Fluorescent tube is widely used in daily life, supermarkets, schools, office market, subway, etc., when it comes to appear with the public places, extensive use of fluorescent lights could be seen! LED The energy saving fluorescent lamp performance, after a long period of hype, we have been very accepted, but returned to spend heavily for LED fluorescent tubes, many of which are now come to a low-cost energy-saving lamps with the same situation: saving money and not section ! But a lot of waste of money, how to make LED service life and brightness to the satisfaction of using the standard, is a very meaningful topic! LED fluorescent tube to maintain long life and high brightness, problems to be solved is: Power supply , LED light, heat, security, four key technologies.
I. Power supply Power first and foremost requirement is high efficiency, high efficiency products, lower the heat on the stability of the inevitable high. Often useful to supply some of isolated and non-isolated two programs are relatively large volume of isolation, low efficiency in use, installation will have many problems, as non-isolated products in the market for the prospects, in which we discuss the non-isolated driver program.
The use of non-isolated LED fluorescent lamp power supply to Taiwan's technology companies A704WFT wide Peng example, A704WFT the MOS control plug-in, the basic circuit shown in Figure 1:
Basic circuit diagram Power supply features: 1, electricity supply (85 ~ 265V), external MOS, power unlimited;
2, low power, high efficiency, high power factor;
3, with the load and short circuit protection, output overvoltage protection, current ripple characteristics of a good, similar to DC output current DC, no lights flash phenomenon, high load capacity, can drive up to 600mA of current;
4, customers have made the standard circuit 15W, 88% efficiency, power factor 0.91, can be certified by CE, including EN55015 for EMI testing, lighting Lighting The following C type harmonic standard 25W, EFT's 1000V burst test, ESD of 2000V ESD test. 15 string application can output a low voltage control, without the use of traditional large satellites Capacitor May well control the output current harmonics;
5, A704's LED solar applications mature and reliable, we can provide LED fluorescent lamp can be tested through EMC PCB BOM table reference lines and to improve the speed of product design and development customers!
2, LED light source Sulfur Cummings patent by the Taiwan LED lamp structure of beads, their Chip Placed on the pin of, heat over foot of silver produced by the node directly to the chip tropical out-line with traditional products and traditional products in the cooling patch has qualitatively different, the chip junction temperature is not cumulative, thus ensuring a good light source lamp beads use, ensure long-life light source lamp beads, low-light decline.
Traditional product placement, though, the golden chip connected through positive and negative, but also to chip the heat for gold wire connected to the silver feet, thermal and electrical conductivity were conducted by the money, the heat accumulation time will directly affect the long life of LED fluorescent tube.
The traditional route and thermal conductivity of product placement as follows Figure 2:
And Okinawa Cummings of the LED transmission routes and methods are as follows Figure 3:
Okinawa Cummings's patented LED chip cooling structure allows the heat generated by the node quickly brought out, the chip Department does not generate heat accumulation, LED light source in order to achieve long life lamp beads can be used. And Okinawa Cummings companies in the process of LED lifetime test for high and low temperature impact, through reflow, high temperature and humidity of the use of complex application environments have done a complete laboratory analysis to ensure the normal use of low-light decline of Long Life!
3, heat Will be introduced and applied to thermal infrared radiation, fluorescent tubes is an important means to improve lamp life. Consideration in the heat, we heat LED light source lamp beads separate heat and power, 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 to achieve may be smaller, distributed through out the thermal radiation is a fluorescent tube into serious account. The following is what we do LED fluorescent tube test data, the LED solder silver foot outside the measured temperature was 58 degrees.
Test findings Above data as input power: 11.2 watts of luminous flux in: 890LM when the test report. The maximum tube temperature of 40.213 degrees, so the temperature to power Capacitance Device can work comfortably long, thus ensuring the supply of long-life use!
4, safety Security, where the main flame-retardant plastic tube that PC, because infrared heat can penetrate the PC pipe, we design considerations when using LED lights can be more consideration of their safety, physical insulation with plastic, even if the use of non-isolated power supply can be used to ensure absolute safety.
LED fluorescent lamp has been developing for a long time, from the effect of energy saving point of view, its future is very broad application area, in addition to energy saving, its safety, long life use that we should be concerned!
Safe! LED fluorescent lamp in the design of the first element, use the PC fluorescent flame-retardant materials, in solving the security problem, how to improve the life of the above items proposed solution to give the number of LED fluorescent tube manufacturers to provide more way of thinking! I am a professional writer from Components Electronic suppliers, which contains a great deal of information about united motors scooter , smoke on the water tab, welcome to visit!
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