Tag Archives: led strip

Juno led downlight industry at the shuffle

20 Jun

led strip lighting market demand for raising temperature, in 2011 the size of the market is expected to reach annual growth of the above, along with the LED lighting is regarded as the most robust growth LED industry future application market, all LED lighting of the layout of the company in field will become the next wave forces the key industry growth, at present, the LED upstream of the grain industry LED lighting of revenue in the proportion of whole about 2 ~ 3 into, but FengZhuangChang downstream steps of progress is differ, benefit is relatively slow appeared.

According to the market estimates that 2010 year led 12v downlight penetration rate in about 4% ~ 5.5%, and 2010 year LED lamp hair smooth effect though rate and fluorescent lamp is consistent, but 2011 years is expected to challenge the permeability 10%, luminous efficiency also have a chance to increased by 20%, and transcend fluorescent, because incandescent lamp gradually into medical history and government subsidies to promote factors, LED lighting gradually from the past (the type used, for example, to reveal ark lamp, plant floodlight lamp, medical treatment, and began to walk into the commercial, household Lord lighting market.

Part of the value of kitchen led downlights industry development potential, 2010 have aggrandizement illume layout, and with the TV in the fourth quarter turn back lighting demand light, also make the proportion of LED lighting growth, it is estimated that 2010 years the proportion of crystal electric lighting will reach 2, 2011 is expected to grow to 3 into, and Thai valley in the fourth season high power lighting is hopefully increase the proportion of to nearly, the ladies in the fourth quarter is expected to round to the proportion of 3 into lighting.

But LED FengZhuangChang bibcock in 2010 though light lighting launched their own brands, but the main business is still lay particular stress on the backlight application, the proportion of lighting. Only about 5% ~ 6%, and although that 2011 m light lighting business have the opportunity to grow multiples, is expected to contribute $1.5 billion revenue, accounting for about 10% of overall revenue levels, but still belongs to the low proportion of lighting, compared with 2010 YuDongBei points out that LED lighting products revenue of about 1 billion to 1.1 billion yuan, the scale has surpassed light, on the mainland in 2011, Europe, the us and Japan market surge in order, 2011 LED lighting revenue is expected to reach 2 billion-2.5 billion yuan, and rising stars YiDiSen is specializing in high power LED lighting, maintain the 3 gross margin, potential development is after is good.

With the new competitors are joining the market, recent foreign legal person named light, etc FengZhuangChang possible future expansion in traditional strong customer base face difficulties, or even lose their industry’s leader, in addition because downstream encapsulation competition is intense, is expected to ship in 2011 average unit price decline could LED, gross margin and impact. LED companies have argued that the TV back lighting and lighting will be in the future growth of the twin-engine =, but TV back lighting is in the next two to three years later the bottleneck facing growth slowed sharply, and LED lighting will be pulled the continued growth of kinetic energy of important industry, now LED lighting is embryonic stage, the future industry still has a fierce competition, the anticipated market forces will face the shuffle.

: of jade brilliant photoelectricity? The road illumes solution of power of Zuo Umileds LED

12 Jun

Jade brilliant photoelectricity publishs the road illume that is based on LUXEON REBEL led strip lighting to apply solution China Shanghai in China – flying benefit riverside company of photoelectricity of Lumileds He Yujing (GSEO) announce today, GSEO is cooperating with LUXEON Rebel, development can use illume of new-style solid state and form of street lamp model on complete China road. The new-style street lamp of GSEO will be used in installation of the investment at the beginning of 2010. GSEO is the most advanced LED norms of street lamp (use LUXEONRebel Technology) dependability of more serious consideration, efficiency, easily compositive and medicinal powder heat energy force, these main essential factor make the solution of their solid state illume and conventional lighting photograph lower than cost and specific power consumption.

Through the choice one kind passes the reliable power of test and verify LED, innovation goes the engineers that invite GSEO a kind of such designs: Every are made of baked clay what the LED amount of 70 lumen, need decreases the least, effectively or eliminate a likelihood to cause a vision to disturb is dazzling strong light.

The company is used to obtain those who have patent to come loose hot design, can ensure the play of function of service life of LUXEON Rebel LED. In fact, its refrigeration system ensured the service life of this kind of product.

“The solution that GSEO is developing can think purchase brand-new road illuminative city brings enormous economic benefits, “Asia-Pacific area sells vice-president Alvin Tse to say. “We are expecting to be in what did not come to a certain number of in year, their design as will be able to is brought high quality, go Ke relies on road illume of the gender. Gulo Ke relies on road illume of the gender..

