9 points of technical knowledge related to LED street lamp driver design
1. Regarding the LED street light driver, why must constant current be required?
The characteristics of LED lighting materials determine their significant impact on the environment. For example, when the temperature increases, the LED current increases, and when the voltage increases, the LED current also changes. Long-term operation higher than the rated current will greatly shorten the life of the LED lamp beads. Setting the LED light in constant current mode is to ensure that the light works in a stable constant current state when environmental factors such as temperature and voltage change.
2. The constant current accuracy of LED street lights.
In the market, some drivers have poor constant current accuracy, as a popular suggested solution in the market for constant current, ±8% error, which is too large. The general requirement is ±3%. 3% by design. Divers should adjust to ±3% error in production.
3. LED street lamp power supply voltage.
Generally speaking, the recommended working voltage of LED chips is 3.0-3.5V. Tests approve most chips to work in 3.2V. It is reasonable to calculate the formula with 3.2V. The total voltage of N lamp beads in series = 3.2 * N.
4. What is the most suitable working current for LED street light driver?
For example, LEDs are rated to operate at 350 ma. Some lighting design houses start using all the current and design 350 mA. In fact, the lights that work in this situation can cause a very severe fever. After comparative testing, a target of 320 mA is ideal. To reduce heat, convert more electrical energy into visible light energy.
5. How wide is the voltage range? The relationship between the voltage range and LED street lights in series and parallel.
In order to make the LED street light driver work in the wide input voltage range of AC85-265V, the LED series-parallel mode is very important. Try not to use wide voltage, try to divide AC220V, AC110V, etc., to ensure the reliability of the driver. Since the current drive is usually a non-isolated step-down constant current drive, when the required voltage is AC110V, the output voltage should not exceed 70V, so this series of numbers should not exceed 23 strings. When the input voltage is 220V, the output voltage can reach 156V. That is, the number of connections is not more than 45 strings. The number of parallel connections should not be too many, otherwise the working current is too large, and the driver will be overheated seriously. There is a wide voltage range solution, APFC active power compensation. Utilize the L6561/7527 to increase the voltage to 400V and then step down, which is equivalent to two switching power supplies. This solution should only be used under certain conditions.
6. Isolation/non-isolation LED street light driver.
Separately driven, generally 15W. In the LED lamp driver tube, the transformer is too bulky to fit in. Mainly depends on the specific space structure, a single driver can generally perform 15W. Above 15W is very rare and the price is expected to be very expensive. Therefore, isolated cost performance is lower. Usually non-isolated submersibles are the mainstream, and non-isolated divers can be made smaller. Minimum height up to 8mm. In fact, as long as non-isolated security measures are in place, there shouldn't be any problems. Space permitting, the isolation drive works well.
7. How does the LED street light driver match the LED bead board?
Some clients have designed a good light panel and then found the driver after finishing the design. But they have a hard time finding the right driver. The current is too large, the voltage is too small (such as 7X1WI> 350mA, or V < 20V); or the current is too small, the voltage is too large < 200mA or V> 25V), resulting in severe heating, low efficiency, or insufficient input voltage range. Actually, choose the best way to do it in series and parallel, where the voltage and current are the same on each LED bead. Plus, the rider can perform at their best. Your best bet is to communicate with drivers, tailor them for them, or produce drivers yourself.
8. LED street lamp driving efficiency.
Input power minus output power value. This parameter is particularly important, the higher the value, the lower the efficiency. This means that a significant portion of the input power is converted into heat; if installed inside the lamp, it will generate very high temperatures. As the LED light efficiency dissipates heat, the heat will be superimposed to create higher temperatures, and the lifespan of all the driver's electronic components will decrease as the temperature increases.
Therefore, efficiency is the most fundamental factor in determining the life of a driver. Efficiency cannot be too low. Otherwise, the heat consumed by the driver is too large. Non-isolated efficiency is higher than individual drives. Generally speaking, more than 80% is OK, but the efficiency is related to the matching connection of the light board.
9. LED street light drive cooling.
Under low thermal conditions, the main factor of cooling liquid exists in the LED street lamp drive beads, which greatly prolongs the life. Aluminum alloy is generally used, which is easier to dissipate heat. That is to say, the driving beads of the LED light are attached to the aluminum plate to maximize the external cooling area. In the face of such a huge LED market full of vitality, with the development of the technology field and some leading positions in the technology field, I believe that the Chinese LED industry will become stronger.
Benwei Lighting is an LED Tube, LED flood light, LED Panel Light, LED High Bay, LED manufacturer with 12 years of experience. If you want to purchase a high-quality LED flood light or have a more in-depth understanding of the application of LED flood lights, please contact send us inquiry， our web: 
https://www.benweilight.com/.
