Blade – 第758页 – LED Lighting Blog

Multiple choices for LED household protection circuit

We can choose to use transient voltage suppression diode (referred to as LED household protection circuit). Transient voltage suppression diode is a diode in the form of high-performance protection device. When its poles by the reverse transient high-energy impact, the negative 12 power of 10 seconds of a very short time speed, so that between the poles of the high impedance immediately reduced to the low resistance to absorb up to several kilowatts power surge between the poles of the voltage clamp at a predetermined voltage value, the effective protection of the precision components in LED household protection circuit. Transient voltage suppression diode has the advantages of fast response time, the transient power, low leakage current, breakdown voltage deviation of consistency, the clamping voltage is easier to control without damage to the limit of small size.

But in actual use is not very satisfactory. The first is to find very easy to meet the requirements of the voltage value of the TVS device. TVS devices are mainly u LED household protection circuit and led high bay lights of the supply voltage is 24V or 12V, this voltage for normal LED lighting products is rarely finished, the test is not good. At the same time, we know: the LED light bead damage is caused because the current ambassador chip internal overheating. LED household protection circuit can only detect over-voltage can not detect over-current. Overvoltage, over current, but to select the appropriate voltage protection point difficult to grasp, this device will not be able to produce it is difficult to use in practice.

Hangzhou Lantern Festival: outdoor led landscape lighting show extraordinary talents

Hangzhou Arts and Crafts master teacher Cheng Di Shen, a wonderful beginning of the story, tell us a lot about the history of the Lantern.

The annual Lantern Festival, we have the lantern to see everyone knows, the illuminations from the Western Han Dynasty, there, dating back 2000 years of history. Real lanterns from the Emperor Ling of Han to the Tang Dynasty more lively.

Hangzhou Lantern reportedly originated in the Qin Dynasty. According to legend, in the Western Han Dynasty, the first in Hangzhou will be New Year’s “Tenth Five” called the Lantern Festival, Hangzhou people in this day and all lighting, which is the Lantern Festival known as the “Festival of Lights” or “Lantern Festival” reason. According to historical records, the Southern Song Dynasty Lantern Festival night, the the Kyoto Lin’an (Hangzhou) days of Street north and south, Phoenix mountain, and everyone lights, colored illuminations bucket Yan Zhenghui, stretching dozens of years without a break. Outdoor led landscape lighting put the lights, this time in Hangzhou, developed to its peak, bar lights, game lamps, lanterns become a common practice. At that time, the lights of Beijing tribute goods, white jade light, Fuzhou, Anhui the Xin’an glass lamp Jiangsu Nanjing folder Shadeng, the Changzhou material filament lamp, Suzhou Lo Kam lamps, Hangzhou sheepskin lamps and Kip Stone eye Lo lamps, etc..

Cheng teacher gave us a show he produced a outdoor led landscape lighting revolving door. A revolving door of points inside and outside of two parts, which have a light bulb, it will turn is the principle of the use of air heating, hot led high bay lights. Containing scientific and technological principles of the old lantern, magic bar.

Later, we learn to follow the process teacher lantern. See the light of the watermelon I do good?

How to improve the industry of led picture lighting

Although market expectations are so high, but at this stage, due to the blind development of led picture lighting industry in China has exposed the lack of core technology, lack of innovative capacity, such as disorderly market competition.

“The world’s largest lighting manufacturer Philips has predicted that 90% of the 10 years of production lighting LEDs, where opportunities are huge growing market demand will drive rapid advances in technology, but the state support the led picture lighting will the lighting industry icing on the cake. As technology continues to improve, LED production costs decreased by 30% a year. The industry believes that the total phase-out of incandescent lamp not more than 10 years.

For the healthy and orderly development of the LED lighting industry, many experts recommend, to strengthen national overall led picture lighting industry of the local planning guidance, as soon as possible enforceable national industry standards, especially related products in the industry standard in the demonstration project, such as street lamps, tunnel lights, display, landscape lights, so that local government procurement and enterprise products are criteria to guide.

Many experts believe that the market becoming more competitive, strengthen the next generation of semiconductor lighting technology research and development work without delay. At the same time, the early realization of the localization of the core equipment of led high bay semiconductor lighting, high-end equipment to fundamentally change the situation in person, and to promote rapid, healthy and sustainable development of the emerging strategic industries of the Chinese semiconductor lighting. As soon as possible supporting policies to strengthen the establishment and specification of the testing organization, to avoid some do not meet the actual test results, and improve the overall level of detection and credibility.

The tachycardia for led road lighting

Output value is the current led road lighting in the domestic lighting market penetration of only 5%, core technologies rely on imports, and higher overall cost to become a stumbling block to hinder the further development of LED industry. “LED Engineering Research Institute, Dr. Xiao-Fei Zhang said.

