What is an LED panel lights

Posted on February 23, 2012 by admin

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The LED panel lights is a high-end indoor lighting, and its external borders are made from aluminum by anodic oxidation, light source for the LED, the entire lighting design is beautiful and

simple, luxurious atmosphere, both good lighting effects, but also brings America s feelings. LED panel lights
Unique [1] LED panel lights, light glow after a high transmittance of the light guide plate to form a homogeneous plane uniformity of illumination, light and soft, comfortable and yet

bright, can effectively relieve eye fatigue.
Considered from the green lighting design, LED panel light materials, environmental protection, power consumption, the luminous efficiency, lighting levels are superior to the Grille, truly

daytime lanterns, night lighting. Is gradually replaced with T8 fluorescent light Grille. The LED panel lamp life is 10 times that of the fluorescent
LED panel lights installed in various forms, easy to install:
1, mounted on ceilings, walls and installation of the surface;
2, can be suspended below the ceiling or install body. When mounted on a white ceiling, the whole smallpox was the same color, very beautiful, clean, and coordination;
LED panel light uses a broadband voltage design (AC100-240V/50-60Hz), can be used in countries around the world; high-power LED with isolated power, constant current or constant voltage

drive, high efficiency power on the grid non-polluting, stable performance, security reliable;
LED panel lights is a new type of surface light source similar to the LCD TV backlight technology, light and soft, pleasing in appearance, has been widely favored by European and American

customers, a large number of foreign-Buy quality, good service, the price of a good product and supply of the panel lights business;
LED panel lights seem just a simple paragraph of lighting, but because of its high market position to determine the quality requirements of customers for this product is extremely harsh,

coupled with the product itself related to materials, optical, structural, hardware, electronics and many other a field, there is no complete development team, and adequate experience in the

development and subsequent supply chain management capabilities, is difficult to truly successful development of understanding, coupled with the market requirements is not clear, so a lot of

development costs go to vote in exchange for a client does not endorse products.
The concept of the LED panel lights
The LED panel lights is a high-end indoor lighting, and its external borders are made from aluminum by anodic oxidation, light source for the LED, the entire lighting design is beautiful

and simple, luxurious atmosphere, both good lighting effects, but also brings America s feelings. The unique design, LED panel lights, and light after a high transmittance of the light guide

plate to form a homogeneous plane glow illumination uniformity, soft lighting, comfortable and yet bright, can effectively relieve eye fatigue.
Installation of the LED panel lights
1, mounted on ceilings, walls and installation of the surface;
2, can be suspended below the ceiling or install body. When mounted on a white ceiling, the whole smallpox was the same color, very beautiful, clean, and coordination;
LED panel light uses a broadband voltage design (AC85-240V/50-60Hz), can be used in countries around the world; high-power LED with isolated power, constant current or constant voltage

drive, high efficiency power on the grid non-polluting, stable performance, security reliable;
LED panel lights is a new type of surface light source similar to the LCD TV backlight technology, light and soft, pleasing in appearance, has been widely favored by European and American

customers, a large number of foreign-Buy quality, good service, the price of a good product and supply of the panel lights business;
LED panel lights seem just a simple paragraph of lighting, but because of its high market position to determine the quality requirements of customers for this product is extremely harsh,

coupled with the product itself related to the material, thermal, optical, structural, hardware, electronics a number of areas, most companies do not complete development team, and

sufficient experience in the development and subsequent supply chain management capabilities, it is difficult to truly successful development, coupled with awareness of the uncertainty on

the market requirements, so a lot of development costs go to vote in exchange for only A customer does not endorse products.
The scope of application of the LED panel lights
LED panel lights are widely used now instead of the trend of the grille; LED panel lights are mainly used in:
1, ceiling (instead of the original grille);
2, a wall (not just as a lighting purposes, artistic embodied);
3, install the body (the pursuit of practical and artistic combination of easy and convenient installation);
Other (can also be used in other places, such as cars, counters, etc.);

