. Filter by inappropriate traditional LED lighting with high-power LED. Must develop new screening test approach , excluding early failures goods, to ensure product reliability.

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A long life LED drive circuit design

This paper mainly due to the presence of existing LED street light drive circuit electrolytic capacitors and shorten its life shortcomings , we propose a non-electrolytic capacitor LED driver circuit design. The program to extend the life of the circuit as the theme to switching power supply combined with a linear basis , exceed the full use of their respective advantages, because the switching power supply with high efficiency of energy conversion characteristics of the linear power supply has no output ripple characteristics, the designs take advantage of their respective strengths to replace electrolytic capacitor filter , effective solution to the existing LED drive circuit of short service life . The LED driver circuit without a large -capacity electrolytic capacitor , a small capacitor can be used for film capacitors, long-life capacitive elements , it has a long life , high efficiency, small ripple current characteristics, and has high safety and stability .


LED (light emitting diode ) is a new generation of green lighting , energy saving, environmental protection, high brightness, long life and other advantages . Not only is it the new darling of lighting , but also with much related to people's lives . Therefore , the development of long-life drive power, build high- efficiency, low cost , high power factor and is the LED light quality and overall performance is the key , but also the needs of the development of LED lighting technology . According to incomplete statistics, the existing incandescent bulb life LED lights less than about 40 times . Because not only the light emitting diode direct current driven device , but also media converter, a photoelectric conversion function. Its main function is the current flowing through the electrical energy into light energy , so its advantage is energy-saving light source than the general efficiency and working life to be higher . However, the LED drive power rectifier and filter circuit generally requires the use of large-capacity electrolytic capacitor. Electrolytic capacitor life is generally l05 ℃ / 2000h, that is when the capacitor rises to 105 ℃ ambient temperature when its life is only 84 days , even when operating at a temperature of 85 ℃ environment, the service life of only 332 days , so the electrolytic LED driver circuit capacitor life is impeding the main reason . In order to improve drive power of life , it is necessary to remove the electrolytic capacitor , as this paper , we propose a non-electrolytic capacitors , high-brightness LED driver power supply.

Circuit topology using flyback topology circuit , a PWM switching frequency is controlled so that the output constant current and voltage drive LED street light. Including: former level protection circuit , EMI filter circuit , the rectifier circuit , RCD clamp circuit , synchronous rectification circuit, a power conversion circuit , the output filter circuit, the feedback circuit, control circuit.
To make the circuit less subject to electromagnetic interference , EMI filter circuit is connected to the first level protection circuit, the circuit through which the higher harmonic filter and the circuit of the surge .
Part of the input rectifier , respectively, by the bridge rectifier circuit and the π -type filter circuit , because the diode with a single conduction characteristics , so the bridge rectifier circuit converts AC power to DC unidirectional , and then in the π -type filter circuit under the effect of stable output DC voltage.
Then by the control circuit adjusts and controls the output reaches the design value , and finally through the output filter circuit reduces the output ripple current into direct current , and finally use the DC output to the LED .

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ledhighbaylight: How to survive in an increasingly competitive LED ...

ledhighbaylight: How to survive in an increasingly competitive LED ...: In 2013,  the LED street lights market competition becomes more intense, A lot of small factory because labor costs rise, products unit p...