LED chip is like a car engine. The lack of core technology will directly restricts the development of this industry. “Zhuang Shenan said. It is understood that the led road lighting upstream chip production technology lies in the hands of foreign companies, the slower the process of domestic technology, affecting the development of the industry. MOCVD epitaxial furnace and its related technology is the most high-end of the LED industry chain mainly dependent on imports, greatly restricted the cost control of the LED industry upstream.

“The overall level, the gap between China and the international first-class level, there is still about two years.” Feng-Yi Jiang believes that “in many developed and developing countries or regions in the world in accelerating the development of the semiconductor lighting technology and industry, technology , China in the second echelon.

Blind investment and lack of core technology makes led high bay lighting market in China was mixed, good and bad. Unstable quality is also a LED enterprises generally faced with a problem. “Some customers a higher price to go back to the LED lights, and even thousands of hours not last, and even the quality is not as good as traditional lighting led road lighting market, there are many small and medium enterprises for the production of low-quality products, the industry pattern of instability.” Zhuang Shenan said.

Spring for led yard lighting

While led yard lighting industry to usher in the spring tide like the rapid development of, a lot of controversy on its overheated investment emerged. Some even thought that in the domestic market has not really started, the fanaticism development will overextend the future production capacity and market. Is the prospect of unlimited or difficult, the led yard lighting industry in China is exactly What are the opportunities and challenges.

LED lighting industry overheated investment

Currently, China has semiconductor led yard lighting included in the medium-and long-term technology development plan, has now formed a production of epitaxial wafers, chip preparation, packaging integrated industrial chain of LED applications. Good policy, the domestic LED industry, the rapid development of a potential blowout.

Nanchang University Vice President Feng-Yi Jiang, since last year, the led yard lighting industry began to trot to the development of the situation from upstream to downstream, in the first half of the year blowout state. According to statistics, in 2009, China’s led high bay industry, the upstream firm has nearly 60, the middle reaches of the device packaging companies have more than 1,000, more than 2,000 enterprises of downstream applications, employed more than 80 million people. Middle and lower reaches of the semiconductor lighting industry output value of 82.7 billion yuan in 2009.

Spring frenzy of investment in LED lighting industry exposure defects

The report shows that now, led yard lighting has gone beyond the backlight LED market, the fastest growing application market. By 2015, the LED output value of penetration in the domestic lighting market will reach 1/4.

A solo show for solar powered led street lights

To commemorate the 100th anniversary of the revolution held the first of sun yat-sen cultural festival opening ceremony, the use of modern technology and Chinese traditional culture the idea of combining, in zhongshan toki jiang square in creating a piece of the solar powered led street lights carrier “China zhongshan” print.

democracy and prosperity. This revolution over China about two thousand years autocratic monarchy, is a great revolutionary movement. The revolution in modern China is more fully in the sense of bourgeois-democratic revolution. Is it political, ideological brought to the Chinese people do not underestimate the liberation of the role. The concept of democratic republican revolution makes thorough popular feeling. The anti-imperialist and anti-feudal struggle to the revolution as the new starting point, deeper, more large-scale carried out.

“China zhongshan” seal of the creation, planning, design, to the realization of the whole application scheme is epic proportions, achieve a breakthrough solar powered led street lights application. “China zhongshan” four characters to ZhuanTi text outlined a traditional Chinese seal, text height up to 16 meters, the whole plane with arc arc length 54 m. Novel architectural design and automatic control and the perfect combination of mechanical structure, the present technology embodies in solar powered led street lights screen, through the automatic control and the combination of mechanical design, display with folding fan in the day to be automatic contraction principle, night can be spread, and eventually embodies the Chinese traditional art of lettering of the time-Yin and Yang. Designers tried to used led high bay to replace solar powered led street lights but finally failed. Otherwise, led high bay light also can be treated as a substitute.

Led lighting panels: show a “Star” style

The Dayun center has the world’s largest LED landscape lighting systems (Led lighting panels), the system uses a specially developed one million dedicated LED chip and nonlinear lens, the use of the six core patented technology of the world’s leading independent control system, you can synchronizecontrol of the 23880 sets the smart lighting, a total of 88350 independent control unit, 365 days a year Fully automatic operation and monitoring. All lamps are installed in the steel structure part of the main beam and sub beams, lighting and trunking hidden completely eliminates the Led lighting panels light, lights up when you see the light but not light, form a perfect and pure world of light and shadow. In order to achieve a unique crystal stone effect, the design of the Dayun center lights the main color to yellow, green, blue, white, and designed more than 20 different light distribution, however this is just the tip of the iceberg, the the Dayun center lighting system with light program, the theoretical upper limit is 4.2 billion kinds.

