LED lighting can not be ignored technical details-LED, lighting, lamps – Lighting industry by hi joiney
led Lighting In the recent development by leaps, led as green Environmental protection Clean light source is widely recognized. led light long life, energy saving, application easy to use, low cost, so the family will receive a flood lighting applications, OSRAM optical semiconductor company survey in 2008, global annual shipments of approximately home lighting lamp 50000000000. led light source technology has matured, LED lumens per watt rapid growth, diminishing year by year to promote its price cut. To 1Wled light source, for example, the spring of 2008, the price is the price of one-third of the spring of 2006, spring 2009 to fall 2006 quarter. led green light for mass market and a steady growth in demand for several years following the IC industry, VCD, DVD, mobile phone, MP3 consumption after Electronic Super market tsunami! led lamps High-energy, long life, superior performance benefits of environmental protection were widely recognized. led high energy: DC drive, ultra-low power (0.03 W -1 watt single tube) electro-optical power conversion close to 100%, the same light energy than traditional lighting effect more than 80%. led a long life: led lamp light source is known as longevity. Solid cold light source, epoxy resin, light body and no loose parts, does not exist Filament Light easy to burn, heat deposition, the light fades fast and other shortcomings, the service life of up 50,000 to 100,000 hours, longer life than conventional light sources more than 10 times. Lee Green led: led is a kind of green light, better environmental benefits. Ultraviolet and infrared spectra are not low in calories and no strobe, no radiation, and recyclable waste, no pollution, no mercury elements, cold light source, safe touch, typical of green lighting. Features work light led lighting led light sources VF voltage are very low, VF = 2.75-3.8V, IF in the 15-1400mA; thus led driver IC output voltage is VFXN or VFX1, IF constant in the 15-1400mA.led led lamp light source using a small power (IF = 15-20mA) and High Power (IF> 200mA)) two small power led to do more led fluorescent lamp, Decorative lights, Grid lamps; power used for home lighting led lights, spotlights, underwater lights, wall lights, street lamps, tunnel lights, Car Work lights. Power led light source is low voltage, high current drive of the device, the luminous intensity of the current flowing through led the size of the decision, the current is too strong can cause attenuation of the light led, led the current is too weak will affect the luminous intensity, therefore, led the need to provide constant current drive Power Supply To guarantee the safety of using high-power led, while the desired luminous intensity. Led lighting in the area, to reflect the characteristics of energy saving and long life, choose a good led driver IC is essential, not a good driver IC of the match, led the advantages of lighting can not be reflected. led lighting design requires attention to technical details
Led light on the low-voltage driver IC requirements:
1, drive nominal input voltage range of chips should meet DC8-40V, to cover the application area of need, if voltage greater than 45V better; AC12V or 24V inputs simple bridge rectifier output voltage varies with Power voltage fluctuation, especially at high voltage DC output voltage will be high, such as driver IC can not meet the wide voltage range, often in the grid will be the breakdown voltage increases, led light source and therefore destroyed.
2, driver chips required is greater than the nominal output current 1.2-1.5A, as the lighting of the led light source, 1W power led light work of its nominal current of 350mA, 3W power led light of its nominal operating current to 700mA, the power of community needs more current, so lighting led driver IC selected must have sufficient current output, designed to make driver IC products need to work at full negative output of 70-90% of the best work area. Using the full negative output current driver IC cooling small spaces in poor lighting, easy fatigue and early failure.
3, driver IC output current necessary for a long time constant, led to stable light source, light will not flash; the same number of driver chips used under the same conditions, the size of the output current should be as consistent as possible, that is, smaller discrete, so that high-volume automated production line can be effective and orderly; for certain discrete output current drive chip must-production line at the factory or before the sub-file, adjust the PCB, the current setting resistor (Rs) of resistance size, so that production led lamps led constant current driver board on the same line brightness light source to maintain the consistency of the final product.
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