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Flux is dangerous chemicals

Posted on February 23, 2012 by admin

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Flux composition
In recent decades, in the process of electronic product manufacturing soldering process, the general make more use of rosin resin, mainly composed of rosin, resin and halide-containing active agents, additives and organic solvents, Department of flux. Such flux can be welded good, low cost, but after welding residues and residues containing halogen ion, will gradually cause the electrical insulation performance degradation and short-circuit problem, to solve this problem, rosin resin, Department of Electronic PCB to help flux residue cleaning will not only increase production costs, and cleaning of flux residue cleaning agent of the Department of rosin resin CFC compounds of this compound is the atmospheric ozone layer depleting substances, belonging to the disabled and out of the list is still many companies follow the process belongs to the foregoing using solder rosin-resin flux and then the process of cleaning agent, low efficiency, high cost. no-clean flux is the main raw material for the organic solvent, rosin resin and its derivatives , synthetic resin, surfactant, organic acid activator, anti-corrosive, cosolvent, into a film. Simply put, a variety of solid ingredients are dissolved in various liquids to form a uniform and transparent mixed solution, in which the various components of the proportion of different, the role of different.
In organic solvents: ketones, alcohols, esters of one or several mixtures commonly used ethanol, propanol, butanol; acetone, toluene, isobutyl ketone; ethyl acetate, butyl acetate, etc. As the liquid composition Its main role is to dissolve the solid ingredients in the flux so as to form a uniform solution, easy to be welded components evenly coating the right amount of flux ingredients, it can at the same time cleaning light dirt and metal surface of the oil spill. natural resin and its derivatives or synthetic resin
Surfactant: halogen-containing surfactant activity, high flux, but the halide ions is difficult to clean, high ionic contaminants, halogen elements (mainly chloride) has a strong corrosive, it is not suitable for use as no-clean flux materials, halogen-free surfactants, the activity is slightly weak, but less ionic contaminants. surfactant is the fatty acid family or aromatic non-ionic surfactant, its main function is to reduce the solder both contact with the lead foot metal surface tension, and enhance surface wetting force, and enhance penetration of the organic acid activator, may also play the role of the blowing agent
Organic acid activator: composed by one or more organic acids dicarboxylic acid or aromatic acid, such as succinic acid, glutaric acid, itaconic acid, o-hydroxy benzoic acid, sunflower acid, pimelic acid, apple acid, succinic acid, etc. Its main function is to remove the oxides of lead the feet oxide and molten solder surface, is one of the key components of flux
Anti-corrosive: reducing resin, activated, etc. solid component residual material after pyrolysis
Cosolvent: to stop the trend of activation agent composition of solid solution desolventizing avoid poor activator of non-uniform distribution
Into a film: the lead foot solder process, the coating flux precipitation, crystallization, forming a uniform layer of the membrane and its pyrolysis residues by the existence of successful film former, fast curing, hardening, reducing the stickiness.

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High Voltage LED will dominate the future of LED general lighting

Posted on February 23, 2012 by admin

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Recently, many sites are given extensive coverage to a "high-voltage LED, it is a new LED variety, and has many advantages, and

even that it will make today s low-voltage LED will fade out the future of LED general lighting market" high-pressure LED will

"lead the future of LED general lighting, is it really?

We know that the Chinese of the LED is a light-emitting diodes, it is basically just a "diode". And work in a positive diode. Only

the high back pressure diodes, it refers to a high reverse breakdown voltage. If the work is positive, then, must be the higher

the voltage, the greater the current. But the most important feature of this high-voltage LED is a high-voltage, low current. That

is how it goes?

I. What is a high-voltage LED

A closer look at the original, it s just a lot of 20mA low-power LED series, into a so-called high-voltage LED. Many low-power LED

series is nothing new, in fact, has long been so used in many lamps. The only difference is the lighting manufacturers in the past

are a good package, low power LED series. For example, Figure 1 is Shanghai Longxing 80 surface mount 0.1W power LED all in series

up to high voltage current characteristics for the LED bulb.
Is provided by the LED manufacturers a good series low-power LED, and call it "high-voltage LED. It s just integrated a LED. In

fact, the past has long been integrated LEDs, a different number of LED strings in parallel, a variety of different power and

voltage LED. It can be said that the first Puri (of Bridgelux) Company has launched this integrated LED. That is, a lot of small

power LED on the substrate series and parallel up to a high-power LED. They call it the LED array, and in 2009 launched a 30W LED

array BXRA-C2000 is actually 25 1W LED chip 5 and 5-string derived to its size 25.3×22.3mm light-emitting surface diameter is

