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1前言在微机广泛应用于工业检测和工业控制过程中，由于现场条件的不同，使得传输到微机控制柜的现场信号带有相当高的共模电压。此电压可高达数百伏，影响了系统的正常工作，更重要的是被检测的主电路信号与适应微机系统自动化要求的模拟信号之间没有相应的隔离保护措施，常常
1 Introduction Microcomputer is widely used in industrial testing and industrial control process, due to the different field conditions, making the transmission to the computer control cabinet signal with a very high common-mode voltage. This voltage can be as high as several hundred volts, affecting the normal operation of the system, more importantly, there is no corresponding isolation protection between the detected main circuit signal and the analog signal adapted to the automation requirements of the microcomputer system, and often