The problems that need to be paid attention to when LED street lights are lit

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The problems that need to be paid attention to when LED street lights are lit

Update:01-06-2021

Summary: What are the issues that need to be paid attention to when lighting LED street lights? Let’s take a look below. 1. Constant current accuracy of

What are the issues that need to be paid attention to when lighting LED street lights? Let’s take a look below.

1. Constant current accuracy of LED street lamp power supply. Some power supplies on the market have poor constant current accuracy, such as the popular recommended solutions on the market and other constant current solutions. The general requirement is within ±3%. According to the 3% design plan. The production power must be fine-tuned to achieve ±3% error.

2. Why must the LED street lamp power supply have a constant current? The characteristics of LED lighting materials determine that they are greatly affected by the environment. For example, as the temperature changes, the current of the LED will increase, and the increase of the voltage will increase the current of the LED. And LED constant current is to ensure that its operating current value remains unchanged when environmental factors such as temperature and voltage change.

3. The working voltage of the LED street lamp power supply. Generally, the recommended working voltage of LEDs is 3.0-3.5V. After testing, most of them work at 3.2V, so the 3.2V calculation formula is more reasonable.

4. How wide is the series-parallel connection and wide voltage of the LED street light power supply board? To make the LED street light power supply work in a wide range of input voltage AC85-265V, the LED series-parallel connection of the light board is very important. When the input voltage is 220V, the output voltage can reach 156V. In other words, the number of series does not exceed 45 strings. Do not connect too many in parallel, otherwise the working current will be too large and the power supply will generate serious heat. Sino-American New Energy believes that there is also a wide voltage solution. APFC active power compensation is to use L6561/7527 to raise the voltage to 400V first, and then step down, which is equivalent to two switching power supplies. This program is only used under certain conditions.

5. What is the most suitable working current of the LED 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 the design is 350 mA.

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