17.5mm (Figure 2), the forward voltage of 16.6V, a forward current of 1.75A, thermal resistance of 0.5 ° C / W
The high-voltage LED and integrated LED main difference is that the high-voltage LED all in series, while the integrated LED is a

series-parallel. The integrated LED is characterized by the slotting method in a large chip to be cut into many small LED groove

depth of about 4-8μm grooves can not be too wide so as not to reduce the light-emitting area. Out of the trench to connect the

wire of each LED in order to be laid, but also with the insulation trench filled before putting the appropriate aluminum wire in

accordance with the requirements of series or parallel.
Two high-voltage LED performance indicators

Only know that Taiwan s Epistar is the production of such high voltage LED
Advantages and disadvantages of three high-voltage LED

What we in the end of this high-voltage LED advantages and disadvantages.

Power dissipation and heat sink size: some reports claim 1W high-voltage LED voltage of 50V, current 20mA; ordinary low pressure

1W LED voltage is 3V, current is 350mA, so the same output power high-voltage LED power dissipation in the work is far lower than

the low-voltage LED, which means that the cost of cooling the aluminum casing can be greatly reduced. "(see

html), this argument obviously is not established. The size of the

power dissipation is mainly determined by the LED luminous efficiency, rather than by its nominal power of the decision. The

nominal power is not equal to the input power. If you want to determine the size of the radiator, should be calculated in the same

luminous efficiency. Usually considered 100lm / W luminous efficiency of the electro-optical efficiency (that is, from electrical

energy into light energy efficiency) is only about 30% is only 30% of the energy is converted to light, and the rest 70%

electrical energy is converted into heat through the radiator to disperse. So for the same luminous efficiency of 1W high-voltage

LED and low voltage LED, part of turning it into heat are 0.7W, you need to dispersed through the radiator. The size of the

radiator needed in this high-voltage LED will not make any difference to the case of the same input power and the same drive power

efficiency.

2 AC / DC converter efficiency: In the same article that "the lower the pressure difference of the input and output, AC to DC

conversion efficiency is higher. The paper also 220V input voltage LED 4 series is 200V and 220V only a thin 20V. Low voltage LED

10 series forward voltage drop of only 30V and 220V a big difference. "If the high voltage the LED, the efficiency of the

transformer can be greatly improved, thereby significantly reducing the power loss when the AC-DC converters, reduction in the

heat consumption can be further reduce the cost of the cooling shell." Is actually done to the AC / DC constant current drive

people know, the AC / DC converter efficiency is almost nothing to do and the final output voltage. May transformer secondary

current will increase the copper loss, but this is very small, have no effect on the design of the radiator. The real impact of

the efficiency of the AC / DC converter, there are many factors, such as non-isolated converter efficiency is much higher than the

efficiency of the isolated converter (usually non-isolated converter simply do not have transformers, as long as the transformer

regardless of change ratio is how much will be greatly reduced efficiency); In addition, the loss will also affect the efficiency

of the isolated flyback output rectifier diode, the best order to improve the efficiency of the rectifier diode with Schottky

diodes, and if the output is 200V high voltage, it is difficult to buy such high-voltage Schottky diodes, even if the buy price is

very high, if we adopt the same inefficient ordinary rectifier diodes, its efficiency can not improve. . So that the output

voltage can greatly reduce the converter power loss, or even to reduce the cost statement of the radiator is inaccurate.

(3) high-voltage LED reduces the LED area, "Indeed. For example: For a 36W LED 36 1W LED it will occupy a large area, and if an

integrated 36W high-voltage LED, then they are only a small area (Figure 3). This appears to be advantages, but from a cooling

point of view may not be an advantage. If the two luminous efficiency are the same, then they will be the heat is the same. To be

distributed in a small area of ??a lot of heat in radiator design will be a big problem.

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To explore the LED light failure causes

Posted on February 22, 2012 by admin

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wall pack – China Manufacturer
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Currently, LED luminous intensity, luminous efficiency, life has been greatly improved, and the rapid commercialization, has been

widely used in image display, signaling and lighting in the area, the development of hot spots to become the lighting technology.

