ACPL-790线性光耦是一款强电隔离性线性光耦放大器，他是怎么实现双向电流检测并放大的，尤其是输入端的双向电流检测两端电位甚至比供电电源电位还要低，这是怎么实现的？
还有就是这款芯片通常用在强电中，而输出端是弱电，怎么能够实现如此强的电压隔离，是什么技术原理？
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