22kV高压隔离光电耦合器的研制

Design of 22kV High voltage Isolation Optocoupler

摘要:

针对高压隔离光电耦合器的隔离电压提高到22kV后信号传输特性恶化的问题，提出了在光源和探测器间引入导光管结构的方法，利用导光管的聚光特性弥补间距增大导致的探测器对光源发散角的降低，使探测器接收到足够的光功率，以保证器件的信号传输特性满足要求。对探测器接收光功率占光源光功率的比例进行了对比计算，结果表明，使用导光管的22kV高压隔离光电耦合器可获得与10kV产品相当的信号传输特性，通过样品的制作与测试验证了该计算结果，表明上述方法可行。

Abstract:

In order to solve the problem of signal transmission deterioration of high voltage isolation optocoupler when the isolation voltage rises to 22kV, a method of adding light pipe between the light source and the detector is put forward. The decrement of detectors divergence angle to the light source caused from spacing increase will be compensated with the light gathering ability of light pipe, making the detector receives enough optical power to meet requirement of signal transmission. Contrastive calculations for the ratio of receiving optical power to the light source optical power show that, 22kV high voltage isolation optocouplers with light pipe can get equal signal transmission characteristic compared to 10kV devices. Test results validate the calculation results and the feasibility of the method.