LED street lamp lighting need to pay attention to the problem

The LED street lamp lighting what are the problems need to pay attention to, the following follow high lamp manufacturers to understand it,

1, LED street lamp power constant current precision. Constant current precision of some power supply on the market, constant current, such as a recommendation from the popular market,. General requirements in & plusmn; 3% is ok. According to the design of 3%. Production of power supply to fine-tune to achieve & plusmn; Error of 3%. Why

2, LED street lamp power supply must be constant current? LED lighting materials are greatly influenced by the environment, on its characteristics such as higher temperature changes, the LED current increases, the increase of voltage, current of the LED will increase. And the LED constant current is in the environmental factors such as temperature and voltage changes, to ensure the working current value remains the same.

3, the working voltage of LED street lamp power supply. General LED the recommended working voltage is 3. 0 - 3. 5 v, through the test, most of the work in 3. 2 v, so press 3. 2 v calculation formula is reasonable.

4, LED street lamp power supply board series parallel with wide voltage to how wide? To make the LED street lamp power supply work in the input voltage range is wide range AC85 - 265 v, the LED lamp board series parallel way is very important. Output voltage when the input voltage 220 v to 156 v. That is to say, the serial number of not more than 45 series. Parallel number not too much, otherwise the working current is too large, power supply heating. New energy that China and the United States have a wide voltage, APFC active power compensation is to use the L6561/7527 the voltage up to 400 v, and then step down, the equivalent of two switching power supply. This scheme use only under certain conditions.

5, how much is the working current of LED street lamp power supply is the most appropriate. LED the rated current of 350 ma, for example, some factories use from the start, the design of 350 ma