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Wei Peng century Analysis of LED driver power supply design applications with high quality LED lighting

sourcehttp://www.weleddianyuan.com/news/hangye-news/yingyongvspingzhi1025.html

time2013/01/10

In human long development process for night lighting, we have experienced before lighting the torches lit kerosene soaked experienced ancient lanterns, candles, kerosene, etc. do without energy lighting tools, the development of electrical energy to modern times incandescentlighting, into 10 years of rapid development, the upgrading of the lighting of LED energy saving and environmental protection, led lighting practitioners innovative manufacturing technology in the rapid development of a lighting era update speed and high quality LED lighting is also inseparableand manufacturing design theme: LED driver power supply design applications with high quality led lighting association and development between the following from the entire ecosystem for sharing and exchanging industry to develop healthily, to create more high-quality LED lightinglamps.

LED lighting has many advantages and features, the past 5-10 years, countries all over the world are given to this industry many economic support and policy support to be healthy and rapid development of LED lighting industry, led lighting have forward: energy saving, long life time, high lighting photoelectric effect, and also have a seismic effect on the features, and LED lighting life even up to 100,000 hours, but the development of anything from the maximum unlimited theory and the factors led to the theory and practice seriously upside down, such as LED guardrail tube or LED panel lights design process, because of the design for LED driver is not enough awareness of the power, and also forced by the boss of the factory cost control, final result produce LED guardrail tube, LED fluorescent tube actual service life of the LED panel lights greatly reduced, even 10,000 hours of life to reach even 5,000 hours of life is a question mark, the final result is reduced to the low-end products, to discredit the industry, corporate development does not go the final characteristics do not fully reflect the advantages of LED lamps.

        
LED lighting production manufacturing process reasons, lead to different LED lighting manufacturers even with an LED lighting manufacturer in the same batch of products produced by the LED lighting current voltage characteristics have large individual differences. Now as a reference to the high-power 1W white LED lighting typical specifications, do a simple analysis based on LED current, voltage variation, general 1W white light applications forward voltage of 3.0-3.6V, is that when the nominal 1W LED in flow through the 350 mA current, the voltage across it may 3.1V, 3.2V or 3.5V may also be other value, high-power 1W white LED lighting to guarantee the life of high-power 1W white LED lighting The lighting manufacturers recommended lamp factory with 350mA current to drive high-power 1W white LED lighting by high-power 1W white LED lighting both ends of the forward current of 350 mA, the forward voltage across a small increase, will forward current of a substantial rise in the high-power 1W white LED lighting, high-power 1W white LED lighting to temperature soared to accelerate high-power 1W white LED lighting light fades, the high-power 1W white LED lighting the lower life expectancy of the lamps, LED lighting directly scrapped if the consequences of more unsatisfactory. Factors due to the change between the voltage and current of the LED power, so we must also LED power supply design needs a higher level of quality assurance.

         
LED constant current source driver LED driver, LED constant current source drive, without limiting resistor in series in the output circuit current LED power upstream is also not subject to changes in the external power supply voltage, ambient temperature changes, and LED parameters the excellent characteristics of the discrete nature of the impact, so that it can maintain a constant current, give full play to the LED lighting using LED constant current power supply to the LED lamps, LED power during will automatically detect and control flow through the LED lighting The current, therefore, do not have to worry about the excessive current flows through the LED, there is no need to worry about the load short-circuit power are burned in the power of the moment.

       
LED lighting manufacturers worried LED power driver board selected electrolytic capacitors will affect the life of the drive power supply, which is a wrong understanding, such as: If I choose to 105 degrees, and the life of 08,000 hours of high-temperature electrolytic capacitors, electrolytic capacitor life according to the prevailing estimate "for every 10 degrees of heat, LED lighting life doubled, so the working life of 16,000 hours in 95-degree environment, if we work in an environment of 85 degrees life of 32,000 hours, in an environment of 75 degrees The working life of 64,000 hours, the actual operating temperature is lower, then life will be longer! So, by the above data analysis, if we choose a high quality electrolytic capacitor manufacturing and design, so basically worried LED power supply manufacturers products life problem can be solved.

       
Our LED lighting production and design engineers should be aware of this fact: because LED lighting in the actual work normal power operation, sustained a large amount of heat energy, the center of the temperature of the lamp itself will quickly climb will be released, If the power consumption of the manufacturing LED lighting wattage is higher, the effect of its thermal energy is higher. LED lighting chip temperature rise will cause abnormal changes in the electro-optical conversion efficiency of generation of LED light-emitting components performance dramatically reduce the most serious situation will stop running, and experimental data analysis from the engineers: LED lighting heat rose by five degrees, the luminous flux of the LED lighting will be pulled down by 3 percentage points, so whether you are a LED panel lights or LED fluorescent tube or LED guardrail tube design and manufacturing in the city lighting lighting project, must LED lighting heat problem given adequate attention, must get good heat dissipation problems such as: increase the cooling area of ??the body of the light source of LED lighting, as well as lower the working temperature of the LED lighting as much as possible, with the relevant conditions case, you can design the LED power section and LED lighting light source part specially designed processing, not the pursuit of other effects to the neglect of high quality LED lighting and LED drive power supply design selection also need to consider the good lighting and the working temperature of the power supply problem, any LED lighting design, such as: energy-saving lighting LED guardrail tube, LED fluorescent tubes, LED panel lights, LED spotlights, LED ceiling light, LED Bulb, LED ceiling lamp, LED downlight, etc. can mean the pursuit of volume or viewing discarded the characteristics of the product itself: energy saving, long service life, and a competitive advantage.