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