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LED lamp. Teacher:Ru-Li Lin Students:Yuan-Yu Liu Kai-Meng Zeng Department of Mechanical Engineering Southern Taiwan University of Science and Technology. Outline. LED lamp introduce LED lamp Technology overview LED lamp drive circuit LED lamp Application
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LEDlamp Teacher:Ru-Li Lin Students:Yuan-Yu Liu Kai-Meng Zeng Department of Mechanical Engineering Southern Taiwan University of Science and Technology
Outline LED lamp introduce LED lamp Technology overview LED lamp drive circuit LED lamp Application Household LED lamps Comparison of the lamp LED Specs Taiwan bulb market Reference
LED lamp introduce AnLED lamp(orLEDlight bulb) is asolid-state lampthat useslight-emitting diodes(LEDs) as the source of light
LED lamp Technology overview General-purpose lighting needs white light. LEDs emit light in a very small band of wavelengths, emitting light of a color characteristic of the energyband gapof thesemicon ductormaterial used to make the LED. To emit white light from LEDs requires either mixing light from red, green, and blue LEDs, or using aphosphorto convert some of the light to other colors.
LED lamp drive circuit LED is a low-voltage semiconductor products, high voltage can cause damage, not directly from a standard AC drive, the need for additional circuitry to control the voltage and current supply.
The Advantages and Disadvantages of each connection • Series connection Advntages：Equal currents, LED brightness is consistent. Disadvantages：An LED broken all LEDs do not work. • Parallel connection Advntages：An LED broken does not affect other LED work. Disadvantages：LED driver needs a larger current to the output. • A mixture of series and parallel Advntages：Combines the advantages of the series and parallel Disadvantages：The design is very complex
Household LED lamps A selection of consumer LED bulbs available as drop-in replacements for incandescent bulbs in screw-type sockets
Comparison of the lamp Incandescent light bulbs Krypton bulb
Comparison of the lamp HID bulb LED bulb
Brightness comparison and Power consumption Brightness comparison HID > LED > Incandescent light bulbs > Krypton bulb Power consumption HID > Incandescent light bulb> Krypton bulb> LED
LED Specs • Lumen：luminous flux, a measure of the total "amount" ofvisible lightemitted by a source. • Watt(W)：defined as one joule per second, measures the rate of energy conversion or transfer. • Luminousefficacy：Is a parameter of the light source. The ratio of the luminous flux and power
High-wattage≠high-brightness High luminous efficiency, the higher the number of lumens per watt of electricity is higher c / p value.
Taiwan bulb market • Taiwan bulb market currently saving light bulbs mainstream, the most power-hungry incandescent bulbs each less than one percent market share and most energy efficient LED bulbs, LED bulbs and more local lighting and create an atmosphere. • Same brightness, for example six hundred to eight hundred lumens.60-watt incandescent bulb power consumption, energy saving bulbs significantly reduced to 12 watts power consumption, LED only nine watts
Reference http://homelight.iproducts.com.tw/ledlamps.html http://home.educities.edu.tw/jmhwang/newsfile/article030610.htm http://udn.com/NEWS/LIFE/LIF1/6284415.shtml http://en.wikipedia.org/wiki/Wiki http://www.everlightlighting.com/