The lighting project of LED lighting industry is not only affected by the environment, but also has its industry specificity. The Led Street Light power supply is the top priority of the current LED development. For the related design of LED technology, there are already a variety of solutions and unique design methods.
1. Why does the power supply of LED Adjustable Street Lights have to be constant current?
The characteristics of LED lighting materials determine that they are greatly affected by the environment. For example, if the temperature changes, the current of the LED will increase, and the voltage will increase, and the current of the LED will also increase. Exceeding the rated current for a long time will greatly shorten the service life of the LED lamp beads. The LED constant current is to ensure that its operating current value remains unchanged when environmental factors such as temperature and voltage change. 2. LED adjustable street lamp power supply constant current accuracy
Some power supplies on the market have poor constant current accuracy. For constant current solutions such as popular recommended solutions on the market, the error reaches ±8%, and the constant current error is too large. The general requirement is ±3%. According to the 3% design scheme. The production power supply needs to be fine-tuned to achieve ±3% error.
3. Working voltage of LED Adjustable Street Light power supply
Generally, the recommended working voltage of LED is 3.0-3.5V. After testing, most of them work at 3.2V, so it is more reasonable to calculate according to 3.2V. The total voltage of N lamp beads in series = 3.2* N 4. What is the appropriate working current of the LED adjustable street light power supply?
For example, the rated working current of the LED is 350 mA. Some factories use it up at the beginning and design 350 mA. In fact, the working heat is very serious under this current. After many comparison tests, it is ideal to design 320 mA. . Minimize heat generation and allow more electrical energy to become visible light energy. 
5. How wide should the series-parallel and wide voltage of the LED adjustable street light power board be?
In order to make the LED street lamp power supply work in the range of AC85-265V with a wide input voltage range, the series-parallel mode of the LEDs of the lamp board is very important. Try not to use a wide voltage, and it can be divided into AC220V and AC110V as much as possible, so as to ensure the reliability of the power supply. Since the current power supply is generally a non-isolated step-down constant current power supply, when the required voltage is 110V, the output voltage should not exceed 70V, and the number of series connections should not exceed 23 strings. When the input voltage is 220V, the output voltage can reach 156V. That is to say, the number of concatenations does not exceed 45 strings. The number of parallel connections should not be too many, otherwise the working current will be too large and the power supply will heat up seriously. There is also a wide voltage solution, APFC active power compensation is to first use L6561/7527 to raise the voltage to 400V, and then step down, which is equivalent to two switching power supplies. This program is only used under certain conditions. 6. Isolation/non-isolation
Generally, the isolated power supply is made into 15W and placed in the power tube of the LED street light. The transformer is very large and difficult to put in. It mainly depends on the space structure and depends on the specific situation. Generally, the isolation can only achieve 15W, and there are very few more than 15W, and the price is very expensive. Therefore, the height of isolation is not high. Generally, non-isolation accounts for the majority of the mainstream. The volume can be made smaller, and the smallest can be 8 mm high. In fact, the safety measures for non-isolation are done. There is no problem. It can also be used as an isolated power supply if space permits.
7.How can the power supply of LED adjustable street light be matched with the lamp bead board ?
Some customers design the light board first, and then find the power supply, and find that it is difficult to have a suitable power supply, either the current is too large and the voltage is too small (such as 7X1WI>350mA, or V<20V); or the current is too small and the voltage is too high (such as I<200mA or V>25V), the result is severe heat generation, low efficiency, or insufficient input voltage range. In fact, choose a best series-parallel connection method, the voltage and current applied to each LED are the same, and the effect of the power supply can exert the same performance. The way is to communicate with the power supply manufacturer first and customize it. Or produce your own power supply.
