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led调光面板灯怎么设置

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led调光面板灯怎么设置

浏览：49次 | 提问时间： 08-10 08:49

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3个答案

一个人唱分手快乐 08-10 08:50

采用调光技术，降低输出功率，将显着改善LED面板灯的工作环境，延长灯具寿命，提高可靠性。影响LED面板灯可靠性的关键因素是温度。无论是LED驱动电源还是LED芯片，环境温度越高，其寿命和可靠性会急剧下降。当环境温度为25℃时LED电源寿命高达320,000小时，而当温度上升至60℃时，LED面板灯电源的寿命将缩短至只有35,000小时。，温度越高，LED芯片的光衰也明显加剧。LED的光衰和它的结温有密切的关系，所谓结温就是半导体PN结的温度，结温越高，LED光源越早出现光衰，也就是寿命越短。假如结温为105℃，亮度降至70%的LED面板灯寿命只有一万多小时；结温95℃时LED面板灯寿命就有2万小时；而结温降低到75℃，寿命就可长达到5万小时，65℃时寿命更可以延长至9万小时。综上所述，延长LED面板灯寿命的关键就是要降低结温。采用调光技术，随着输出功率地降低，驱动电源自身损耗也将降低，其壳温也将同时下降。当环境温度为25℃满载输出时，外壳温度为50℃，而采用调光技术控制输出只有50%功率时，其外壳温度下降至40℃，寿命也将翻倍，可靠性可提高25%-40%.

你蠢 08-10 08:58

您好，方法：第一种：这种调光方法为通过调制LED驱动电流来完成LED灯的调光，由于LED芯片的亮度与LED驱动电流成一定的比例干系，所以我们调节LED驱动电流就可以控制LED灯的明暗。第二种：这种调光方法被称为模仿调光方法或线性调光方法。该种调光方法的好处是：当驱动电流线性增长或减小时，减小了驱动电流过冲过程中对LED芯片寿命的影响，而且调光电路的抗滋扰性较强。其缺陷则是驱动电流的大小变化过程肯定对LED芯片的色温有一定的影响。第三种：这种调光方法称之为脉冲宽度调制(PWM)。该种方法是经过调节使驱动电流呈方波状，其脉冲宽度可变，经过对脉冲宽度的调制转变为调制LED灯连续点亮的时间，也同时转变了输入功率，从而到达节能、调光的目标。频率跟平常一样大概在200Hz~10KHz;因为人的眼睛视觉的滞后性，不会感觉得到光源在调光过程中产生的闪耀现象。此种调光方法的好处是能改善LED的散热性能，缺陷是驱动电流的过冲对LED芯片的寿命肯定有一定的影响。

一纸南城梦 08-10 09:06

那个是起调点   电压   不足引起的      正常   有些灯   在   关闭   转   打开时   需要一个比较高的电压   但是   一旦打开了   只需要个比较低的电压就可以维持了            比如说   一个灯   正常工作是   5v电压         从0-5v的时候   到   3v   灯才亮      低于   3v灯就不亮         但是如果灯亮了以后      你   把电压   调回到2v   灯也不灭      直到   调回到   1v的时候   灯才灭   。

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