月份：2012年6月

Technology trends of the led lights chip

Tony Armstrong, Linear Technology Power Products Division director of product marketing, with the further development of the LED, its effectiveness or the ability continue to improve. Secondly, LED lighting have environmental protection characteristics, which no need to deal with exposure and disposed of in a common toxic mercury vapor in the cold cathode fluorescent lamp. Finally, incandescent bulbs, and often need to be replaced after about 10000 hours. However, the led lights can provide over 100,000 hours of life. These figures are outshone.

Texas Instruments (TI) Business Development Manager Han Gan analysis, it is well known that the LED driver model high ambient temperature, and the module thermal conditions is poor, leading to the LED Panel driver circuit has been working at higher temperatures, which will lead to the reliability of the led lights applications reduce, and shorten the life of a series of questions. So the heat had to highly considered. Reliability and safety regulations is very easy to ignore and part, especially before the enforcement of relevant provisions, in order to reduce costs, part of the LED lighting manufacturers will be omitted reliability and safety circuits, but this is precisely the long-term fundamental of the led lights industry developing and also the embodiment of the design capacity of LED driver chip manufactures. Different chip manufacturers provide programs, which increase the costs vary greatly.

The accumulate Technology Co., Ltd. Product Director Yu Zhongwei think that it should be noted that the shape of the trend of standardization, such as the US Energy Star and Japan PSE specification. In addition, the dimming feature is more and more noticed. Such as the traditional SCR dimming 1-10V dimming, as well as DALI dimming. Finally, it is to address the thermal issues arising from the requirements of the driver program. In addition to cost considerations, a more lightweight requirements, but also must take into account of the better electrical characteristics(efficiency, power factor, electromagnetic interference, output ripple, etc.)

Semiconductor lighting market, technical marketing manager Lin Zhiyan said LED Tube is essentially a low-voltage devices, depending on the color and the current, its forward voltage drop may vary between 2 to 4.5 V, and it requires a constant current to drive.

The perplexity faced by solar LED street lamp energy management contract model

According to the characteristic of “contract energy management”mode, a comprehensive analysis of the LED lights on the confusion of the process of implementation of  ” contract energy management “mode, and proposed the government to play a lending role, which is the current implementation of solar led street lamp in the city.

The perplexity faced by solar LED street lamp energy management contract model

As energy consumption country, China unit of GDP energy consumption is 3 times higher than in advanced countries. The production of specific power consumption of unit product is high from 50% to100% than developed countries. China is undergoing the transition from planned economy to market economy changing period. The original planned economy energy saving management system of solar led street lamp is more and more which can not adapt to the new situation, therefore, it is necessary to introduce and popularize energy-saving work based on market mechanism of energy-saving investment and service.

Energy management contract (EMC) is the arisen new energy conservation mechanism in the last century of 70’s. It is through energy service contracts signed with clients, for clients including energy audit, project design, project financing, equipment procurement, project construction, equipment installation commissioning, personnel training, recognition and energy saving service. And from the customer for energy saving in energy efficiency obtained profits of a business operation. Its essence is to reduce the energy costs to pay the full cost of energy saving project investment. This energy-saving investment mode allows the user to use the future energy-saving benefits for plant and equipment upgrades, reducing the operation costs, improving the efficiency of energy use.

The pattern has the following characteristics for solar led street lamp: one is the energy consumption enterprises without funds to complete the energy-saving technological transformation, which is so called “zero input”. second is the EMC liable for technical and economic risks, energy consumption enterprises pay to EMC payments from energy saving the project benefit, the user” zero risk”; three is the end of the contract energy saving equipment saving equipment and follow-up. and all the energy efficiency go back to energy consumption LED Downlight enterprises.

Contract energy management to a great extent handled the factors which emerged in energy conservation. It achieve win-win situation, and indeed a effective energy-saving invest mechanism, new pattern, which can be popularized quickly in the market mechanism and become the mainstream model of energy saving investment in Europe.

t8 high bay and led backlight

LED-backlit display has been a gradual increase in the proportion of the  notebook screen application, estimated that there will be more than 15% penetration rate in 2014, compared to conventional CCFL LCD screen, LED High Bay Lights (t8 high bay) has lower power consumption, thinner, better The color performance and other advantages, to meet the requirements of the consumer notebook battery work longer hours, more lightweight body, the color is more brilliant.

t8 high bay and led backlight

LED  (t8 high bay) is a way to directly convert electrical energy into light energy semiconductor components with traditional LCD CCFL light compared to the many advantages of LED backlighting technology. Notebook LCD panels, which are arranged in groups on the bottom of the form instead of the traditional thin tube. LED Lights instead of the thin tube, the original light guide plate thickness and a wedge-shaped design was canceled, and turn the light guide plate with uniform thickness and can be the thickness of the overall reducing.

