Solar LED street lamp ordinary garden light factory technical ten little secret

1, LED street lamp power supply why must be constant current 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. Long-term work more than rated current



1, 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. 】 Why must the power constant current? LED lighting' 领导( LightingEmittingDiode) That is led lighting, lighting is a solid light-emitting semiconductor devices. 】 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 supply power constant current precision constant current precision of some power supply on the market, constant current, such as a recommendation from the popular market, error of plus or minus 8%, constant current error is too big. General requirements in the plus or minus 3%. According to the design of 3%. Production of power supply to fine-tune can achieve error of plus or minus 3%. 3 general LED, LED street lamp power supply voltage of the power supply of the recommended operating 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 * what N4 interchange, LED street lamp power supply current of the power supply to the most appropriate? LED the rated current of 350 ma, for example, some factories 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 more wide? To make the LED street lamp power supply working in the input voltage Used to represent binary variables in the two domain high [ Low] Positive or higher [ Low] Negative input voltage, usually use symbols Vi said. 】 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. 6, isolation/non isolated general power made 15 w, such as in the LED street lamp power tube, the volume of transformer is very big, it is difficult to put it in. Basically see space structure depending on the specific situation, isolated normally only do 15 w, little more than 15 w, and the price is very expensive. So segregation ratio is not high, generally is the isolation of the mainstream is more, the volume can be made smaller and the smallest can do 8 mm high, in fact, the isolation security measures ready, there is no problem. Space allows can also do the isolation power supply.