How to survive in an increasingly competitive LED street lighting market

In 2013,  the LED street lights market competition becomes more intense, A lot of small factory because labor costs rise, products unit price to drop, operating costs continue to increase increasingly seem to be unsustainable, under the condition of the factory in the reduction of the cost and reduce the cost of business, the promotion of cases, the order also drops, so there is A considerable part of the factory in the town this year's situation is very delicate, continue to go on operating according to the current way, cannot see good prospects, such as 18 w wash wall lamp monochrome mid-range products ex-works quality assurance for two years before the unit price is in 100 yuan or so, but this year many factories of advertising has A 48 yuan, how is this product made, how to keep two years all don't say, the question is where is the factory profit, factory where the follow-up maintenance costs, A wash wall lamp artificial cost, A skilled workers is the output of more than 20 A day), shell, lamp beads, drive, lens, stents, aluminum plate, wire, glue (fill plug of resin, glue fixed before the wrinkles on both sides of the glue, 705 glue, potting A, B glue, fixed the glass glue) artificial these is A product of the materials and artificial cost (not including operating costs), believes that many customers can produce big budgetary estimate of the cost, so now the factory does not have the profit space set aside to, finally put himself and many of his peers are pushed to the wall.Actually you also know that any one line does not have enough profits, a product's quality and after-sales service to rely on what to guarantee, the original 3 w buried lights of the single color can pin to 60 yuan, and now many manufacturers selling price of 30 yuan, the cost of I am not here here, part of the manufacturers use inferior materials, cutting corners, light source with lack of power, power supply with low current, craft sloppy, no unified standards, the chaos of the unit prices, necessarily causes of quality control, a no quality assurance products to win customers trust and cooperation for a long time, one doesn't even have their own interests guarantee factory how to survive for a long time? And, of course, some people say that more closely to the market, but blindly cater to the guest's requirement at a lower price, but at the expense of practice obviously it would be unwise to product quality, with the biggest selling integrated project-light lamp now, for example, 50 w project-light lamp now the mainstream of ancient shell of 2.7 KG of single price is $47, other light source and driver is not guaranteed for two years product gross margins with 20, 180 yuan, and now someone selling 50 yuan a 50 w products, this product can keep two years?Is 50 w?I think whether guests or factories in the mind clear, this product is to fool people, everybody together, the result is the sale in domestic market is not hot now, most of the export is too cheap cheap product, a 3 w light cup has more than two yuan, a ceiling more than 3 yuan, these estimates production people told him to take back to himself with his all don't, but now is everywhere.In town knows, the characteristics of ancient town is the mature industrial chain, LED low barriers to entry, there are many other factors, but no matter what factors, all of this with LED products marked by churning out bad impression. But in the face of today's slack season, LED manufacturers how to survive, how to occupy a good position in the future production sales, because there are these low-end couldn't even say is low, let's just say it's only a product, an irresponsible products.How to with these cabbage prices product than the price, and how to complete product quality guarantee? One, to reduce the chip junction temperature (guzhen no enterprise can solve this problem, because there is no chip manufacturers, the ancient town of our country also does not have several mature chip manufacturers,, of course, the government should pay attention to this matter, should also have this aspect of the research and development, just less than civil phase) Second, through the shell heat quickly, reduce the junction temperature of the chip Before someone designed a fan of LED street lights, heard that this will reduce the service life of the light source, but before a the first step. Shell design the same in the market now, and is the specific heat dissipation requirements regardless of the chip, blindly reduce the thickness of the shell, to reduce the cost, at the expense of the service life of the light source, cause necessarily (heat dissipation is not enough light of light before failure), there's a shell inlay before pure copper (contact with the part of the chip, so the cooling effect of irremediable, but because the process requirements is not easy to achieve, the other is the cost of the product has soared, their product promotion is also struggling, but there are also the little people on the product structure adjustment, but the cooling effect is limited, such as improving profile shapes and so on, from these forward-looking manufacturers also rough we see LED the life of the future must be more high direction with lower cost, and in order to lower the consumption of natural resources, to achieve the real green environmental protection. Three, driving scheme of improvement Driver for two years now it is commonly the limit, in addition to less parts like Ming weft three years and five years, these aspects need to improve, now on the market of the inside of the driver electrolytic general design life is 5000 ~ 8000 hours, if the point eight hours a day, the driver can use time is between 1.7 ~ 2.7 years, but the mainstream use is 5000 hours of capacitance, these advertisements placed with them a considerable discrepancy, that kind of a piece of much money driven electrolytic estimated average 5000 hours of life is short, and driver IC, fire cow is also vulnerable components, so the improvement of driver is the key.

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