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如何设计光敏电阻路灯？

如何设计光敏电阻路灯？

浏览：30次 | 提问时间： 07-29 05:59

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3个答案

深陷 07-29 05:59

光敏电阻的工作原理是基于内光电效应。在半导体光敏材料两端装上电极引线，将其封装在带有透明窗的管壳里就构成光敏电阻，为了增加灵敏度，两电极常做成梳状。用于*光敏电阻的材料主要是金属的硫化物、硒化物和碲化物等半导体。通常采用涂敷、喷涂、烧结等方法在绝缘衬底上制作很薄的光敏电阻体
及梳状欧姆电极，接出引线，封装在具有透光镜的密封壳体内，以免受潮影响其灵敏度。在黑暗环境里，它的电阻值很高，当受到光照时，只要光子能量大于半导体材料的禁带宽度，则价带中的*吸收一个光子的能量后可跃迁到导带，并在价带中产生一个带正电荷的空*，这种由光照产生的*—空*对了半导体材料中载流子的数目，使其电阻率变小，从而造成光敏电阻阻值下降。光照愈强，阻值愈低。入射光消失后，由光子激发产生的*—空*对将复合，光敏电阻的阻值也就恢复原值。在光敏电阻两端的金属电极加上电压，其中便有电流通过，受到波长的光线照射时，电流就会随光强的而变大，从而实现光电转换。光敏电阻没有极性，纯粹是一个电阻器件，使用时既可加直流电压，也加交流电压。半导体的导电能力取决于半导体导带内载流子数目的多少。

情愫 07-29 06:08

电路中整流桥给出的是必须是直流脉动电压，不能将其用电容滤波变成平滑直流电压，又可使电容C的充电在每个半周从零开始，准确完成对可控硅的同步移相触发。
以光敏电阻为核心元件的带继电器控制输出的光控开关电路有许多形式，如自锁亮激发、暗激发及精密亮激发、暗激发等等。

若离相惜 07-29 06:16

光敏电阻能承的最大电压可以达到上百伏，但是在你的问题里面没必要用这么大的电压。首先需要一个低压电源，但是你不想另外用低压电源，那就用一个全桥整流电路再加一个稳压模块，可以得到6V电压源。用光敏电阻和一个100K的可变电阻构成分压电路，再去控制三极管，再用三极管去控制继电器。100k的电阻搞成可变的有个好处就是可以调节控制光线的强弱。我现在还不能上图，要不电路图我也给你传上来好了。

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如何设计光敏电阻路灯？

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