Software Compensation Method of Integral Drift for Resistance Welding Current Signal

RONG Aiqiong; ZENG Jiaquan

doi:10.7512/j.issn.1001-2303.2024.06.05

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Software Compensation Method of Integral Drift for Resistance Welding Current Signal
Vol. 54, Issue 6, Pages: 25-29(2024)
Received：04 December 2023，

Revised：2023-12-24，

Published：25 June 2024
DOI： 10.7512/j.issn.1001-2303.2024.06.05
稿件说明：

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容爱琼，曾家铨.电阻焊电流信号积分漂移软件补偿方法［J］.电焊机，2024，54（6）：25-29. DOI： 10.7512/j.issn.1001-2303.2024.06.05.

RONG Aiqiong, ZENG Jiaquan.Software Compensation Method of Integral Drift for Resistance Welding Current Signal[J].Electric Welding Machine, 2024, 54(6): 25-29. DOI： 10.7512/j.issn.1001-2303.2024.06.05.

摘要

为满足电阻焊电流长时间检测的需求并简化检测电路，针对罗氏线圈信号调理的积分漂移问题，探讨了基于软件补偿的漂移补偿方法。采用多款国产运算放大器构建积分器，在恒电流控制模式下检测积分器输出信号的漂移率，在数据处理过程中叠加漂移率的平均值以实现软件补偿。将积分漂移电压视为电流检测的误差，以相对误差分析了恒电流输出2 s过程中软件补偿的准确性。结果表明，基于软件补偿的漂移补偿方法在信号检测后进行数据修正，减少了对硬件补偿的依赖，在1~4 kA的被测电流范围内相对误差的平均值不超过1.0 %，能够满足电阻焊电流长时间检测需求。该补偿方法丰富了基于罗氏线圈的电流信号处理手段，具有较好的工程适用性。

Abstract

In order to meet the requirements for long-time detection of resistance welding current and simplify the detection circuit

a drift compensation method based on software compensation was explored to address the integral drift problem in the signal conditioning when Rogowski coils were used. Several domestically produced operational amplifiers were used to construct integrators

and the drift rate of the integrator output signal was detected in constant current control mode. The average drift rate was superimposed during data processing to achieve software compensation. The integral drift voltage was treated as an error in current detection

and the accuracy of software compensation during the 2 second process of constant current output was analyzed using relative error. The results show that the drift compensation method based on software compensation performs data correction after signal detection

reducing the dependence on hardware compensation. The average relative error within the measured current range of 1~4 kA does not exceed 1.0%

which can meet the requirements of long-time detection of resistance welding current. This compensation method enriches the current signal processing methods based on Rogowski coils and has good engineering applicability.

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Keywords

references

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