Welding Input Current Control for Power Source Overload Prevention

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional welding systems rely on operator knowledge to select power settings, often exceeding the capabilities of the power source, leading to issues like tripped breakers or overloads, as operators lack information about the power source's limitations.

Innovation Solution

The welding power system monitors and compares supply power inputs to predetermined thresholds, dynamically adjusting output power to prevent exceeding the power source's capabilities, using a user interface to restrict available settings and prevent overloads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the operator selects high power settings for welding, then the welding performance and productivity are improved, but the power source may be overloaded causing tripped breakers or equipment damage

Engineering Contradiction:

Improvewelding performanceVSAvoidpower source stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary monitoring of the input current magnitude before executing the welding program. The controller compares the measured current against the maximum current threshold in advance, and only permits program execution if the current is within safe limits. This prevents overload conditions before they occur, protecting the power source while allowing full welding performance when conditions are appropriate.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the primary input current magnitude during welding operations and provides feedback to the controller. When the current approaches or exceeds the maximum threshold, the system can interrupt the welding program or alert the operator, creating a closed-loop control system that maintains power source reliability while enabling high-performance welding when safe.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If the operator is given full control over power settings, then the ease of operation and flexibility are improved, but the risk of exceeding power source capabilities increases

Engineering Contradiction:

Improveoperator control flexibilityVSAvoidoverload risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The system dynamically changes the operational parameters by imposing a maximum current threshold based on the monitored input current magnitude. The controller adjusts the available power settings by preventing selection of programs that would exceed the calculated safe current limit. This maintains operator flexibility within safe boundaries while automatically protecting against harmful overload conditions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20220347782A1Systems and methods for control of primary input current in a welding program

Publication Date: 2022.11.03 ILLINOIS TOOL WORKS INC

AI summary

Disclosed example welding power systems and methods monitor supply power inputs from a primary power source. The supply power is compared to current and/or power threshold values corresponding to limits associated with the primary power source. If the supply power exceeds a threshold value associated with the limits, the welding power system controls welding parameters or devices to adjust a supply power demand, thereby ensuring the draw on supply power does not exceed the capabilities of the power source. In some examples, the disclosed welding power system presents a subset of welding parameters identified as available for operation based on the capabilities of the power source. The user interface displays only the subset of available welding parameters to an operator for selection, thereby ensuring the draw on supply power does not exceed the capabilities of the power source.