Compared with conventional light sources of incandescent and fluorescent lamps, LED has small size, low heat, low power

consumption, fast response, shock, high brightness, no pollution, etc., worth looking forward to the development potential of

lighting market within 10 years is expected to become alternative to traditional lighting apparatus of a potential commodity.

Theory that the LED life of up to 105 ~ 106h continuous lit up more than 10 years or even 100 years, life is not bad a light.

However, from a white LED in 1996 the birth date, but more than 10 years, how can we determine the life expectancy of the LED up

to 106h? The actual life of the LED to become one of the most concern in the industry

      LED light failure light in the transmission of the signal weakened, while the LED products made by this stage the global

LED manufacturers have different degree of light fades, high-power LED is also bad light, and temperature have a direct

relationship, the main is determined by the chip, phosphor and packaging technologies. Currently, the market white LED light

failure may be one of the most important issue to march to civilian lighting. LED light decline is mainly the following two

factors:

First, the LED products quality problems:
1, the LED chip physical good, the brightness decreases rapidly.
2, the production process defects, the LED chip cooling can not be a good exported from the Pin, resulting in the high

temperature of the LED chip chip attenuation intensified.

 

Second, the conditions of use:
1 LED constant current driver part of the LED voltage drivers of LED attenuation over.
2, the drive current is greater than the rated drive conditions.

In fact lead to bad light LED products, the most important thing is hot, although many manufacturers in the secondary products is

not particularly pay attention to the problem of heat dissipation, but the long-term use of these sub-LED products, the light

fades extent than to have to pay attention to the heat LED products. The thermal resistance of the LED chip itself, the influence

of silver plastic, the cooling effect of the substrate, as well as colloidal and gold thread and the light fades there.

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The threshold of market access

Posted on February 22, 2012 by admin

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"In 2015, Guangdong province, the LED lighting industry market size will exceed 80 billion yuan, the Pearl River Delta region will become a world-class LED lighting industry gathering area."

Recently, the province s LED lighting industry work conference held by the Guangdong Provincial Government, the Pearl River Delta region to build world-class LED lighting industry with the "timetable" has become increasingly clear. The provincial government require municipalities to establish joint meeting system, and promote the implementation of the plan.

The first step is to speed up the localization of the promotion of LED lighting. Implementation of the program under the Guangdong Province to promote the development of semiconductor lighting industry, Guangdong will strive to 2012 in key cities to the promotion of LED lights to build a total length of 6000 km, 400 000 scale of the LED street lamp demonstration project, the overall saving more than 60% annually saving more than 3 billion kwh.

To further this work, from July 1 this year, Guangdong has released the first and the implementation of the first LED lights local industry standard file – Guangdong Province LED lights local standards.

Yang Xue, Director of the Industry Management Department of the Provincial Information Industry Department, said the Guangdong the lead in developing this standard, and is conducive to "raising the threshold of market access, promote good business to be poor business can force the upgrade".

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super bright LED features

Posted on February 22, 2012 by admin

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When a positive voltage exceeds a certain threshold (about 2V), commonly known as the turn-on voltage can be similar to that, IF

and VF is proportional to. Table is a major super bright LED s electrical characteristics. LED light properties are usually

described as a function of current, and not a function of voltage Flux (φV) and IF curve, therefore, constant current source

driver can better control
LED middle ad 300 * 250
When the forward voltage exceeds a certain threshold (about 2V), commonly referred to as the turn-on voltage can be approximated

think, IF and VF is proportional to. Table is a major super bright LED s electrical characteristics. Since the LED s optical

properties are usually described as a function of current, not voltage function, Flux (φV) and IF curve, therefore, a constant

current source driver can better control the brightness. In addition, the range of the LED forward voltage drop is relatively

large (up to 1V above), while the VF-IF curve in the figure above shows VF small changes can cause large, the IF changes, causing

the brightness of the more big changes. Therefore, the constant voltage source driver can not guarantee the consistency of LED

brightness and affect the reliability of the LED life and lumen maintenance. Therefore, ultra-bright LED is usually a constant

current source drive.
The following figure is an LED temperature and flux (φV) curve by the following figure shows the luminous flux is inversely

proportional to temperature, 85 ° C the luminous flux is half of the 25 ° C, while the output of a 40 ℃ time is 25 ° C 1.8

times. Temperature changes the wavelength of LFD also have a certain impact, therefore, good heat dissipation of LED brightness

constant assurance.

