Led fluorescent lamp power supply production skills
My opinion is that because the power supply must be built into the lamp, and heat is the biggest killer of LED light decay, the heat must be small, that is, the efficiency must be high. Of course there must be a high-efficiency power supply. For T8 lamps with a length of one meter and two, it is best not to use one power supply, but two, one at each end, to disperse the heat. So as not to concentrate the heat in one place. The efficiency of the power supply mainly depends on the electrical structure and the devices used. Let's talk about the electrical structure first. Some people also say that the power supply should be isolated. I think it is absolutely unnecessary, because this kind of thing is originally placed inside the lamp body, and people can't touch it at all. Isolation is not necessary, because the efficiency of isolated power supplies is lower than that of non-isolated power supplies. Second, it is best to output high voltage and small current, so that the power supply can achieve high efficiency. What is commonly used now is BUCK power, that is, step-down power. It is best to set the output voltage above 100V, and the current is set at 100MA. For example, when driving 120, preferably three strings, each string of 40, the voltage is 130V, and the current is 60MA. . This kind of power supply is used a lot, I just think it is a bit bad, if the switch tube is out of control, the LED will run out. LEDs are so expensive now. I am more optimistic about the step-up type. The advantages of this type of electricity, I have repeatedly said. This can ensure foolproofness. If you burn out a power supply, you will only lose a few dollars, and you will lose hundreds of yuan in cost if you burn an LED fluorescent lamp. So I always recommend a booster power supply. In addition, it is easy to make the PF value higher for the boost type, while the step-down type is more troublesome. My absolute advantage of step-up type for LED fluorescent lamps is still overwhelmingly stronger than step-down type. There is only a shortcoming of one year, that is, in the case of 220V mains input, the load range is relatively narrow. Generally, it can only be applied to 100 to 140 one or two strings of LEDs. For less than this number or sandwiched in the middle, It is not convenient to use. However, nowadays LED fluorescent lamps are generally used for the 60cm length of 100 to 140, the one of 1.2 meters, generally two hundred to two hundred and six, it is still okay to use. Therefore, LED fluorescent lamps generally use non-isolated step-down voltage and non-isolated boost voltage. This kind of electricity used in LED fluorescent lamps should be regarded as my own initiative.
LED fluorescent lamp power supply Opinions on high PFLED fluorescent lamp power supply and high current LED fluorescent lamp power supply:
Personally, I think that these practices are a lot of time and they are nothing but the last. Now let me ask what are the advantages of LED over traditional lamps, first, energy saving, second longevity, and then not afraid of switching, right? However, the high PF methods currently used all use passive valley-filling PF power. The original driving method is 48 series, 6 parallel to 24 series and 12 parallel. In this case, the efficiency will be lowered under 220V. About five percentage points, so the LED fluorescent lamp power supply, the heat is higher, the lamp beads will also be affected a little.
There is another problem, that is, the practice of 24 series and 12 parallel will make the wiring of the LED fluorescent lamp bead become uncomfortable, and the wiring is not easy. In my opinion, the best way is to use a series of 48 strings, mainly because of high efficiency, low heat generation, and easy wiring and not complicated.
What's more, there are still people who have proposed 24 parallel and 12 series. This method is only suitable for isolated power supplies, and non-isolated power supplies are not applicable at all. Some people who don't know the power supply knowledge feel that it is better to achieve a constant current 600MA output from a non-isolated power supply. In fact, he has not carefully tried it in the lamp himself. It is strange that it is not hot.
So, what low-voltage and high-current is now used as LED fluorescent lamp power supply, it is really trying to do nothing. Encouraged, continue to talk.
