摘要:
所研制的Z-80单板微处理机控制的晶体管弧焊电源,由于将计算机引入"QH-ARC焊接电弧控制法",所以只要改变软件程序,就能获得不同的特性.本文列出了系统的硬件结构简图,分别介绍了自行扩展的接口电路元件的某些性能及其逻辑电路,如A/D、D/A转换器、PIO、电子开关等。论述了系统各环节放大倍数的设计方法,讨论了测量环节A/D元件的"转换当量"对系统精度的影响.利用了采样周期T=100μs的非线性离散控制.介绍了带门限值的P、PI离散调节方案,以及恒流、恒压、双阶梯形静态外特性的实验结果.结果表明,在恒值调节系统中,可获得误差为±1 bit的静态精度及满意的动态品质.它使弧焊电源的控制更加精确、灵活,是实现焊接过程高水平自动化的重要途径。
Abstract:
A welding power source controlled by Z-80 single-board microcomputer has been developed.A computer was introduced into the QH-ARC welding arc control system.Various types of desirable characteristics may be obtained by only changing the software.In this paper the hardware diagram and the features of extended interfaces were carefully briefed,such as A/D and D/A convertors,PIO,electronic switch and some logic circuits.The design method of the gain in some blocks is given,and the effect of "converse equivalence" on system accuracy is discussed.In the nonlinear discrete control,a sampling period T=100μs is adopted.The P and PI regulation with threshold and the experimental results of constant voltage,constant current and dual-step static characteristics are described.The results show that ±1bit static accuracy and satisfactory dynamic response can be obtained with the constant value regulation system.This enables the power source control to be more accurate and versatile.Doubtlessly,this system should be n effective means of realizing the fully automatic welding process.
百度学术
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