At present, the LED fluorescent lamp market is relatively active, and LED drive power manufacturers are mainly divided into three major types:
The first category is the development of a factory that makes LED chips or LED lights. It is infiltrated downstream, and there is not much knowledge of LED power supply circuit knowledge and LED fluorescent lamp power knowledge.
The second category is the original factory that is doing general lighting. Everyone has entered a new product field, and knows a little about LED power circuit knowledge, but not much;
The third category is completely new factories. They used to do power or other products or new ventures, and they have some knowledge of LED power supplies, and some don't know much about them.
LED fluorescent lamp power supply is a very important component of LED fluorescent lamp. If it is not properly selected, LED fluorescent lamp can not play its proper performance, and may even not be able to use normal lighting. Below I made some small suggestions for LED fluorescent lighting, for your reference.
1. Why should LED fluorescent lamp power supply be constant?
The characteristics of LED semiconductors determine that they are greatly affected by the environment. For example, if the temperature rises, the current of the LED will increase. When the voltage increases, the current of the LED will also increase. Long-term operation beyond the rated current will greatly shorten the service life of the LED. The LED constant current is to ensure that its operating current does not change when environmental factors such as temperature and voltage change.
2. How can the LED fluorescent lamp power supply match the lamp panel?
Some customers first design the light board, then find the power supply, and find that it is difficult to have a suitable power supply, or the current is too large, the voltage is too small (such as I>350mA, V<40V); or the current is too small, the voltage is too high (such as I< 40mA, V>180V), the result is severe heat, low efficiency, or insufficient input voltage range. In fact, choosing the best string parallel connection method, the voltage and current applied to each LED is the same, and the power supply effect can achieve the best performance. The best way is to communicate with the power supply manufacturer and tailor it.
3. What is the most suitable working current for LED fluorescent lamp power supply?
The rated working current of the general LED is 20 mA. Some factories use it at the beginning, and design 20 mA. In fact, the working heat at this current is very serious. After many comparison tests, the design is 17-19 mA. Ideally, the recommended design is 18 mA.
4. What is the working voltage of the LED fluorescent lamp power supply?
The recommended working voltage of general LED is 3.0-3.5V. After testing, most of the work is 3.125V, so it is reasonable to calculate according to 3.125V. The total voltage of M lamp beads in series = 3.125*M
5. How wide is the series and parallel connection of the LED lamp board and the wide voltage?
In order to make the LED fluorescent lamp work in a wide range of input voltage range (full voltage) AC85 ~ 265V, the LED series and parallel connection of the light board is very important. Since the current power supply is generally a non-isolated buck power supply, when a wide voltage is required, the output voltage should not exceed 72V, and the input voltage range can reach 85 to 265V. In other words, the number of series is no more than 23 strings. Do not use too many parallels, otherwise the operating current is too large and the heat is severe. It is recommended to be 6 and /8 and /12. The total current does not exceed 240 mA. There is also a wide voltage scheme, which is to use L6561/7527 to raise the voltage to 400V, and then step down, which is equivalent to two switching power supplies, which cost twice as much. This solution is not cost-effective and has no market.
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