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本工作中研制了一种用微机直接控制的恒电位阴极保护电源.其基本原理完全不同于现有恒电位仪的反馈控制。它定时对阴极电位采样,根据与给定值的偏差,通过可变比例控制算法,调整可控硅电源的输出电压,并保持这一输出电压直至下一次采样。在这种控制方式下,除电位采样和控制算法以外的大部份时间内,微机处于“闲置”工作状态,并且参比电极与控制系统无关.这样的保护电源可望方便地扩展到多通道巡回控制,用单一电源对多阳极系统实施恒电位阴极保护。
In this work, a constant-potential cathodic protection power source with direct control by a microcomputer has been developed, whose basic principle is completely different from the feedback control of the existing potentiostat. It periodically samples the cathode potential and adjusts the output voltage of the thyristor power supply according to the deviation from the given value through a variable ratio control algorithm and maintains this output voltage until the next sampling. In this control mode, except for the potential sampling and control algorithm for most of the time, the microcomputer is in “idle” working condition, and the reference electrode has nothing to do with the control system. Such protection power is expected to be easily extended to multi-channel Tour control, with a single power supply to the multi-anode system to implement constant potential cathodic protection.