The same time, the LCD system board can be placed to the bottom of the screen to integrate without superimposed on the screen, which is the reduced thickness of the entire LCD screen one of the reasons. Screen with LED backlight technology can achieve the purpose of thinner, lighter and more energy-efficient, this notebook is one of the most conform to their development, thinner and lighter has always been the direction of growth of the notebook computer products If you look at the recent Apple’s new world’s thinnest only 1.94 cm, the MacBook Air, you can feel this trend.

Notebook LCD screen with LED backlight with CCFL backlight to save power and lower power consumption makes the battery life of notebook battery capacity is unchanged longer. The other LED  (t8 high bay) with a relatively low voltage can work more secure than require high voltage to the CCFL. The display has always been a major energy consumer in the notebook computer, notebook battery life is too short, this advantage of the LED Products is attractive.

LED-backlit display screen is not perfect, the shortcomings are in terms of color saturation, in addition, its brightness is not strong enough, should be less than the current mainstream of traditional CCFL LCD brightness.

 

The future of new led lighting will subvert the concept of the lamp

In the large-scale entered ordinary families, many people are very curious. Future LED Lights lamp would be like what it is? The United States Department of energy said: solid state lighting is 50 years in lighting field is the most disruptive innovation technology.  Many people in the industry agreed, and think that new led lighting is subversive products. It born to reform the traditional lighting. In the current exhibition, a number of innovative product LED stunning debut seems indicating a trend: lighting in the future may be rewritten lamp definition.
The future of new led lighting will subvert the concept of the lamp

For example, GE has introduced a slim, stylish Lumination Lumination Series LED lifting light this year. The design is forward-looking, its ultra-thin light guide plate and the edge set of LED technology, the new led lighting for maximum efficiency,  compared with fluorescent, it has a longer life of the slimmer, more innovative styling, enhanced dimming ability and sense of design, lighting designers and end users can also tailored. Individuality and creativity integrate home decorative lighting. OSRAM launch OLED lighting products – PirOLED, which uses five removable ORBEOS flat reflective light staggered maosaic in the double helix lampholders. It can not only create excellent visual effects, but also send a beautiful diffused light.

“Now we see most of LED lamp, LED bulb lamp in the shape of our basic and traditional fluorescent lamp bulb.  GE Asia-Pacific LED lighting products general manager Wang Jian said,  it is because the LED lighting applications has just started, mainly to replace traditional lighting for the mission. The design is similar in appearance just considering that it is convenient to replace the traditional lamp concept of idea and easily accepted by consumers. In OSRAM Wu Shenbo of  Asia-Pacific division president seems simple, actually it does not reflect the LED’s best performance and features itself if it is just according to the traditional lighting profile produced by LED replacement lamps. New led lighting is a solid adjustable light source, which should display for everyone at its most ideal state.  LED small size, low power consumption, controllability characteristics, making it the release of the designer’s imagination more than traditional lighting.

power factor of t8 high bay fixtures

LED Lights, fluorescent or incandescent lamps, we have to understand one of the important parameters – power factor (PFC).

1, power factor of LED High Bay Lights

The power factor characterizes the ability of the lamp output active power. Power is a measure of the energy transfer rate in the DC circuit voltage V and current A and the product (t8 high bay fixtures). In the exchange system is far more complex: that part of the AC current in the loop where the load does not transmit power, it is called reactance current or harmonic current, it makes multiplied by current in the power (voltage Volt Amps) is greater than the actual power.

2, the apparent power of LED Flood Lights

power factor of t8 high bay fixtures

As the product of power: AC voltage and AC current. Formula is expressed as: S = the UI. Where S is the rated output power  (t8 high bay fixtures), the unit is VA (voltammetry); U is the rated output voltage, the unit is V, 220V, 380V, etc.; I is the rated output current, the unit is A Apparent power includes two parts: the active power (P) and reactive power (Q).

(3) reactive power
Lamps and all other electronic rely on the DC voltage circuit, leaving the reactive power does not work. General users that the lamps and the like devices will require the active power, without the need for reactive power. Since the reactive power is not acting, you want it and where to use! So of course they think that the power factor is one of the lamp. Because it gives the maximum output power. However, the reality is not the case.

A lamp when the AC mains input rectifier, pulsating DC voltage, if the ripple voltage of any processing, it is provided directly to the lamp, no doubt, the circuit did not work. When the lamp  (t8 high bay fixtures) power factor close to 1, but this is what to use it. In order for the lighting circuit to work properly, must provide a smooth DC voltage. “Smoothing” must be performed by the filter capacitor connected to the lamp rectifier behind to complete. This filter is like a reservoir capacitor which must be stored a sufficient number of charge, when the gap between the half-wave rectifier circuit voltage remains uninterrupted, able to maintain a normal level.

t8 led fluorescent tube and heat sink

With global energy shortage and environmental pollution, the LED with its energy-saving and environmental features of the vast space, the application of LED light products are attracting the world’s attention in the lighting field. In general, the LED lights work stability,  no matter the quality is good or bad, and the lamp cooling is essential, the heat of the high brightness LED lamps (t8 led fluorescent tube) on the market, often using the natural cooling effect, which is not satisfactory. LED lamps, LED light source to create LEDs, thermal structure, drives, lens, so the heat is also an important part, if the LED can not be a good heat, it’s life will also be affected.

