LED fluorescent in the four key technology design

Fluorescent tubes in their daily lives in a wide range of applications, supermarkets, schools, offices, subway, etc., anything can one say that the public places, can see the heavy use of fluorescent lights! LED fluorescent lamp power-saving performance, after a long period a large number of publicity, we have been very accepted, but the flower higher price back LED fluorescent tube, many of which are now reached a low-cost energy-saving lamps with the same situation: rather than saving Festival Money! It was a substantial waste of money, how to make LED lifetime and brightness to allow the use of satisfactory standards, is a very meaningful topic! LED fluorescent tube to maintain the long-life and high brightness, problems to be solved is: power supply, LED light source, cooling, security, four key technologiesPower supply:
First and foremost requirement is that the efficiency of power supply, high efficiency products, heat stability, low then high on the inevitable. Some useful power is usually isolated and non-isolated two kinds of programs, too large volume of isolation and less efficient in use, the installation will have a lot of problems as their non-isolated products in the market prospects of, in this our main discussion of non-isolated drive the program.
The use of non-isolated LED fluorescent lamp power supply to Taiwan, Guang-Peng technology companies A704WFT for example, A704WFT of the MOS pipe plug-in, the basic circuit shown in Figure 1:
Basic circuit diagram

Power supply features:
1, electricity supply (85 ~ 265V), external MOS, power restrictions;
2, low-power, high efficiency, power factor is high;
3, with open load and short circuit protection, output overvoltage protection, current ripple characteristics of good approximation of the output current DC DC, no lights flash phenomenon, a high load capacity and can drive up to 600mA of current;
4, the customer has made a 15W standard circuit, the efficiency of 88%, power factor 0.91, can be passed CE certification, including EN55015 for EMI testing, lighting 25W the following C type harmonic standards, EFT burst of 1000V test, ESD The 2000V static test. 15 string application can output a low voltage control, without the use of traditional big stars capacitors, can be well controlled, the output current harmonics;
5, A704's LED daylight applications more mature and reliable, we can provide LED lamp may be too EMC test PCB lines and BOM table reference, increase customer speed of product design and development!
LED light source

Grand Cummings patent from Taiwan LED lamp structure of beads, their chips placed on pins, heat over silver pin directly to the chips produced by the tropical node out-line with the traditional products, and traditional products in the cooling patch there are qualitative differences in the chip junction temperature will not result in a cumulative, thus ensuring a good light source lamp beads use, to ensure long-life light source lamp beads, low-light decline.
Traditional SMT products, although the golden thread through the chip connection is negative, but also so that heat generated by chips off the golden thread connected to the silver feet, heat and electrical conductivity are taken up by money and conduction, heat accumulation will be a long time a direct impact on the life of LED fluorescent tube.
Traditional SMT product line, and method of heat transfer are as follows
Figure 2:
The Grand Cummings of the LED transmission routes and methods are as follows
Figure 3:
Grand Cummings's patented LED chip cooling structure of the node allows the heat generated by the rapid take out the chip does not generate heat at the accumulation of LED light source in order to achieve long-life lamp beads can be used. And the Grand Cummings LED life in the testing process, for high and low temperature impact, too reflow soldering, high temperature and high humidity of the use of a variety of complex application environments have done a complete laboratory analysis to ensure the normal use of the low-light decline of the Long Life!
Thermal infrared radiation will be introduced and applied to fluorescent tubes, is an important means to improve lamp life. In the thermal considerations, we will be LED light source lamp beads separate cooling heat and power, the interference from each other in order to ensure heat dissipation is reasonable.
There are three ways of heat conduction, convection, conduction and radiation. In a closed environment, convection and conduction is possible to achieve smaller, distributed through out the thermal radiation is considered the focus of fluorescent tubes. The following is what we were doing LED fluorescent tube test data, in the LED silver foot pad outside the measured temperature was 58 degrees.
Test results of the report
The above data as the input power: 11.2 watts, luminous flux in the: 890LM when the test report. The maximum tube temperature of 40.213 degrees, so that the temperature so that the power supply capacitor can calmly work long hours, thus ensuring long-life use of power!
Security, this is mainly that flame-retardant PC plastic tubes, because the infrared heat can penetrate the PC pipe, then we design considerations when using LED lights can be more consideration to their safety, with the plastic insulation of the physical way, even if the use of non - isolated power supply can be an absolute guarantee your safety.
The development of LED lamp has a fairly long time, from the effects of energy-saving point of view, its future application of face is quite wide, in addition to energy saving, its safety, long life use is we should be concerned about!
Safe! The design of the LED lamp is the first element, the use of flame-retardant materials, fluorescent PC in the solution of security problems, how to improve the life of each item submitted by the above solution want to give a number of LED fluorescent tube manufacturers to provide more way of thinking!