What are the precautions for choosing LED tube power supply?
The power supply of led tube is the heart of led tube, which directly affects its life. Pay attention to the following points:
1. Why must the LED tube power supply have a constant current?
The characteristics of LED semiconductors determine that it is greatly affected by the environment. For example, if the temperature rises, the current of the LED will increase; the current of the LED will also increase. Exceeding the rated current will greatly shorten the life of the LED. And LED constant current is to ensure that its operating current remains unchanged when environmental factors such as temperature and voltage change. The accuracy requirements for constant current are generally around 2-3%.
2. How can the power supply of the LED tube be matched with the lamp?
First, we must carefully calculate the number of series and parallel connections, and choose the best series and parallel connection method. The voltage and current applied to each LED are the same, but the effect of the power supply can exert the best performance. The best way is to design the serial and parallel method first and make it tailored.
3. What is the most suitable working current for the LED tube power supply?
Generally, the rated working current of 2835 lamp bead LED is 60 mA. Some factories use it up at the beginning. The design is 60 mA. After many comparison tests, it is ideal to design 50-55 mA, and the luminous efficiency is relatively high. , Of course, use high-efficiency lamp beads. The calculation should be based on 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 the calculation formula of 3.125V is more reasonable. The total voltage of M lamp beads in series = 3.125*M. Usually 12 strings, the voltage is 38v, 24 strings, the voltage is 74v
5. How wide is the series-parallel connection and wide voltage of the LED light board?
To make the LED fluorescent lamp work in a relatively wide range of input voltage (full voltage) AC85～265V, the series-parallel connection of the LEDs of the lamp panel is very important.
However, with the advancement of LED lamp power supplies, it is generally possible to achieve full voltage. Some PF values are as high as 0.98
6. For LED lamp power supplies containing electrolytic capacitors, pay attention to high-quality capacitors. The service life is 10,000 hours, and 105 degrees is better.
