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UFO Forum
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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>adz213r5x</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/Boyz/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Fri 3:27, 01 Apr 2011<span class="gen"> </span> Post subject: Exactly Why Businesses Ought To Use Custom Signs</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Led which are generally led chip (device) production commercial use of rapid detection methods, but with the practical application of led lighting in the final state of reference do not haveto.the second detection method is the detection of the led module is installed on the device, it may take a fixed heat sink (temperature control may also have the base function), to exert its claim to the work of the led current, the traditional light source detection methods, <a href="http://www.flashingboards.com/" target="_blank" class="postlink">writing board</a> until the led is in thermal equilibrium and then start measuring its optical parameters. this approach appears tighter, but in fact. <br />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, <a href="http://www.flashingboards.com/" target="_blank" class="postlink">led neon sign</a> 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. <br />the end of the forward voltage will be increased linearly, so the output voltage stable led control devices applies only to their own devices with a limited flow of led modules (at leastone current limiting resistor), or for larger power led lighting is not work. figure 3 control the output voltage of the <a href="http://www.flashingboards.com/" target="_blank" class="postlink">led signs</a> controller test circuit led control device if you do not have a stable output voltage, that is, when the load changes in the nominal range or power supply voltage rating lusm10% in the range of changes, the output voltage will a range of significant change.</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/Boyz/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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