With low power consumption long life low heat environmental protection etc in many areas has been widely applied for LED-t5 br br 1 street lighting tunnel lighting LED Grill LED indoor lamp LED day Lantern Etc br 2 landscape lighting buildings road and bridge square building facilities Lawn Wall lights br 3 for backlighting mobile phones computers etc br 4 flat panel display and information display boards dynamic billboards simulation animation sports venues business and industry other industries br br 5 lights inside the automobile and the internal reading light outside the car Brake lights Taillight Turn lights side lights br br 6 application in specific fields Explosion proof lamps Mining production in the miner 39 s lamp etc br br LED is a LED diode characteristics which can only be one way power Usually LED brightness is proportional to the output current through the LED but the white LED in the high current saturation would occur a significant reduction in luminous efficiency or even failure the LED using the current rating can not exceed its specifications In addition LED light output with temperature is inversely proportional to so should minimize the use of well designed power supply heating and cooling system br br DC current LED drivers are and therefore required between the utility and added an LED Power adapter The LED drive power Its function is to convert AC electricity into DC right LED According to the electricity grid rules and LED drivers feature request selection and design of LED drive power to take into account the following br br 1 High reliability in this particular drive power LED street lamp mounted at a height convenient repair and maintenance cost is also large br br 2 LED is highly efficient energy saving products drive higher power efficiency For the power installed in the lamp inside the structure is particularly important Because DALI LED Driver efficiency of LED temperature increases with the decrease so LED 39 s heat is very important High efficiency power supply its small power loss heat within the lamp on the small thus reducing the lamp S rebound 6 turns leap ED favorable light failure br br 3 High Power Factor Power factor is the power of the load requirements 70 watts under normal use of electrical appliances there is no mandatory targets Although not a single power with a lower electrical power factor has little effect on the grid but at night we light a lamp the same load is too concentrated it will produce power more serious pollution 30 watts to 40 watts for the LED drive power it is said in the near future perhaps there is a certain power factor will be the target requirements br br 4 Driven approach now prevailing in two one is a constant voltage constant current source for multiple sources each current source separately to each channel LED power supply This approach combined flexible way LED failure will not affect the other LED 39 s work but the cost will be slightly higher The other is a direct constant current power supply LED series or parallel operation The advantage is lower cost but flexibility is poor but also to resolve a fault LED LED operation does not affect other issues Both forms co exist for some time Multi channel constant current output power supply cost and performance will improve Perhaps the main direction of the future br br 5 Anti surge protection LED surge capacity is relatively poor especially against reverse voltage capability Enhance this protection is also very important Some LED lights installed in the outdoors such as LED lights As the network load rejection and lightning induction Kai from the power system will invade a variety of surge surge can cause some damage to LED LED drive power should therefore inhibit the surge of the invasion to protect the LED from damage ability br br 6 Protection in addition to conventional power protection the best increase in the constant current output LED temperature feedback to prevent the LED temperature is too high br br 7 protection are outside mounted lamps power structure should be waterproof moisture cover to Fast br 8 drive power of life compared with induction lamp street light life fit br 9 to comply with safety regulations and electromagnetic compatibility requirements br br Lighting information and more exciting to do in