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Copper for Songtao Bureau exchanges melting ice hit the ground running

Posted on February 22, 2012 by admin

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Live 26 minutes, 4 km ice melting.

Live 26 minutes NEEDHAM melting ice as RBS-3150/10 type power transformers up to 32 mm in diameter icicle splashed out on the ground along the transmission line, the scene is a cheer … This is the January 6 , copper for carrying out exchange of the scene of melting ice the Songtao Power Supply Bureau in the high altitude mountain – the Shiliang Township 10 kV Shilianghe line branch line of leather good.

Day, due to the Songtao Autonomous County of continuous cold weather, resulting in the watershed segment of 1200 m above sea level Shiliang Township Snow Storm, leather good branch line of the 10 kV Shilianghe lines, thickness of the ice cover of 10-16 mm. To ensure that the Songtao with safe and stable operation of the grid lines and reliable power supply to users, copper Zhao, Deputy Secretary for the Songtao Board in charge of safety production person site Zuozhen command, biotechnology, safety supervision, repair test, scheduling, change electricity sector, as well as Uro, more than 20 of Shiliang supply Staff closely with over the years, the first exchange of melting ice of the section line, a complete success. According to reports, ice-melting device, Taiwan RBS-3150/10 AC 35/10 kV power transformer winding adapted from the principle of the 35 kV winding transformed into a 4 kV for the connection of the output shorted transmission lines need to melt ice and melting ice within the effective distance of the end of the line short-circuit current on the transmission line loop heat to heat up, apply to the harsh climate and environment, geographically isolated and transmission of high-altitude mountain line melting ice.

After 16:17 this RBS-3150/10 melting ice power transformers charged, 216 security of the initial input current, output current 56 A; just four minutes, the line current changes, A, B, C three-phase relative to the output current into 195 Ann, 204 Ann 203 Ann and three-phase input current to a 55-An; conductor temperature rise gradually from minus 3 degrees to 12 degrees above zero. Ice cover as the wire temperature is gradually falling. 16:43, the entire line length of 11 km, the actual ice cover 4 km line completed, melting ice, and play an immediate effect to ensure the stable operation of the power supply of the transmission line.

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Nanjing steel distributors stockpile prices

Posted on February 22, 2012 by admin

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Yesterday, there was news that the price of iron ore negotiations this year have been identified to rise about 40%, the news did not get the confirmation of the major steel enterprises. But the rise of long association has no suspense, steel product prices to rise has been expected of them, recently, Nanjing ground steel stocks reached a new high last year, dealers have been waiting for prices to hoard goods.

Spot prices of the signals,

Some foreign media reported that several major Chinese steel enterprises with foreign mining enterprises to enhance iron ore prices reached a tentative agreement price, selling price than the long association with Japan and South Korea reached last year rose 40 percent, to $ 84. The domestic steel prices did not confirm the news. Last year, China imported a total of 630 million tons of iron ore, the total amount of about 50.11 billion U.S. dollars, converted the average price of $ 79.8 / t of the annual imports of iron ore, the industry expects this year s iron ore price is higher than the $ 80 no suspense .

The side raw material prices in the up side of steel can not wait to raise prices. Chinese New Year holiday just after the steel giant Baosteel has been first announced, raised product prices in March, or -700 yuan, 200 yuan / ton range.

According to the material procurement field in Nanjing before the holiday week and postganglionic steel prices stable, there has been no significant rise, mainly due to a small volume is expected after the start of each construction site, prices will be shown .

Dealers to consider stockpile

According to data provided by the material procurement, as of yesterday afternoon, the market inventory of standing timber in Nanjing reached 18.23 million tons of sheet stock reached 21.45 million tons, up 35 percent from the pre-holiday, setting a new high since last year. "High inventory, on the one hand because the market demand after the Chinese New Year is not open, the more important reason is the dealer for the high expectations of price increases, prices will have risen in previous years, the Spring Festival this year, plus the news of iron ore prices dealer prices and stockpile. "site analyst CDC.

