 Wysłany: Wto 2:56, 19 Kwi 2011 Temat postu: Detection of light-emitting diode with a multimete |
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| Led while product standards and testing methods can not be in the product development, but the product standards and testing methods should be followed as much as possible the progress of product design and development, writing board because the development of standards and testing methods for product development process itself is summary of discussions and review process, as long as basic conditions mature, product standards and develop more timely detection methods, the more they can reduce the product development process of blindness.
because the negative resistance characteristics of led heat, so a simple constant voltage circuit (eg, switching power supply) can not be used as led drive circuit. figure 1 volt-ampere characteristic curve of led modules for lighting characteristics, iec iec 62384:2006 iso published standards, led neon sign the national standardization technical committee lighting for completion in 2008 the drafting of the standard, for approval of the draft for approval to retain not only the entire contents of the iec 62384, also increased the energy efficiency of led control devicerequirements. that the output from the control device to see inside, with a very low output resistance. because the led signs has a prominent "negative resistance temperature characteristics", that is, when the led work, along with junction junction temperature increases. |
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