摘要：设计并实现了一种基于光电隔离器HCPL7840的电流传感器，该传感器采用一片高精度、低阻值的采样电阻采集大电流信号，然后通过HCPL7840及一系列运放，将之转为电压信号，该电压信号正比于采集的电流信号。实验表明该传感器具有较高的精度，适用于一些需要采集大电流信号的场合。
关键词：光电隔离放大器；采样；电流；电压

Abstract: This thesis designed a kind of current sensor based on optical isolators HCPL7840, which used a high precision, lowresistance sampling resistor. Through the HCPL7840 and a series of opamp, the current signal can be converted  into voltage, the voltage signal is proportional to the collected current. Experiments show that the sensor has high accuracy for some  currentsampling occasions.
Key words: isolation Amplifier；sampling；current；voltage