“The method that GSEO creates new solution is the flexible led strip lighting that chooses top quality, carry out the systematic design of optimization, in order to ensure new illume facility is the whole optimal solution in the light of its target application. “Calvin Chen of inspector general of the Department of LED illume career of GSEO says. “Its develop a quality namely as a result tall, life long, light distributings even street lamp. What GSEO wishes to be globally each district is municipal offer the illume solution that employs Philips LUXEON Rebel LED with the organization. What GSEO wishes to be globally each district is a municipal offer the illume solution that employs Philips LUXEON Rebel LED with the organization..

GSEO (Jade brilliant photoelectricity) limited company held water in 1990. Besides the street lamp, still devoting oneself to manage the sources of energy and the channel lamp that reduce carbon dioxide to discharge, floodlight and solution of illume of other solid state in development. GSEO is designed in mould and produce a respect to have rich experience, especially special skill is mixed at the design of a component of high accuracy optics, development make. Have these abilities to make GSEO can offer whole design and production flow solution for the client.

About Philips Lumileds

Philips Lumileds is a provider of the world’s banner LED Tube of illume solution High-power. The company always devotes oneself to to promote the development of solid state lighting engineering, raise the environmental protection sex of illume solution, the help reduces the demand that CO2 is discharged and reduces extend power plant, and the company’s lead illume output, effect and the immediate positive result that heat energy manages even if this respect works. The LUXEON LED of PhilipsLumileds was shopping, outdoors, office, school and domestic illume solution to offer a new alternative.

About Royal Philips Electronics

Holand Royal PhilipsElectronics (NYSE: PHG, AEX: PHI) be advocate ” health comfortable, the diverse company of ” of high grade life, devote oneself to to improve the life of people through rolling out innovation technology in time. Regard the whole world as the leader of Medical Protection, high grade life and illume domain, the thorough knowledge that Philips is based on pair of client demand and ” essence at the heart, brief the brand at form ” is affirmatory, blended in technology and design it is with the person this in the solution. Philips headquarters is located in Holand, in the whole world 60 many countries / the area is had to 116, 000 employee, the sale 2008 obtains the company 38 billion dollars. Philips is in heart custody, urgent nurse solution of Medical Protection, as energy-saving as the family illume and respect of new-style illume application, and in the light of the individual shave of the flat TV of comfortable and high grade life, male is needed and appearance product, portable recreation product and oral cavity nurse the domain such as the product all is on world banner standing.

The government push LED lighting consumption

11 Jun

In gangrenous a meeting of the 2012 Asia LED peak BBS “on, Japan lighting appliance industry is director of headquarters that has been set up with mud Canon said, to ease the tension after Japan electricity phenomenon, by the Japanese government to implement a number of measures to promote the 12v led light bars, make the LED lighting consumption growth above 200%, in addition, he called for international development of the LED test standard, make industry has more effective judgment standard.

Mud Canon introduces, in March of 2011 F island after the earthquake, many areas in eastern Japan have not restored to power. On May 5, 2012, the Japanese Hokkaido Electric power company poison nuclear power plant Unit 3 shut, so far the Japanese all operations of the nuclear power plants to shut all. After Japan, 30% of electric power depends on nuclear power, nuclear power units of closing, more fueled Japan’s power failures phenomenon. “So all over Japan appeared rotation of the power system, once road traffic lights were without electricity, and, even will cease. Mud Canon said.

Accordingly, the Japanese government began to introduce “ecological points” plan, and to establish and implement green purchase, appliances safety, etc. Among these policies, including the energy saving of lighting facilities to encourage policy, about using the flexible led strip area, according to its energy saving degree of different, further reduce the price. The plan is began in Japan before the earthquake, but its promotion of postwar Japan still for energy saving played an important role. In 2011 Japan LED lighting sales a 268% increase from the previous year, and 2012 will be expected to again on this foundation growth of 185%. Mud Canon refers to, the year, LED lighting products sales account for all the lighting products sales of around 20%, and the proportion is expected to reach 42% this year.

In order to further promote the use of high density led strip, mud Canon also put forward should formulate the LED lighting industry international standards. According to Japanese lighting appliance industry association on the market of Japan 12 LED lighting products contrast test, the same product in the use of the energy department LED performance standards and use Japanese light industry association LED performance testing, the largest gap can be close to 50%. “So popular in international test standard for become very necessary.” Mud Canon said.

