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NTC determination

  1. 2011/09/10(土) 12:48:09|
  2. 精彩美文|
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 The radiation management is in the new LED lamp is most difficult, the request to be strictest, and cost highest design part. If does not carry on the full radiation management, will cause the illumination to expire or fire and so on disastrous the consequences.customer satisfies
However, the LED lamp's radiation management is in the entire design proposal is most complex, the request to be strictest, and cost highest part. How will this article discuss implements the negative temperature coefficient (NTC) radiation management, by enhances the LED design fully the security and reduces the power loss largely.


in the tradition's incandescent lamp bulb, with anything immediate contact's filament is not the only heat source. But speaking of the LED lamp, LED is the photo source, the LED radiation contacts directly with the LED light bulb. This kind of immediate contact is makes to cause to so LED and the driver electric circuit's connection mode. In order to realize the radiation,improvement management
must releases the quantity of heat from LED and in the driver electric circuit or performs the effective management, simultaneously this is also lets the LED lamp maintains the long lasting work the basic premise.


  For the understanding radiation management's importance, we might as well conceive this kind of kind of application, in the wall lamp or hangs the dome light and so in the general light socket to substitute installs the LED lamp, and controls the LED lamp with the wall switch.work lacks
Because the wall lamp either hangs the dome light and so on majority standard lamp's radiation main dependence heat convections or the air current realizes, therefore this kind of application's radiation effect speaking of the LED lamp is not too ideal.


if does not carry on the effective radiation management, will then bring the LED lamp which needs to replace frequently expires or causes building fire and so on disastrous the consequences. The use intelligence LED lamp control function monitors the LED lamp's temperature is the simpler radiation policing method, simultaneously as a result of the LED lamp can in the temperature increment situation drop low power, therefore the security will also obtain the large promotion.


the NTC radiation manages the NTC electric circuit's basic principle is through monitors the LED lamp's temperature to promote the LED lamp's security and to reduce the design order of complexity. When temperature increment, the controller reduces the lumen and in order to maintains in LED the safety level. In other words, when temperature increment, reduces the lumen, otherwise,news raised
when temperature drop, then increases the lumen.


The NTC electric circuit's basic principle is through monitors the LED lamp's temperature to promote the LED lamp's security and to reduce the design order of complexity.


When temperature increment, controller reduce the lumen and in order to maintain in LED the safety level. In other words, when temperature increment, reduces the lumen, otherwise, when temperature drop, then increases the lumen. we may through examine on NTC the voltage to examine the LED lamp's temperature change. Examines the voltage and the NTC temperature has the direct relation,哮喘 but the NTC resistance elevates along with NTC and the peripheral electric circuit temperature drops.


Uses the NTC determination temperature to have two essential methods. method one: Uses NTC in the system compulsion implementation known voltage's bleeder chain, and surveys in the NTC node afterward the voltage. When NTC temperature increment, the resistance reduces. The resistance will reduce will cause the voltage divider ratio the change.


The NTC node's voltage will also drop along with temperature increment. the method two, compulsion known electric currents through NTC, and survey on NTC the voltage. When NTC temperature increment, the resistance reduces. According to the ohm's law, the resistance will reduce will change in the NTC node the voltage. If the resistance reduces, but the electric current maintains invariable, in the NTC node's voltage will also drop.


speaking of the improvement operation, enhances the security, these two kinds monitor the LED lamp temperature the method to implement are very simple directly. Figure 1 is uses the LED achievement to elevate temperature the source these two method schematic diagram.   


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