自己做的led培训资料大全（Do your own led training materials Daquan）.docVIP

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自己做的led培训资料大全（Do your own led training materials Daquan）.doc

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自己做的led培训资料大全（Do your own led training materials Daquan） Do led training Sourcebook.Txt37 genuine wine, the longer the year more mellow thick; sincere is the fireworks, blooms in the high place beautiful flowers; sincere, send to people, there is hand. This article is contributed by lxianghua_ok Pdf documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. LED lighting training materials Technology Department, October 20, 2010 Led profile LED basic knowledge, 1, LED basic knowledge, 2, LED light source characteristics, LED light source characteristics, 3, lighting terms, 4, electrical characteristics I. Basic knowledge of LED What is led? LED is taken from Light Emitting Diode three Chinese acronym, translated as led, as the name suggests is a light emitting diode can convert electrical energy to light the characteristics of electronic devices with diode. I. Basic knowledge of LED LED luminescence principle The core part of the LED is a wafer consisting of type P semiconductors and type N semiconductors. There is a transition layer between the P type semiconductor and the N type semiconductor, called the p-n junction. In some PN junctions of semiconductor materials, the injected minority carriers combine with the majority carriers to release excess energy in the form of light, thereby converting the electric energy directly into light energy. PN junction plus reverse voltage, the minority carrier is difficult to inject, so it does not emit light. I. Basic knowledge of LED Two, LED light source features Voltage: LED uses low voltage power supplies, a single voltage between 1.9-4V, safer than using high-voltage power supplies. Efficiency: the luminous efficiency is high. The highest luminous efficiency has reached 161 lm/w (Cree) at present. It is the most effective lighting product at present. Seismic resistance: LED is a solid state light source. Because of its particularity, i