Mud Canon thinks, new international standards should be to LED products light performance standards for specific parameters, such as flux, color temperature, service life etc, and to offer consumers understood instructions, and used in the difference between different kinds of LED products.

Lighting use LED products have to solve technical problems

8 Jun

Lighting in need of W white led strip products to power level realized industrialization, must solve technical problems are as follows:
(1) powder coating quantity control. LED chip + phosphor processing adopts the glue method, usually is mixed with glue and phosphor after the distributor on the chip. In the operating process, because of the carrier adhesive viscosity is dynamic parameters, greater than the carrier and the proportion of phosphor glue to produce precipitation and distributor precision the influence of factors, the process of phosphor coating quantity uniformity of the control has difficulty, led to the inhomogeneity of the white light color.
(2) chip photoelectric parameters between cooperation. The characteristics of the semiconductor technology, decided the same materials the same wafer chips may exist between optical parameters (such as the wavelength, the light intensity) and electrical parameters (such as the forward voltage) of the differences. RGB three colors chips are this, for the white light chromaticity parameters influence. This is the key to solve the industrialization must be one of the technologies.
(3) Color light controls parameters. Different USES of products, the color white Flexible LED Strip Lights to coordinate, color temperature, color rendering, light power (or light intensity) of light and space distribution and so different demand. The control of the above parameters involved in product structure and technology methods, materials and so on various factors. In the industrialized production, to the above factors control, application for compliance with requirements and the sex good product is very important.
White LED the purpose of the research is to achieve high efficiency, high power, the long life devices. The technical problems are: to lower the defect density, and improve the ohm contact and electric field uniformity and increase the rate, reduce the temperature rise out, etc. In the study of the major measures taken are: the lateral growth, matching substrates, packaging technology improvement, etc.
At present, in the substrate, chip technology and white LED chip extension of the device in such aspects as production technology has made great progress. In the sapphire, because it does not match the substrate, so take a lateral extension technology, and to make performance made bigger improvement. At present the research progress of chip result is:
(1) the substrate based on sapphire blue, green, violet and uv LED for best performance at present is to take lateral growth in technology based on made, purpose is to reduce the dislocation density, blue, violet device outside of quantum efficiency is about 40%, but the green, uv device is about 15%, respectively from the target is two to six times. Based on the chip in the white light of the improved performance depends on the phosphor and packaging technology improvement.
(2) in the silicon carbide because the device has more small dislocation density, based on the substrate of each color LED performance is still better than sapphire substrates of lateral growth LED performance, but because the substrate is your 7 to 10 times Sapphire, the performance optimization research work for relatively less.
(3) respectively with silicon carbide and alumina and GaN and sapphire as substrate do during the light contrast experiment shows that their ultraviolet light characteristics, the difference between the order of magnitude, with that of the substrate based on low defect density LED may get the best luminous property (including lumens efficiency and single pipe to generate data).
To realize efficient white LED lighting system of practical, semiconductor lighting the main contents include:
(1) study to use UV-LED AIN, GaN etc of the center for the semiconductor compound emitting mechanism.
(2) to improve blue, UV-LED the extension of growth technique.
(3) are the development of homogeneous extension board.
(4) the development of efficient RGB phosphors white high density led system and practical.
White LED lighting goal is the development direction of: in lighting colour temperature area, realize the specular highlights, high photosynthetic efficiency, high show color index and low cost and the uniform color white LED. In recent years, the industry began to adopt a large number of white LED alternative CCFL LCD back lighting and EL as the (background lighting abbreviation). Compared with CCFL, EL, white LED has the following advantages:
(1) can make more vivid color LCD, with white light of LED back lighting NTSC levels reached 130%, and CCFL is only 70%
(2) are the expansion of the levels that the LCD image more saturated, more vivid color; Can make the LCD thinner thickness, in 18 inches (1 inch = 2.54cm) LCD modules, white LED back lighting thickness for four to nm. CCFL is 8-l2mm.
(3) life is long, can reach 50000 h.
(4) The accord with environmental protection requirement, white LED contains no mercury.
(3) compared with EL lighting. White LED back lighting won’t produce interference.
Lighting source a basic requirement, is to adapt to the eyes of the people need, and the eyes of characteristics to match demand. Now there are two ways: one is through the blackbody radiation, 2 it is through the different colored light synthesis.
According to the principle of incandescent lamp made blackbody radiation, because the color temperature can’t too high, most of the energy into the infrared radiation, and make the luminous efficiency is reduced, different colored light synthesis BaiGuangYou different synthesis method, can be two, three or more kinds of colored light synthesis white light, the color kind of use, and it is the pixel high, but lower lumen efficiency, this and for the synthesis of white light the quality requirements of the relevant. Generally speaking, with RGB three colored light synthesis BaiGuangKe at the same time satisfy the luminous efficiency, show color index, color temperature requirements, etc. The theoretical analysis shows that if the color temperature for 6500 K, show color index greater than 90, only when the three colors respectively for 455 nm wavelength, 530 nm and 610 nm, white light lumens of synthesis of the highest efficiency, can reach 300 lm/W.

