In this work, we demonstrate a load resistance measurement system aimed at automating a vibration type capacitive energy harvester using a CdS analog linear optical coupler as a variable resistor. The CdS variable resistor exhibits non-polar, very low parasitic capacitance below picofarad and high allowable voltage over a wide range of variable resistance. By controlling a LED driving current of the CdS analog coupler, variable resistance range of 10 MΩ to 100 kΩ was obtained by 0.4 µA to 6 µA driving current. The results show that the resistance is reproducible at full scale with a low error rate of less than +3%. The detailed characteristics of the CdS coupler and the automated measurement results of the piezoelectric MEMS vibration energy harvester by using Arduino microcontroller are also described.

在这项工作中，我们演示了一种负载电阻测量系统，该系统旨在使用CdS模拟线性光耦合器作为可变电阻器来使振动型电容式能量收集器自动化。CdS可变电阻器表现出无极性，低于皮法拉的极低寄生电容，以及在很宽的可变电阻范围内的高允许电压。通过控制CdS模拟耦合器的LED驱动电流，通过0.4 µA至6 µA的驱动电流可获得10MΩ至100kΩ的可变电阻范围。结果表明，该电阻是可再现的，误差率小于+ 3％。还描述了CdS耦合器的详细特性以及使用Arduino微控制器对压电MEMS振动能量采集器的自动测量结果。