Weld Circuit Communication for Remote Arc Voltage Compensation
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Solution Overview
Problem
Welding applications often require long welding power cables, leading to significant voltage drops between the power source and the workpiece, which complicates achieving accurate weld voltages without additional communication cables or unreliable wireless equipment.
Innovation Solution
The system uses weld cable communications to enable a voltage sensing wire feeder that communicates arc voltage feedback to the power supply via the weld circuit, allowing the power supply to adjust the arc voltage and compensate for voltage drops in the weld cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If long welding power cables are used to extend the welding location far from the power source, then the welding accessibility and working range are improved, but the voltage drop in the cable increases leading to inaccurate weld voltages
Solution Approach 1:
The wire feeder measures the actual arc voltage and communicates this feedback to the power supply via the weld cable. The power supply uses this feedback to calculate the voltage drop in the cable and adjust its output to compensate, ensuring accurate weld voltages despite long cable lengths
Solution Approach 2:
The system dynamically changes the power supply output parameters (voltage and current) based on the measured arc voltage and calculated cable voltage drop, adjusting these parameters in real-time to maintain accurate weld voltage at the welding location
2Measurement precision
If additional communication cables are added to enable voltage feedback from the wire feeder to the power supply, then the voltage compensation accuracy is improved, but the system complexity and cable management difficulty increase
Solution Approach 1:
The weld cable serves dual functions: it carries both the welding current and the communication signals for voltage feedback. By making the communication system universal with the power cable, no additional cables are needed, reducing system complexity while maintaining voltage compensation accuracy
Solution Approach 2:
The system merges the power transmission function and communication function into a single weld cable. The communication signals are superimposed on the weld cable, combining multiple functions into one component to simplify the overall system
3Device complexity
If wireless communication equipment is used to transmit voltage feedback from the wire feeder to the power supply, then the system complexity is reduced, but the reliability decreases in the harsh weld environment
Solution Approach 1:
The weld cable acts as an intermediary medium that is already present in the system, carrying both power and communication signals. This intermediary approach avoids introducing new wireless equipment that would be vulnerable to the harsh welding environment, maintaining reliability while reducing complexity
4Adaptability or versatility
If the wire feeder is positioned far from the power supply, then the welding location flexibility is improved, but the voltage drop and communication reliability worsen
Solution Approach 1:
The real-time voltage feedback mechanism allows the power supply to continuously monitor and compensate for voltage drops regardless of distance. This feedback loop maintains compensation reliability even when the wire feeder is positioned far from the power supply, supporting greater welding location flexibility
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 approach provides more predictable and reliable weld voltages by compensating for voltage drops in real-time, eliminating the need for additional communication cables and reducing the complexity and hazards associated with long weld cables.
Implementation Method 1
a weld circuit to output the welding-type power; a receiver circuit to receive a communication via the weld circuit while current is flowing through the weld circuit or after the current has stopped flowing through the weld circuit
Data Source
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AI summary
Disclosed example welding-type power supplies include: a power converter; a receiver circuit configured to receive weld voltage feedback information measured at a device remote from the power supply while current is flowing through a weld circuit; and a controller configured to: for an initial weld performed with a weld circuit element: determine an estimated weld circuit resistance value based on a characteristic of the weld circuit element; and control the power converter according to a voltage feedback loop based on the estimated weld circuit resistance value; and for a subsequent weld performed with the weld circuit element: determine a measured weld circuit resistance value based on the weld voltage feedback information; and control the power converter according to a voltage feedback loop based on the measured weld circuit resistance value to regulate a weld voltage at the remote device to the weld voltage setpoint.