LED optoelectronic devices cold light source and the difference between the heat source

6 Jun

Cold light source: Cold light source is the use of chemical energy, electric power, stimulate the

light source of organisms (firefly, neon lights, LED, etc.). Has very good optics, become flash

characteristics, led strip lights. Objects shine, LED

optoelectronic components, its temperature is not better than the environment temperature is high,

the LED display, this kind of glowing call for cold light source, such as LED by the electronic

hole is to composite luminescence. Strictly speaking, LED two Aurora is electroluminescent also

have heat generation, it is relatively incandescent lamp etc for a low light source. LED light

conversion efficiency is about 30%, within about 70% of quantum efficiency (close to the

theoretical limit), and the quantum efficiency around 50%. (This is the experimental data, and is

not accurate value)
Hot Light source: use the LED Light

Barssource of heat stimulus, such as an incandescent lamp in the 3000-4000 K temperature

thermal radiation to shine. Incandescent lamp has 80-90% of energy conversion can heat energy,

about 10% of the energy conversion to light energy, lighting planning and design. So the luminous

efficiency is low. We are not according to the temperature of the shell lamps to define for cold

light source, or a heat source, LED lamp tunnel renovation. The lamps and lanterns of the

surrounding temperature, can judge the quality of heat lamps and measures.
Cold light and heat difference between light source, LED Fluorescent, we not only from the definition up

divisional. In fact we say the cold light and are not a process of light does not produce heat, but

that is not the way by heat energy light conversion to light energy. Incandescent lamp is typical

electrical energy into heat energy by, then heat energy into light energy of the process, Beijing

LED tunnel light. Heat loss is higher. The luminous efficiency low, at current led the white light

of the development trend of cold light source the light source alternative hot era has to not far

away. So we can put the LED as a cold light source.

LED flash drive circuit design

5 Jun

On the market to increase each year, are hundreds of phone, the basic function of these cell phones are all the same, that is communication. The design is to increase mobile phone around mobile phone additional function, increase selling point and mobile phone RunDian inti the main way. The main difference between different mobile phone lives in peripheral functions, such as appearance, color screen brightness, multimedia function.

Now the market led strip lighting controller are integrated in the control circuit and boost switch tube, but inductor and used in the free-wheeling scuttle diodes or external, this increases the complexity of the circuit, cost and PCB area. In addition, because flash flooding power circuit, LED, display screen, mobile phone in the general mobile phone, and the phone of the circuit get close, so effectively prevent driving circuit the inductance of the EMI interference is also a very important question.

Charge pump adopts the capacitance for energy storage components, the charge pump don’t need external inductance, so that there is no problem of electromagnetic interference. In addition, the solution of the area of the PCB is small, but the relatively low efficiency. Because flash working time is very short, duration general for 100 ~ 300 ms, so for the battery life of the efficiency of the effect is not too big.

LED flash drive circuit design

Sioux company based on the charge pump working mode flash

Sioux flash drive series of products to the peripheral circuit is very simple, just need three capacitance two resistance, which Rsense and RSET to set the flash mode and ChangLiang mode LED current.

1. The SP6685 ChangLiang Mode:

SP6685 for constant flow type drive chip, in ChangLiang mode of 50 feet FB tube voltage Mv (typical values), this current on the LED to:

ILED = 50 mV/Rsense

Need to point out is, because FB voltage of 50 mA, so even if through the carrying 200 mA current, Rsense consumption of power for:

Rsense = 50 mV200mA = 0.01 W

This shows, with only 0603 package SMD resistor can meet the requirements. But in the constant pressure output work mode driver a circuit, the current limit resistance must select bigger encapsulation. The LED the forward voltage is commonly 3 V 4 V when the output voltage of 5 V, add in the current limit that the voltage across to 1 V 2 V, assuming that flash current 200 mA, the SFCL power consumption for:

PR = UI = (1 V ∽ 2 V) 0.2 A = 0.2 W ∽ 0.4 W

Then must use four 1206 package SMD resistor. Using a 0603 compared SP6685 resistance. The PCB area increases greatly.

