The Lele-LED Lighting Application Technology Seminar hosted by Gaogong LED was held on December 18, 2010 in Qingqing World. This is another professional technical lecture after the "LED Frontier Technology Theme Reporting Conference" and "High-tech LED Paper Contest and Engineer Paper Reporting Conference" on the 17th. At the meeting, the speakers had a heated discussion with the participating engineers on issues such as product development design, measurement, reliability and adaptability, and drive power.
LED lighting application technology lecture site
Wang Shiming: How to improve the reliability of LED products and control systems
How to improve the reliability of LED products and control systems? Wang Shiming, general manager of Lelei Optoelectronics Manufacturing Department believes that high-reliability products (system engineering) should be built to create a win-win thinking for government units, product manufacturers, lighting design consultants and professional dealers. . Patent does not equal technology, does not equal market, does not equal profit, does not equal profit, does not equal cash, only good product / system + good lighting design + good professional dealer + good system installation and debugging = high reliability products / System Engineering = "Cash".
Mr. Wang said that from Q4 of 2007 to Q3 of 2010, the average annual failure rate of 21 major LED projects of Lelei was 0.98%, and the average annual reliability was 99.2%. How did such high reliability come from? He introduced the lighting project of the Zhujiang River along the Guangzhou Asian Games, the lighting project of the Shanghai World Expo, the main venue of the World Buddhist Forum, the lighting project of the main venue of the Beijing Flower Expo, etc. Large government projects shared with participants the experience of mastering the high reliability of products.
Chen Bin: How to develop LED application products
Chen Bin, general manager of Zhonglong Transportation Technology, believes that the main idea of ​​leading LED application product development is that a good development method is the basis for developing a good product. Product development should follow the development flow chart of demand analysis, demand design, product design, product testing, which involves four parts: application requirements, application methods, application conditions, and application characteristics.
Taking the tunnel light as an example, the application requirements need to consider that the tunnel lighting only requires illumination of the area below 2M of the road surface and the wall, the protection grade IP65, the anti-glare device suitable for the characteristics of the road tunnel, the adjustment of the installation angle, the easy replacement of the accessories, and the total brightness The minimum level of uniformity requirement is >0.4, and the minimum level of uniformity of longitudinal brightness is required to be >0.5. The application method considers tunnel lighting as 24-hour uninterrupted lighting, which is divided into daytime lighting and nighttime lighting. Segmented lighting is used during the day, which is mainly divided into four parts: entrance section, transition section, middle section and exit section. The basic lighting is maintained in the tunnel. The application conditions consider that the installation height of the tunnel light is 5-6 meters, the installation spacing is less than 12 meters, the stroboscopic problem of the arrangement of the lamps should be taken into consideration, the automobile exhaust gas in the tunnel is seriously polluted, the one-way driving of the vehicle and the jet fan in the tunnel are easy to form a piston. wind. The application characteristics consider factors such as high requirements for lighting indicators, poor grid environment in some areas, difficulties in maintenance after tunnel opening, and difficulties in later maintenance.
Chen Xu: LED road lighting design difficulties - environmental adaptability and reliability
Chen Xu, general manager of Jiangsu Xinli Optoelectronics, introduced the current situation of environmental adaptability and reliability of LED lighting application industry. As far as the current situation is concerned, lighting applications still exist: unstable light source, short life span, difficulty in light distribution, and flare Waiting for difficulties.
By comparing the design of LED street lighting products with all-metal embedded, thin substrate and single crystal packaging technology from four aspects of packaging process, light efficiency, thermal conduction and illumination distance, it is found that the metal packaged light source module has good heat dissipation performance and light distribution. Excellent, high luminous efficiency, it allows customers to reduce hardware investment costs, reduce production labor costs, and reduce investment risk costs.
Pan Jiangen: Problems in LED luminaire measurement and new trends in measurement technology
Professor Pan Jiangen, Chairman of Yuanfang Optoelectronics, said that according to the US CALiPER Summary Report, there is a big deviation between the manufacturing trademark and the actual measured value. What factors should be considered in the measurement of LED lamps? Prof. Pan introduced the measurement methods of CIE R2-42 LED lamps from the aspects of measurement conditions, ignition attitude and luminous flux.
In addition, Prof. Pan introduced new trends in measurement technology such as LED product quality core testing, different LED test applications, and new LED lighting for photometry, colorimetry, and light-to-human relationships.
For LED product quality core testing, consideration should be given to brightness distribution measurement, near-field luminosity and colorimetric measurement, two-dimensional spectral luminosity and two-dimensional color measurement, temperature characteristics and durability testing, LED product standard lamp key technology and other factors; different LED test Applications should consider semiconductor lighting field test, semiconductor lighting transient characteristics online test; LED new lighting for photometry, colorimetry, light and human relations, should consider intermediate visual effects, color rendering, etc., photobiosafety Wait.
