Currently, LED fluorescent lighting market is relatively active, LED driver power manufacturers are divided into three major types: the first category is to do the LED chip or LED lights factory, homeopathic downstream penetration; the second category is the original factory to do ordinary lighting ; The third is completely new plants, which used to be power supplies or other products or new startups. LED fluorescent lamp power LED fluorescent lamp is a very important part, if not properly selected, LED fluorescent lamp can not play his due performance, and may even not be able to use normal lighting. Here I made some small LED fluorescent lighting advice for your reference. 1, LED fluorescent lamp power why constant current it? The characteristics of the LED semiconductor determines its environmental impact, such as temperature, LED current will increase; voltage increases, the LED current will increase. Long-term over rated current work, will greatly shorten the life of the LED. The LED constant current is the temperature and voltage changes in environmental factors, to ensure that the current does not change. 2, LED fluorescent lamp power how to match the light board? Some customers design the light board first, look for the power again, find it difficult to have the right power, either the electric current is too big, the voltage is too small (for example I> 350mA, V <40V); Or the electric current is too small, the voltage is too high 40mA, V> 180V), the result is serious fever, low efficiency, or the input voltage range is not enough. In fact, choose a best string and then connected to the voltage and current added to each LED is the same, but the power of the results can play the best performance. The best way is to communicate with the power supply manufacturers, tailor-made. 3, LED fluorescent lamp power supply current is how much is the most suitable? General LED rated current of 20 milliamperes, some factories started to use to do, design 20 mA, in fact, this current working fever is very serious, after many comparative tests, designed to 17 ~ 19 mA is to compare Ideally, the recommended design is 18mA. 4, LED fluorescent lamp power supply voltage is how much? The general recommended operating voltage LED is 3.0-3.5V, tested, most of the work at 3.125V, so calculated by 3.125V more reasonable. M lamp series voltage in series = 3.125 * M 5, LED light board series and wide voltage parallel to how wide it? LED fluorescent lamp to work in the input voltage range of a wide range (full voltage) AC85 ~ 265V, the light board LED series parallel method is very important. Due to the current power supply is generally non-isolated step-down power supply, in the requirements of wide voltage, the output voltage should not exceed 72V, the input voltage range can reach 85 ~ 265V. In other words, the number of strings does not exceed 23 strings. Not too much parallel number, or the working current is too large, serious heat, it is recommended for 6 and / 8 and / 12 and. The total current does not exceed 240 mA amperes as well. There is also a wide voltage program is to use L6561 / 7527 first voltage up to 400V, and then step-down, equivalent to two switching power supply, the cost is doubled, this program cost is not high, there is no market. 6, LED series and parallel PFC power factor and wide voltage relationship is what kind of? Currently on the market power PFC in three cases: one is without PFC circuit, the PFC is generally around 0.65; one is with a passive PFC circuit, light board well prepared, PFC generally around 0.92; also With one type of active active 7527/6561 circuit, the PFC can reach 0.99, but the cost of this solution is more than double that of the second solution. So the second option more. For passive PFC circuit: also known as valley filled PFC circuit, the operating voltage range is half the peak AC input voltage. If the input is 180V, the peak value is 180 * 1.414 = 254V, half of the peak voltage is 127V, minus the step-down voltage difference of 30V, the maximum output is 90V, so the maximum number of LED lamp beads 28 strings. Therefore, in order to get relatively large power factor, the number of lamp beads in series can not be too much, otherwise, it will not reach the requirement of low voltage. 7, LED fluorescent lamp constant current accuracy is the most appropriate number? Some of the market power supply constant current accuracy is too poor, such as the market popular PT4107 / HV9910 / BP2808 / SMD802 program constant current program, the error of ± 8% or ± 10%, constant current error is too large. The general requirements of ± 3% on it. Press 3% of the error, 6 parallel, each error is about ± 0.5%, if it is 12 parallel, each error is about ± 0.25%, the accuracy is sufficient. Accuracy is too high, the cost will be greatly increased. And LED, 17 milliamperes and 17.5 milliamperes have little effect. 8, isolated / non-isolated General isolated power as made 15W, on the LED lamp, the transformer is very large, it is difficult to put in. Especially for the T6 / T8 lamp, it is almost impossible, so the isolation is generally only 15W, less than 15W, and the price is very expensive. Therefore, the isolation of the cost is not high, the general non-isolated more mainstream, the volume can be made smaller, the minimum can be achieved high 8 mm, in fact, non-isolated safety measures well, there is no problem. 9, LED fluorescent lamp power efficiency Output power (output LED voltage * output current / input power). This parameter is particularly important, if the low efficiency means that a large part of the input power into heat emitted; if it is installed in the lamp will have a very high temperature, coupled with a light-to-light ratio of our LED Exhaust heat, it will be superimposed to produce a higher temperature. And the life of all the electronic components inside our power supply will be shortened as the temperature rises. So efficiency is the most fundamental factor that determines the power life, efficiency can not be too low, otherwise consume too much heat on the power supply. Generally more than 80% on it, but the efficiency of light board matching connection method. < 1 2 > Electric Floor Scrubber,Tile Floor Scrubber,Tile Floor Cleaning Machine,Automatic Floor Cleaning Machine Nantong Weizhuo Environmental Protection Equipment Co.,Ltd , https://www.cwznts.com