To count the LED street lamp technology unknown secret ( Last) Dynamic | | industry lighting: solar led street lamp manufacturers in the countryside

For the LED street lamp believe that everybody is not strange, but how much knowledge about the LED street lamp technology you know? Today let's fine count about the LED street lamp technology those dirty little secret. Introduction to the working voltage of LED street lamp power supply in general, for the working voltage of the LED is recommended in 3. 0 ~ 3. 5 v, after tests found, are generally in 3. 2 v, so we according to 3. 2 v to calculation is more accurate. （ The total n in series with the lamp bead voltage is 3. 2 * n) two Why the LED street lamp power constant current? Because the LED lighting material properties its destined to have been influenced by the environmental factors slants big, for example, in the high temperature, LED the current also increases; The increase of the voltage, the LED current also increases at the same time. If work is a long period of time to excess, will LED lamp bead greatly reduce the service life. And the LED constant current is in a series of external environment factors such as voltage and temperature change, make sure the LED work stable output current value. 3. LED street lamp precision constant current power supply on the market today with some precision of constant current is relatively inferior power, but also popular with some recommended constant current program error rate is as high as & plusmn; 8%, need to know we are general requirements & plusmn; 3% 3%, so only in accordance with the design scheme of the power of the production to reach & plusmn; when fine-tuning Error of 3%. Four. How much is the working current of the LED street light electric power supply is the most suitable we know LED the rated working current is 350 ma, and just some factory is not much better than the direct use of 350 ma design, but in fact work under 350 ma of fever situation is very serious, is not reasonable. Then after the experiment many times and found 320 ma design is the most appropriate, as much as possible to reduce fever, let more electricity into visible light. Five. LED street lamp power supply board series parallel with wide voltage more wide? The industry know usually if we work to the LED street lamp power supply voltage range in a relatively wide range AC85 - 265 v, so you need to LED lamp plate series parallel way of support. Generally we are not using wide voltage, which the AC220V and AC110V are to be classified, so to guarantee the reliability of the power supply. In the present as the power supply is generally isolation step-down type constant current power supply, so the requirement of voltage 110 v, 70 v, output voltage, no more serial number nor 23 string. Similarly when the input voltage of 220 v output voltage can be up to 156 v. In other words, the serial number cannot be 45 series. Number of parallel also cannot too much, otherwise will working current is too large, lead to excess power heating. Finally we have a wide voltage, APFC active power compensation is to use L6561 ( $0. 4083). The voltage is too high to 7527/400 v, and then step down, is equivalent to have the two switching power supply. （ This plan below can be used with special circumstances)