Wang Xitian: Technical analysis and industrial application of AC LED lights
South Korea's Seoul Semiconductor Co., Ltd. announced in 2010 that it invented and mass-produced "AC LED lights", which caused concern in the Chinese LED industry. Professor Wang Xitian of Guangxi University believes that the exchange of LED lights is a major breakthrough in the concept of traditional DC LED lamps. China can start research and development of AC LED lights and form China's independent intellectual property rights, and establish mass production and market competitiveness. Exchange LED lighting industry.
However, the difficulty of AC LED lamp technology - the problem of flicker needs to be solved. Professor Wang believes that it is possible to use rare earth lanthanum elements to enhance the afterglow of phosphors for more than ten milliseconds. With this formula of phosphor powder, "Rare Earth Long Afterglow LED Special Phosphors" specially adapted to AC LED lamps can be produced, which can eliminate the troubled communication. The "flickering" problem of the development of LED lights.
In addition, the "waveform phase shifting cover" technology can be used to make the visual perception of the flashing of the AC LED light, that is, two-phase or three-phase alternating current with zero crossings at different time periods, to illuminate two or three independent AC LED lights. Integrating these LED lights in the same luminaire not only retains the advantages of high efficiency of AC LED power, but also eliminates the zero-crossing of the light due to the "waveform phase shifting" technology.
Xu Liancheng: Thinking and exploration of LED lamp structure and design
LED expert Xu Liancheng said that all street lamp products on the market are currently designed without any features. He suggested that design engineers should develop industrialized and artistic products in combination with regional culture. In addition, the current street lamp design also has material surface treatment (including power supply), which is difficult to withstand the erosion of long-term harsh environment; the rectangular shape does not meet the requirements of wind resistance; the high power concentrates on the whole heat sink material, which is easy to cause heat island effect; The overall design brings difficulties in post-maintenance; the sharp and angular heat-dissipating blocks do not meet the requirements of the safety standards of the lamps.
He believes that for the first and second problems, a streamlined upper cover can be added to the luminaire. The streamlined upper cover should not have a large area of ​​the plane, and it is preferable to have a middle height and a low circumference. Of course, the cover should have a well-designed heat dissipation hole and a flow guiding surface. For the third and fourth questions, it is recommended to “turn the luminaire into zero†and abandon the monolithic design and change to a modular design. For the fifth question, it is recommended that the luminaire design engineer should consider the operator's point of view and pay attention to the details in the design.
Yan Chongguang: New high efficiency LED universal lighting driver solution
Yan Jing, Director of Shanghai Jingfeng Mingyuan Semiconductor Market, introduced LED constant current source low voltage and high current driver chip and typical application, LED constant current source non-isolated driver chip and typical application, LED constant current source isolation driver chip and typical application, LED lamp SCR dimming solution, LED fluorescent lamp driving power solution, LED lighting system application program, and national PFC or THD requirements for LED drivers.
He believes that the high-power light source heat dissipation design is the key: there is a certain space around the light source, so that the air circulation helps the light source copper-aluminum substrate to dissipate heat; the aluminum-based PCB board with excellent thermal conductivity is used instead of the glass fiber PCB board with poor heat transfer; The design of the radiator should conform to the aerodynamic principle, so that the heat source air can flow to the automatic cold end space, and the convection airflow can be automatically formed to rapidly dissipate heat without external force.
Jiang Dapeng: Design Points for LED Drivers
Jiang Dapeng, senior engineer of Infineon Electronics, believes that the design of LED driver power should first distinguish the two concepts of life and failure time. Lifetime refers to the time before a single product works normally. The failure time refers to the maximum time from the start of the hard disk to the failure. Through the analysis of the failure of the LED lighting device, it is found that the failure rate of the LED chip is less than 5%, the LED driving failure rate is more than 90%, and the failure rate of other elements is less than 5%. Therefore, to improve the life of the LED, you should choose a capacitor with high quality and long life, reduce the fluctuating current of the capacitor output power, and let the working voltage return to its rated value.
In the future, LED driver power will be applied to wireless dimming, power line communication dimming, 0-10V dimming, phase cutoff dimming, new generation 3-wire dimming, and new generation block diagram dimming.
Touch sensitive sensor has humanized design. The switch can automatically disconnect when electricity breaks and it will be in the OFF station when electricity comes back. Touch control ensures longer service life than mechanical switch. New imported IC processor for nice sensitivity and stable performance.
Description of Touch Sensitive Sensor
Item: Touch Sensitive Sensor
Size: 12mm*19.5mm
Voltage: 3V
Function: on/off, dimming
Standby Power: ＜0.1W
MOQ: 1000pcs
FAQ:
Q1. Can I have a sample order for led light?
A: Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.
Q2. What about the lead time?
A:Sample needs 3-5 days, mass production time needs 1-2 weeks for order quantity more than 1000pcs
Q3. Do you have any MOQ limit for led light order?
A: Low MOQ, 1pc for sample checking is available
Q4. How do you ship the goods and how long does it take to arrive?
A: We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping also optional.
Touch Sensitive Sensor
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Shenzhen Jedver Smart Lighting Co., Ltd. , http://www.jederwell.com