With the constant pressure of the output charge pump, compared with SP6685 efficiency advantages.

The charge pump efficiency η depends on the input voltage VinLED positive voltage Vf and boost multiples K (1 X, 1.5 X, 2 X), the equations for:

?? = Vf / (Vink)

Because mobile phone batteries work range 3.6 V 4.2 V, when the output voltage of 5 V, charge pump must work in the booster mode, namely K must for or 2. And in fact, when the input voltage is higher than the forward voltage Vf certain LED amplitude, the charge pump can work at 1 X mode, then the power will be considerably more than the 1.5 X and 2 X model of efficiency.

2. SP6685 flash mode:

SP6685 flash mode voltage from RSET FB decision, computation formula is as follows:

VFB = (1.26 VRSET) 11.2 k Ω

Among them, the 1.26 V is chip internal reference voltage, current limit in the internal resistance. So, the LED on the current for:

ILED = VFB/Rsense

Because the current is not LED Tube by RSET, so almost no power consumption, can choose 0603 or 0402 chip resistors. In the flash drive circuit scheme, need only two chip resistors and three 0805 chip resistors, the PCB area is 5.43mm, with the minimum volume.

Comprehensive mentioned, the flash drive Sipex company series products have many advantages, including: the current control mode, can accurately control LED current on the and brightness; Peripheral devices at least, the minimum needed for packaging; Switch the highest frequency, can choose smaller net value filter capacitance and charge pump capacitor;

Don’t need inductance, won’t produce EMI interference problems; Can work at 1 X mode and low voltage feedback to 50 mV, so SP7685/6685/6686 of the efficiency in the use of charge pump mode for the chip supreme; SP7685 built-in Timeout function, in flash mode after 2.5 seconds automatic shutdown, thus protecting LED, flexible led strip lighting to avoid overheating; Provide the maximum driving current ($1.2 A), and 700 mA, 400 mA different levels of drive chip for choice.

Look from the market demand of LED lighting circuit design

4 Jun

Although the potential value of mini led light bars after, industry also LED chips in input in many heart, but is circuit design is concerned, it is still drive LED light source important role, even if chip and packaging for better, circuit design is not in vain, summarized to see, LED lighting circuit design is still not to take off a volume, cost of several basic points, but also is the important reference PFC indexes.
From the whole LED lighting system of to observe, LED chips and assembly field accounts for the overall cost quite high proportion, however, although the proportion of circuit design is not high, but, after all, is the relationship between the carbon save energy demand, how in power consumption can reduce power consumption on the system operators must become thinking subject, but on the other hand, the LED illumination also faces to the cost, service life and volume, and many other design requirements, at the same time are facing many requirements of the situation, the system operators will also pressure on to the semiconductor industry, also let semiconductor company in solutions also faced some provide challenge. Asian beauty semiconductor operations and consumer product marketing manager LinZhiYan career group of technology that he himself observation, lighting operator for circuit design is quite strange, this kind of problem, usually are passed on to the semiconductor industry to think of a way to solve, and lighting industry can spend more heart in institutions, optical, heat dissipation and appearance design, with twice effect.

Further points out that, because the lighting operator for circuit design is quite strange, but in order to match the exterior or institutions design requirements, the semiconductor industry to stand in the Angle of with as much as possible to help customers solve all the problems, and needs rapid mass production, in the development of the circuit board design, also as far as possible to the “immediate shipment” as the goal, as far as possible in the shortest time into the flow of the shipment.

Use different circuit design concept also vary slightly

The application field of high watt led lights in general can be divided into indoor and outdoor and vehicle lighting type etc, although these three fields can still subdivision quite a number of categories, but to view, circuit design and without too much difference, and the differences are more, mostly during the operation temperature, system volume, reliability and cost, and other factors. For example, indoor lighting applications, such as household or commercial field, will more attention to cost and system volume problem, if outdoor lighting, may be less need to consider the cost, but in homework temperature and reliability, etc, it’s relatively more important. As for automotive lighting, although no AC-DC component help, but after all the personal safety and high association, in the reliability and life on the also will be especially requirements.

Indoor and outdoor different demand

Outdoor and indoor lighting in the operation environment is more tough, supply the level of large companies fall, and the current stage of the outdoor lighting is also a more explicit standard, the expected future outdoor lighting to further growth market, still needs a period of time. But despite the external environment don’t talk about, in fact, outdoor lighting power demand is higher, the main reason is that LED lamp is more, after in series, power will also increased in parallel manner if, upon meeting conduction voltage problem, so if you are going to outdoor lighting development, the solution must relatively complete, can meet the design requirements.