Nanjing has said steel distributor, Baoshan Iron and Steel products price is the benchmark of the market price of Baosteel could not carry the pressure of the iron ore prices, steel futures prices also rose to a stop, the spot price to rise up, so appropriate to hoard point goods, their choice is rebar.

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The POSCO large make overseas acquisitions

Posted on February 22, 2012 by admin

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South Korea s Pohang Iron and Steel (Posco) is expected to hand over the six quarters since the best profit performance, the future profitability of development depends on one after another recently proposed $ 30 billion overseas expansion plans progress.
Pohang chief executive Zhengjun Yang last week announced the India the Orisa investment plan to be increased to $ 12 billion, from $ 7 billion; was also announced to set up factories project in Indonesia $ 6,000,000,000. Coupled with investment in Viet Nam, Pohang expected to take the fifth largest steel plant from Asia to regain top spot.
 Pohang is Warren Buffett s investment targets, is Asia s best profitable steel plant. But the company s share price last year rose 63 percent drop to 89% of the 后阿赛洛米塔尔. China s Baosteel and South Han Dayu Steel each have doubled or. Analysts optimistic about, Pohang Iron and Steel shares rose 3 percent to 625,000 won in the 11th.
February last year, 61-year-old s Zhengjun Yang took over the CEO position, will soon celebrate the first annual profit report that his office. Zhengjun Yang came to office committed to regain Baosteel claimed the first position in Asia through investment and mergers and acquisitions. Analysts said that, Pohang has a clear understanding of the domestic demand is difficult to grow through overseas investment to expand the career.
 Pohang published in 14 Japanese and Korean stocks after-hours 10-12 quarter earnings reports. Bloomberg s visit to the tune of analysts forecasts, the Pohang profit is expected to double to 1.37 trillion won ($ 1.2 billion), which will be the largest quarter increase in the Pohang three years.
POSCO spokesman said the company also announced investment plans for the 2010 year will be on the same day. The Korea Economic Daily News reported that POSCO plans to invest 10 trillion won this year, not citing sources.
The past year, the Pohang series of mergers and acquisitions in Vietnam stainless steel company in Asia, South Korea TaihanST, and is approached the acquisition Thailand Tainox Stainless. Zheng Junyang approved a series of factory expansion plan in the United States and China, and is now studying the tender offer heavy rains International Group, the group $ 4,000,000,000 natural gas investment projects in Myanmar. Plant expansion and mergers and acquisitions plan will Pohang capacity amplification of 28 million tonnes, equivalent to 2008 annual production capacity of 3,310 million metric tons of 85%. Orisa and development project in Indonesia alone, it is expected to allow POSCO shares jumped 60,000 won, an analyst at Samsung Securities, Kim Jin-Zhong

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New coal-fired boiler

Posted on February 22, 2012 by admin

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blast furnace – China Manufacturer
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 Coal is a solid fuel, when burned, it needs to give it certain conditions we can achieve full combustion, although people have sufficient knowledge, but did not completely break through the

difficulties of the point of combustion, and therefore replaced by the new fuel. This is not the intention of the boiler design. But the indirect remedies.
I also tried the boiler design and testing of the years of using the radiation burning, the temperature of the furnace to achieve full combustion of solid fuels must be temperature

conditions, due to the increase in temperature furnace with the outside world a lot of temperature difference accelerate the ventilation oxygen, the combustion of natural ventilation.
Fuel combustion, design alternating friction and heat transfer medium and high temperature flue gas to form alternating friction; axial direction 360 degrees, 180 degrees vertical, the

entire heat released in a full range of reciprocating recovery furnace, The exhaust gas temperature is reduced to about 140 degrees.
Take full advantage of the full combustion and re-use of exhaust energy forced landing soot deposition and desulfurization; the concentration of dust emissions can be controlled below 100 mg

/ m, the use of this new design, you can easily solve the burning coal boiler technical problems.
This is a boiler last way to go in the future, more gas, electricity, oil for other can not use coal for fuel powered mechanical equipment, the reasonable use of the fuel; also realized the

requirements of environmental protection.

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