What should you pay attention to when choosing LED tube power supply?
The LED tube power supply is the heart of the LED tube, which directly affects its life. Pay attention to the following points
1. Why does the LED tube power supply have to be constant current?
The characteristics of LED semiconductors determine that they are greatly affected by the environment. If the temperature increases, the current of the LED will increase; the current of the LED will also increase. Exceeding the rated current operation will greatly reduce the
Short LED lifespan. The ED constant current is to ensure that its working current remains unchanged when environmental factors such as temperature and voltage change. The requirement for constant current accuracy is generally around 2-3%.
2. How can the LED tube power supply match the lamp?
First of all, it is necessary to carefully calculate according to the number of series and parallel, and choose the best series and parallel connection method. The voltage and current applied to each LED are the same, and the effect of the power supply can play the best performance.
The best way is to design the serial and parallel way first and make it tailor-made.
3. What is the most suitable working current of the LED tube power supply?
- Generally, the rated working current of 2835 lamp bead LED is 60 mA, and some factories have used it all at the beginning, and designed 60 mA.
Ideally, the luminous efficiency is relatively high. Of course, the use of high-efficiency lamp beads should be calculated according to the power efficiency. High-efficiency power supplies have high luminous efficiency.
4. What is the working voltage of the LED tube power supply?
The recommended working voltage of LED is 3.0-3.4V. After testing, most of them work at 3.125V, so it is more reasonable to calculate according to 3.125V. The total voltage of M lamp beads in series
=3.125*M. Usually the voltage of 12 strings is 38v and the voltage of 24 strings is 74v
5. How wide should the series-parallel and wide voltage of the LED panel be?
In order to make the LED fluorescent lamp work in a wide input voltage range (full voltage) AC85 ~ 265V, it is very important to connect the LEDs in series and in parallel.
However, the progress of the current LED tube power supply can generally achieve full voltage. Some PF values are as high as 0.98
6. For the LED tube power supply containing electrolytic capacitors, pay attention to high-quality capacitors. The service life is 10,000 hours, and 105 degrees is better.
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