Indoor and outdoor lighting will need AC, DC component, to the transformation of the AC/DC electricity, but still need the help of DC-DC to lit LED light source, although two types of components are important, but the former must carry up to 110 V or 220 V of high voltage, into the threshold for relatively not easily, the latter into low threshold, competition is more intense.

IR (international rectifier Company) LED are the department manager Peter Green says, indoor and outdoor LED lighting will choose offline circuit, and depends on the size and power of general application safety requirements. In the low power applications, not in need not use isolation antihypertensive converter, just need to separate but the return chi type converter. External devices may need more isolated, because they must be able to moisture proof, to prevent the risk of electric shock.

In the larger LED Fluorescent Replacement appliances, such as street lighting, the general power more than 50 W, related isolation type design will likely adopt a front end and back end level including the level 2 power structure. The front end level will provide power factor correction, and then the isolation and adjust level will provide current to drive LED load.

On the electric circuit design, outdoor and indoor lighting and not have too big differences, the main difference is in operation temperature, is about to 85 degrees Celsius to around 105 degrees, but if Japan region, may be as high as 125 degrees level, visible to the temperature outdoor work demand, the gateway is quite high. Outdoor lighting in addition to the special requirements of operation temperature, in safety hardly can compare with industry level, both in the reliability, product life or prevent thunder eager, etc, they are all needed to be considered outdoor lighting place.

Automotive lighting requirements has security is still a top priority
As for the automotive lighting, also can have temperature requirements, and the national semiconductor (NS) Asia Pacific senior market ChenGuangJi said engineers, automotive lighting without the use of AC (AC), is directly used 12 V DC (DC), circuit design relatively easy, but the rule of automotive lighting temperature requirements for roughly around 105 degrees Celsius, and the change of the temperature will influence the stability of power supply, moreover, the application of the environment is to belong to automotive field, also want to consider to safety, reliability, service life and stability and related requirements, so the difficulty of the circuit design is not less than other application fields.

Peter Green also added that the points out. LED by low drive car use DC power, the application in the tail light, in the front, and display a backlight is between respectively. Part of the application for, low current LED to use simple linear adjustment is enough. In other cases, such as in power relatively high headlights applications, you need a switch mode power supply, and can use several potential circuit topology, including booster, step-down-or step SEPIC. This LED drive needs to withstand car of possible high surge voltage.

PFC different requirements but direction to the agreement

Be worth what carry is, because (power factor correction) PFC also become LED lighting is one of the means reference values, the higher the value PFC, will let the circuit design more and more complicated, also in virtually increase costs, but this practice, also can sacrifice system area, this to home and commercial lighting lighting system has a high design difficulty, especially in Japan, PFC numerical requirement also has been on the rise, and this will allow semiconductor industry wits.

NXP semiconductors (NXP) the greater China area lighting products marketing senior managers ChenRong thinks, different countries formulate policies and regulations of each have differences, like a Japanese policy running time is earlier, whether T5, T8 started to import in LED light source, and at the same time will be LED lighting and intelligent or radio frequency, and other functions, in order to improve the LED illumination additional value, but also because of this, plus the Japanese have long been holds the key to all LED patent, if foreign companies to enter Japan semiconductor market, it will inevitably face compatibility problems, this is not all a line of semiconductor industry can do.

Chechen also further points out, recently in South Korea LED lighting, also have quite a few describes, in the standards set forth on PFC must also up to 0.9 above, the move, but also increased into the threshold, but because of the Asian region LED lighting development condition, mostly by government to lead, the improvement of PFC value, means that the circuit will also increase the cost, overall development, it is not very good, the future the government’s attitude is still Asia LED lighting of the development of the market observation indexes.

On from the application perspective, PFC LED lighting is indeed one of the focal points of circuit design, power perspective, 15 tile the following lighting applications need high value whether PFC, even can need not into consideration, this still depends on the needs of customers, but her understanding, even if it is 3 to 5 watts of industrial lighting, have begun to have the requirement of PFC, and its numerical requirements as high as 0.9 or so.

This shows, LED lighting circuit design, although the proportion of the whole system in cost is not high, but with the challenge of the ascension of no less LED the luminous efficiency, although different applications, and considering the design conditions also different, but can know is, the existence of PFC, has LED lighting is indispensable to the future of the elements of the circuit design.