Welding Circuit Inductance Compensation for Accurate Arc Voltage
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Solution Overview
Problem
Accurate measurement of arc voltage in welding processes is challenging due to inductive voltage drops caused by resistance and inductance in the welding circuit, especially in remote measurements, leading to inaccuracies and the need for complex and costly solutions.
Innovation Solution
Implementing an inductance-compensation feedback loop that measures arc voltage pulses, cancels inductive voltage drops using a canceling voltage, and derives this voltage based on the compensated arc voltage pulse to produce a more accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external sense cables are used to measure arc voltage near the arc, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the inductive voltage drop component from the total measured voltage signal and removes it through compensation. By separating and eliminating the harmful inductive component, the system achieves accurate arc voltage measurement using existing sense cables without requiring additional external sense cables or complex sensor arrangements.
Solution Approach 2:
The patent implements a feedback mechanism where the measured voltage signal is processed to identify and compensate for inductive voltage drops. The compensation signal is derived from the measured signal itself and fed back to correct the measurement, enabling precise arc voltage determination without additional hardware complexity.
2Measurement precision
If external sense cables are used to measure arc voltage near the arc, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the inductive voltage drop component from the measurement signal through compensation circuitry. This approach avoids the need for expensive external sense cables while achieving accurate measurement, thereby reducing manufacturing cost while maintaining measurement precision.
Solution Approach 2:
The patent creates a compensation signal that replicates the inductive voltage drop characteristics and uses it to correct the measured signal. This signal-based approach replaces the need for expensive physical sense cables with an economical electronic compensation mechanism.
3Ease of operation
If arc voltage is measured remotely at the power supply, then ease of operation is improved, but measurement precision deteriorates due to resistance and inductance
Solution Approach 1:
The patent implements a feedback compensation mechanism that processes the remotely measured voltage signal to eliminate the effects of circuit resistance and inductance. By continuously monitoring and compensating for these voltage drops, the system maintains high measurement accuracy while preserving the convenience of remote measurement at the power supply.
Solution Approach 2:
The patent changes the measurement parameters by compensating for resistance and inductance effects in real-time. Through mathematical compensation based on measured current and known circuit parameters, the system converts the remotely measured voltage into an accurate representation of actual arc voltage, maintaining precision despite remote measurement location.
4Measurement precision
If inductance compensation is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the inductive voltage drop component from the total measured signal and removes it through compensation. By isolating and eliminating only the harmful inductive component rather than redesigning the entire measurement system, the patent achieves high measurement accuracy with minimal added circuit complexity.
Solution Approach 2:
The patent introduces a compensation signal as an intermediary element that mediates between the measured voltage signal and the final compensated output. This intermediary compensation signal, derived from the measured signal itself, simplifies the overall circuit architecture while achieving precise measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides continuous and accurate compensation for inductive voltage drops, improving the precision of arc voltage measurement without the need for additional sensors or complex setups, ensuring stable and reliable welding operations.
Implementation Method 1
Arc welding processes involve forming an electric arc between an electrode of a welding torch and a workpiece to deliver energy to the welding site
Implementation Method 2
measuring an arc voltage to produce a measured arc voltage pulse that includes an inductive voltage drop due to inductance in the welding circuit
Data Source
AI summary
A method comprises: providing a welding current pulse through a welding circuit to create an arc for a welding operation; measuring an arc voltage to produce a measured arc voltage pulse that includes an inductive voltage drop due to inductance in the welding circuit and current ramps of the welding current pulse; and during the welding operation, implementing an inductance-compensation feedback loop. The feedback loop includes canceling the inductive voltage drop from the measured arc voltage pulse using a canceling voltage to produce a compensated arc voltage pulse; and deriving the canceling voltage based on the compensated arc voltage pulse.