The use of a number of high-tech Shenzhen Universiade opening ceremony is also a spectacle. Such as the unique design of the door to the world, covering an area of nearly 3,000 square meters, consists of 365 LEDs. Laser projection line screen imaging technology will also be used at the opening ceremony. Can open and close the door to the world is a huge led high bay wall and a width of 110 meters, about 26 meters high, during the opening ceremony will be here to play to performing a variety of images, also designed above the 365 spaces, actors performances on the inside.

How to protect the LED household lights

We first thought was the protection of the LED fuse, the fuse is a one-time, and the reaction speed is too slow, not only the poor actually use a lot of trouble, so the fuse is not appropriate for the finished products of LED household lights are now mainly in the glory of the city engineering and lighting engineering. Actual demand, we have done a lot of experiments, and in accordance with the requirements of the project summed up to have the characteristics of the LED protection circuit, it is very demanding: can start immediately to protect beyond the normal use of current, so that the LED supply pathway was disconnected, the led high bay supplier and power supply can be protected, normal and then throughout the lamp can automatically restore power supply does not affect the LED, the key is because it is a civilian products, added circuit cannot be too complex volume cannot be too large, low cost. These requirements are contradictory, mutually conditioned, it was very difficult to implement.

These reasons will cause the LED current rise abruptly, and soon the LED chips will be burned due to overheating. According to our experience, the majority of the LED burned poles short-circuit, a small part is open circuit. Each LED is about the pressure drop of about 3.2V, and burnt it if the circuit LED strings do not shined. If this short-circuit voltage were transferred to other LED, resulting in greater current of the other LED household lights and other LED will be faster burned, and even critical power. Was little damage on the very easy to cause a big accident. The LED is usually installed in high places, the installation is not easy, even harder to repair. LED household lights protection is the actual demand, but there is not attention, is a lot of frustration there is no way to deal with the problem.

The radiation of led emergency downlight is out of the limits of standard

Recently, there have been media reports, the market almost all the led emergency downlight at close range of electromagnetic radiation in excess of the relevant provisions of the state on the electromagnetic radiation protection, which led to the concerns of consumers.

Before the same period a burst seen in the media, led emergency downlight radiation, but our home, these table lamps, bedside lamps, lighting lamps “I use are energy-saving lamps. If the true radiation, long-term brachytherapy will have a lot of harm. I wanted to ask you Is there any way to reduce or as much as possible to avoid the damaging effects of such radiation?

A Shanghai TV station recently reported that from the regular channels, they purchased 10 different brands of led high bay lights, to led emergency downlight benefits and the physical and chemical environment, Chinese Academy of Sciences, Yao Yu, Director of the Center invited the senior engineer of the Ministry of Environmental Protection Radiation Environmental Monitoring Technology Center, the use of professional equipment to detect the results show: all brands of energy saving lamps in the range of 10 cm, the electromagnetic radiation values are all more than 200 volts per meter, including a electromagnetic radiation is as high as 1600 volts per m. Existing national electromagnetic radiation protection, public safety exposure value be less than 40 volts per meter, which means that all led emergency downlight to be detected at close range radiation values are seriously overweight. Ministry of Environmental Protection Radiation Environmental Monitoring Technology Center senior engineer beneficial to the Yuan

Tianjin: How to find the balance point between the main LED lighting and the high price

Tianjin Haiyu lighting person in charge said: Overall, main LED lighting industry has an advantage, and the prices it is still not enough on its increasingly high demand, customers not only value is the energy saving effect, but the price is also attached considerable importance their principles out the least money, buy the most affordable energy-efficient products, but this is often in conflict. For example: the same two LED manufacturers A and B, Company A imported chips, CREE or Philips warranty for three years.

The face of the current market, in order to truly enter the market for main LED lights manufacturers to enter the well-known brands in addition to those well-known and excellent brand, like the well-known brands that come into the market turns out to be not an easy thing . Production of low-end products, for fear of affecting their reputation, the production of high-end products and competition, but Company B, a dilemma. However, LED manufacturers A still has right to produce their led high bay lighting products without any worry about the high price and competitions from other LED manufacturers.

Manufacturers should be how to face, I think the main high-end products, because the era of progress, common sense will grow, they will eventually understand and accept the high price of high-end products. For the manufacturer, the product knowledge to be a popularization, there is the sales staff to strengthen the training of professional knowledge and communication skills improved, so that they can very smooth very confident to communicate with customers, do not have our products in your the general idea. “

LED Lighting Blog

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作者：Blade