1, thermal management is the main problem in the high-brightness LED applications
P-type doping of III-nitride limited by the solubility of the Lord and hole higher than that of Mg activation energy and heat are particularly vulnerable in the p-type region; Sapphire substrates is extremely low thermal conductivity of the device thermal resistance increase, resulting in severe self-heating effect, have a devastating impact on device performance and reliability.

t8 led fluorescent tube and heat sink

2, the heat of high-brightness LED
Heat concentrated in a small size chip, the chip temperature rises, causing non-uniform distribution of heat stress, decline in the luminous efficiency and the lasing efficiency of the phosphor; the device failure rate increased exponentially when the temperature exceeds a certain value. The statistics show that the component temperature rise of 2 ° C, reliability decreased by 10%. When multiple LEDs (t8 led fluorescent tube) are densely packed composition of white light illumination system, the heat dissipation problem is more serious. Solve the problem of thermal management has become a prerequisite for high-brightness LED Street Light applications.

3, the chip size and the cooling of relations
The most direct way to improve the brightness of power LED (t8 led fluorescent tube) is to increase the input power is bound to increase the input power in order to prevent saturation of the active layer must increase the size of the pn junction. Single-tube power increases depends on the device the ability to export heat from the pn junction to maintain the existing chip material, structure, packaging technology, the current density on the chip the same and equivalent thermal conditions, a separate increase the size of the chip junction area The temperature will continue to rise.

Key technical bottleneck in track led lighting have new breakthrough

Over the past few years, prospect of LED develops fast but the household popularity of the process is very slow. “This is not just a price, production or other issue. In addition to consumer recognition problem, there are a number of technical bottleneck.” According to the China Illuminating Engineering Society director Wang Jinsui introduces, this leads to a commercially available track led lighting beans gall lights, LED down light, LED lamps, compared with traditional lamps, it still has very big difference, fass less well than said.

At present, the domestic market oriented with Trinity form of LED products. One of the three major key elements: source, drive power, heat dissipation. The light source is the part of the core products, chip technology mastered by Europe and the United Stated and Japan. Most domestic enterprises adopt buy the assembling way. Therefore, although the LED illumination threshold is not high, yet if you want to do well, it is necessary to solve two key problems–heat dissipation, driving power supply. In contrast, drive power challenges focused on outdoor lighting environment, while heat dissipation is for home used light to enter a large obstacle. According to industry sources, in Zhongshan Ancient Town, there are many LED assembly business, simply to put the track led lighting source assembly into the traditional lamp.  Heat, light and a two optical design is not just as one wishes. Life span can not obtaion the ideal value also.

LED cooling is not good, which will cause the light, and life span shorten. In the current exhibition, the reporter found that the technical problems have had new breakthrough. From the friends of Shenzhen completely subverb the ordinary LED heat, they first introduce the new fin type LED interior lighting series, modeling include ceiling lamp, cast light lamps. According to its general manager, it can save aluminum 4% or more above. The weight is the 1/3 of the traditional lamps. Through more efficient heat conduction and heat radiation, in order to meet the domestic LED relability and life requirements. According to several hundred watts of power LED heat problem, a new research — micro slot cluster compound phase-change cooling technology, become this year’s show is a prominent spot in this study.

t8 led light tubes problems

As the price of LED Lights compared to traditional light sources is a great disadvantage, how quickly the advantages of the LED really play out has become practitioners must face technical problems. To really carve out a new semiconductor lighting era, efforts to overcome technical problems but also from the following aspects:

1. to improve the LED (t8 led light tubes) luminous efficiency problems.
The main method of the LED luminous efficiency improving is to improve the structure and manufacturing process of the semiconductor light-emitting material and the LED chip. Since this part of the work requires a strong theoretical basis and advanced semiconductor process equipment, is still relatively difficult to achieve 200 lumens / watt target road. Although the traditional CCFL lamp power consumption is a little higher,  but the luminous efficiency can reach 50-100 lm / W luminous efficiency white LED devices in the nascent only 20lm / W, which doomed is not suitable as an LCD display backlight LED at the beginning. However, white LED Lamps luminous efficiency of an annual increase rate of 60% increase, so far, the luminous efficiency of white LED devices breakthrough 50lm / W, began to reach the practical level.

