Solar street light pole street lamp holder using constant current source

1, 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 for a long time, can greatly shorten the service life of the LED lamp bead. And the LED constant current is



1, 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 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 that its current value remains the same. 2, solar street lamp power supply: constant current precision constant current precision of some power supply on the market, such as a recommendation from the popular market constant flow scheme, the error of plus or minus 8%, constant current error is too big. General requirements in the plus or minus 3%. According to 3% of the design, the production of power supply to fine-tune can achieve error of plus or minus 3%. 3, solar street lamp power supply voltage: general LED the recommended voltage is 3. 0 - 3. 5 v, through the test, mostly in 3. 2 v, so press 3. 2 v calculation formula is reasonable. Total N lamp bead series voltage = 3. 2*N。 4, what is the current solar street lamp power supply is the most suitable: LED the rated current of 350 ma, for example, some factories use from the start, design 350 ma, actually the electrical flow 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, solar street lamp power supply board series parallel with wide voltage more wide: to make the LED solar street light [ LED solar street lights with solar radiation as energy, using solar panels to convert solar energy to the battery to charge during the day and night to use LED light source power supply lighting, battery without complex and expensive pipeline laid, can be arbitrary adjust the layout of the lamps and lanterns, safety and energy saving no pollution, no manual work is stable and reliable operation, saving electricity maintenance free. 】 【 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, or current is too large, the power supply heating. There is a wide voltage, APFC 【 Active power factor correction ( 有源功率因数校正,简称APFC) Technology for network side power factor can increase power electronic devices, reduce the line loss, save energy and reduce power grid harmonic pollution and improve the quality of power supply and other advantages, widely used in many industries. 】 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.