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LED lighting lighting engineering, lighting industry is affected by the global environment, also has its industrial characteristics. And LED street lamp power is exactly what LED the development of the most important right now, for the related design on the LED technology, there are many kinds of schemes with the unique design hand



LED lighting' 领导( LightingEmittingDiode) That is led lighting, lighting is a solid light-emitting semiconductor devices. 】 Industry lighting lighting engineering, both affected by the global environment, also has its industrial characteristics. And LED street lamp power supply' LED street lamp power supply is the world's most efficient switching power supply is as high as 95%, high power factor is up to 0. 99, high reliability long life, accord with IP67 waterproof level; Have over voltage through the temperature, short circuit protection, constant current constant voltage optional, with lightning protection design ( IE - 61000 - 4 - 5类) In line with the global safety and electromagnetic compatibility standards! The power consumption is only half of many competing products, because the power consumption is low, so the temperature of the power components is reduced, so that significantly enhance the reliability of the product. 】 Is exactly what LED the development of the most important right now, for the related design on the LED technology, there are many kinds of schemes with the unique design technique, we have to look at one by one.

1, why must be constant current LED street lamp power supply?

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. More than rated current job for a long time, can greatly shorten the service life of the LED lamp bead. 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.

2, LED street lamp power constant current accuracy

some constant current precision of the power supply on the market is poor, constant current, such as a recommendation from the popular market, error & plusmn; 8%, constant current error is too big. 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%.

3, the working voltage of LED street lamp power supply

generally recommend LED the 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. Total N lamp bead series voltage = 3. 2 * N

4, 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 lighting design factory use from the start, design 350 ma, actually this electrical work shed fever is very serious, through the contrast test for many times, designed to be 320 ma is ideal. To minimize the calorific value, let more electricity into visible light.

5, 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. Try not to use, wide voltage can be divided into AC220V, AC110V classified as far as possible, so as to ensure that the power supply reliability. As a result of current power supply is not commonly isolated step-down type constant current power supply, when required voltage 110 v, output voltage not over 70 v, serial number of not more than 23 string. 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. Solution, there is 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.