2. to solve the life problems of high-power light fades.
As lighting, luminous flux of a single LED (t8 led light tubes) output must be large enough to want to increase the flux LED, you must first inject a sufficient electric power. But the temperature rise of the LED chip can not be too high, otherwise the properties, especially the service life will be greatly affected. Clearly, the design of a larger input power LED components and lighting, in addition to the required larger chip, but also must have good thermal structure.

3. reasonable lighting structure design challenges
LED lighting by a number of LED tubes, the discrete nature of its parameters, also a technical issue. In addition to the pre-selection, classification, and try to ensure consistency, we must also design of the lamp structure (including the LED arrangement and location of the layout) and on an appropriate driver circuit, to prevent the occasional energy concentrated and burned part of the LED.

 

t8 led lighting for Miner Lamp

As the substantial increasing in luminous flux of the LED, high-power LED lighting applications become possible in more places. Because of the technology in research and development costs, technical applications, the use of the concept of reason, the cost is still relatively high, but a series of advantages inherent in such energy-saving LED lighting, longevity, safety, environmental protection, maintenance-free, as an application trends replace the traditional lighting can not be stopped. The successful application of high power LED lights (t8 led lighting) source in some special areas of lighting.

Miner belonging to the mine with explosion-proof lamps, miner’s daily working hours as long as 12 hours or more, and therefore the weight of the lamp and the lamp luminous flux,  discharge time and service life have high requirements for these indicators are often conflicting, requirements such as the lamp luminous flux, you need to improve the color temperature of light bulbs or increase the power of the bulb, but increase the bulb color temperature will greatly reduce its use life, frequent bulb replacement, increases security risks.

t8 led lighting for Miner Lamp

Increasing the lamp power is bound to increase the battery capacity to ensure the continuous miner working hours, the result is the lamp size and weight increase, the inconvenience to the miners to carry and work, so the miner use incandescent bulbs.

LED miner’s lamp has the following advantages:
1. using the most advanced fourth generation of solid state light source, the life of theoretically up to 100,000 hours.

2. the beginning of illumination (1 meter) up to 1200lux, lighting 11 hours after the illumination is still greater than 600lux effective in improving the working conditions of miners.

3 new high energy battery, small size, large capacity, and once fully charged, continuous illumination of not less than 15 hours.

Completely changed the traditional miner’s lamp and battery sub-structure model, weighs less than 200g, wearing very light.

The traditional miner’s lamp incandescent operating temperatures up to 2500 degrees, and high-power LED miner’s lamp LED Street Light(t8 led lighting) source operating temperature only 60 degrees less than that even if the lamp is smashed not detonate gas applications mature lithium power management technology, the fundamental solution to traditional battery short circuit, leakage, explosion risks, therefore, the LED Tubes future (t8 led lighting)in the miner will quickly replace the incandescent lamp miner’s lamp market.

 

The home smd LED lamps price is no longer superior

From October 1 this year, China will ban the import and sales of general 100 watts incandescent lamps, this is undoubtedly a good news for the LED entered into the civilian market. Lighting Far in Guangzhou last week, the pace of LED products for civilian R&D sudden acceleration, and a richer product applications. Although most commercial lighting regards display as the leading,  yet many companies also launched the home smd led lamps.

These new products have focused the different design on functions: warm light/cold light, some even can adjust the light color. Different from the past to create the relatively high-end products this year, manufacturers realized that the products close to life will be more popular. For example, how to control the light range of LED bulb? This type bulb can control light range and angle according to their needs, and also can meet the needs of different scenario’s space.

LED lighting on the commercial market is the trends. The international lighting giants have been optimistic about this future market. In this exhibition, the world’s second largest optical semiconductor manufacturer OSRAM display LED products with high quality, flexibility, easy to install characterization. The new launch of Prevailed of light engine, color rendering index of up to 90. Through the active color temperature control technology to maintain a high degree of consistency of light and color between the module to solve the smd led lamps, color cast phenomenon.

The design of the Philips booth is like a “light theater”, the scene of a transparent pyramid projected “waistline” 3D images. The most attractive is the two LED bulbs that are most suitable for mass consumption.

At present, China’s lighting industry is in revolutionary change period. Incandescent lamp will be eliminated, energy-saving lamps to be very influential. LED is just unfolding. Smd led lamps are a industry technical revolution, A LED lamp generally can save 70%~80% compared with energy-saving lamps. The life is 4 times than energy-saving lamps, but the price is 3 to 4 higher than energy-saving lamps. High price become a barriers for household. In the current exhibition, on Shun lighting in LED civil lighting ofr a new breakthrough, a 7W bulb of 3 pieces only need 100 yuan. Corresponding to the traditional lamps with 33 yuan, which is more expensive, but compared with the mainstream brands of energy-saving lamps, the price gap is substantially reduced.