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光敏电阻设计要求有哪些？

光敏电阻设计要求有哪些？

浏览：27次 | 提问时间： 07-30 09:50

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小时光不用点缀也华丽 07-30 09:50

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。

逃不出生活 07-30 09:59

光敏电阻器一般用于光的测量、光的控制和光电转换（将光的变化转换为电的变化）。常用的光敏电阻器硫化镉光敏电阻器，它是由半导体材料制成的。光敏电阻器对光的敏感性（即光谱特性）与人眼对可见光（0.4~0.76）μm的响应很接近，只要人眼可感受的光，都会引起它的阻值变化。设计光控电路时，都用白炽灯泡（小电珠）光线或自然光线作控制光源，使设计大为简化。光敏电阻器通常由光敏层、玻璃基片（或树脂防潮膜）和电极等组成。光敏电阻器在电路中用字母“R”或“RL”、“RG”表示光敏电阻常用硫化镉（CdS）制成。它分为环氧树脂封装和金属封装两款，同属于导线型（DIP型），环氧树脂封装光敏电阻按陶瓷基板直径分为￠3mm、￠4mm、￠5mm、￠7mm、￠11mm、￠12mm、￠20mm、￠25mm 。

月亮女王 07-30 10:07

直接把光敏电阻串在电路里显然很不科学，因为这个电路实际应用的话必须考虑光敏电阻的功耗和发热。简单的做法是用光敏电阻和一个定值电阻构成分压电路，后面接一个比较器。比较器的输出接三极管或者继电器或者接触器（这个要看你的灯是什么样的，LED？白炽灯？还要看你的电压是多少，1.5V？5V？220V？）

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