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常见三种LED调光电源分析 发布日期：2020-04-15 11:29:12浏览量：1314 1、LED可控硅调光电源 可控硅调光较早之前就应用于白炽灯和节能灯调光方式，也是目前应用于LED调光最为广范的一种调光方式。它的工作原理是将输入电压的波形通过导通角切波之后，产生一个切向的输出电压波形。应用切向的原理，可减少输出电压的有效值，以此来降低普通负载(电阻负载)的功率。可控硅调光的优点在于工作效率较高，性能稳定。 2、LED 0/1-10V调光电源 电源设计带有控制芯片，接0-10V调光器时，通过0-10V电压变化，改变电源输出电流，降光.例如：当0-10V调光器调制到0V时，电流降到到了0，其灯光亮度也就是关闭状态(有个开关作用)，当0-10V调光器调大最大10V时，输出电流也将达到电源输出的100%，亮度也将100%.(输出电压是不变的). 1-10V调光原理：如上所说明，只是调光器是1-10V：当电阻调光器调到最小1V时，改变输出的电流也是10%，如到10V时(调到最大)，输出电流也将达到电源输出的100%，亮度也将100%.(输出电压是不变的).备注：1-10V是没有开关功能，不能将灯具调到最低关闭作用！ 3、PWM调光电源 数字调光又称PWM调光，通过PWM波开启和关闭LED来改变正向电流的导通时间，以达到亮度调节的效果。该方法基于人眼对亮度闪烁不够敏感的特性，使负载LED时亮时暗。 如果亮暗的频率超过100Hz，人眼看到的就是平均亮度，而不是LED在闪烁。PWM通过调节亮和暗的时间比例实现调节亮度，在一个PWM周期内，因为人眼对大于100Hz内的光闪烁，感知的亮度是一个累积过程，即亮的时间在整个周期中所占得比例越大，人眼感觉越亮。但是对于一些高频采样的设备，如高频采样摄像头，采样时有可能恰好采到LED暗时的图像。因此本文将模拟和数字相结合，设计了LED的驱动电路。 上一页：LED发展简介 |
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