LED lighting low voltage drive technology

Web Design And Seo For www.china-webdesign.com

led wall lights - China Manufacturer

Thank you for inquiry my led wall lights, Tel:+86-574-87641051 E-MAIL:sales@everlightings.com

http://www.everlites.com/led-wall-lights/

LED light source technology matures, the rapid growth of per-watt light-emitting lumen led gradually decline to lower prices. 1W led high bay lighting light source for example, the spring of 2008, the price is one-third of the price in the spring of 2006, the spring of 2009, dropped to fourth in 2006.

LED green lighting the mass market and a steady growing demand will be the IC industry, the consumer electronics market, super VCD, DVD, mobile phones, MP3, after tsunami!

LED lamps of high-energy, long life, the environmental benefits of the superior performance of generally recognized.

LED High energy: energy-saving energy is clean and is environmentally friendly. DC drive, ultra-low power consumption (single tube 0.03 W -1 watt) electro-optical power conversion close to 100%, the same lighting effects than traditional energy sources more than 80%.

Long-life LED: LED light source is known as the longevity light. Solid cold light source, epoxy encapsulated, light body and no loose parts, does not exist filament light easy to burn, heat deposition, the light fades and fast drawbac k life of up to 50000-100000 hours longer life than traditional light sources 10 times.

LED environmental benefits: LED is a green light, and the environmental benefits of better. No ultraviolet and infrared spectra, low in calories and no flicker, no radiation, and waste recycling, no pollution, no mercury element, cold light source, is safe to touch, is a typical green lighting.

Lighting is very low VF voltage of the LED light source, generally the VF = 2.75-3.8V, IF 15-1400mA; therefore the output voltage of the LED driver IC VF × N or VF × 1 IF constant current in 15-1400mA.LED lamps use LED light source has low power (IF = 15-20mA) and high power (IF> 200mA)) of two kinds of low-power LEDs are usually used to do LED fluorescent lamp, decorative lights, grille; high-power LED is used to do family lights, spotlights, underwater lights, wall wash lights, street lamps, tunnel lights, car work lights and so on. The power LED light source is a low voltage, high current driven device, the luminous intensity determined by the size of the flow through the LED current, current is too strong will cause attenuation of the LED light, LED luminous intensity of the current is too weak will, therefore, LED The driver needs to provide constant current power supply to ensure that the safety of using high-power LED to achieve the desired luminous intensity. In the field of LED lighting to reflect the characteristics of energy saving and long life, choose a good LED driver IC is essential, there is no good driver IC match not reflect the advantages of LED lighting.

The main parameters of the LED work elements LED VF, IF, the other is the color / color temperature / wavelength / brightness / light-emitting angle / efficiency / power consumption. The LED is a PN junction diode, only exert enough forward voltage to conduct current. VF forward voltage of the LED light to establish a normal working condition, IF the forward current is to promote LED light, LED brightness and the flow of current is proportional to the cases. LED VF nominal voltage: 3.4V ± 0.2V LED the IF work current according to application demands, the file can not be mixed.

High-power illumination LED High Power Lighting LED package from the finished look is a single chip, in fact, is the N pieces of LED die is encapsulated in an organization. Their permutation and combination series-parallel, they are N-series, and then N parallel, and then by two points connected power supply (Figure 1). Pay special attention to the selection of the VF and IF.

LED lighting driving principle of LED lighting drivers need to first high-voltage AC transform into a low-voltage alternating current (AC / AC), then the low-voltage AC power into low voltage direct current (AC / DC) transform by the bridge rectifier and then through high-efficiency DC / DC switching regulator buck and transforms into a constant cu rrent source, a constant output current drive LED light source. The LED light source lighting design requirements for low-power or high-power LED strings and more, and which consists of. The string IF current is designed according to the selected LED light source, IF, the total forward voltage â–³ VF is the sum of the N LED s. LED lamp driving principle shown in Figure 2. LED lamps selection below 36V AC power can be considered non-isolated power supply, such as the use of 220V and 100V AC power should consider the isolated power supply.

LED lighting, low voltage driving MR11, MR16 spotlights, underwater lights, wall wash lights, street lamps, tunnel lights, car work lights such as LED lamps are mostly selected heat better comes with copper-based or aluminum plate 1W, 3W high power LED light source, the use of AC/DC12-36V power, and thus need to use the DC / DC step-down (Buck) + constant current to the LED provide VF and IF.LED of lamps mostly use low-voltage pow er supply, so the circuit design of these lamps, led rope lighting the series number of 1-9 stars, especially the 1-3 stars common. Total â–³ VF series should be less than the power supply Vin. Such as three LED series, â–³ VF = 3.4V × 3 = 10.2V Vin> 12V, to work properly. MR11, MR16 spotlights common 1W × 3 series or 3W × 1; underwater lamp is 1W × 3 series 2-3 and a set of three; common wall washer is 1W × 7-9 series; street lights Common 1W × 9 series 3 and, 4 - 6 a group; common automotive work lights 1W-3-6 series 3 and Of course, LED series and parallel programs are diverse, the serial number and its operating voltage (Vin), where the DC12-36V operating voltage. The current 1W LED light source heat better, so use more.