Voltage-Controlled Welding Loop With Dynamic Slope for Short Circuits
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Solution Overview
Problem
Conventional gas metal arc welding (GMAW) systems experience high current levels during short circuit events, leading to increased spatter and energy consumption, which complicates the welding process and increases non-welding time.
Innovation Solution
A voltage-controlled control loop with a slope parameter is implemented to adjust the output voltage based on the current, reducing the voltage error and current response, thereby minimizing spatter and energy consumption during short circuit clearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GMAW systems operate with standard voltage control during short circuit events, then the welding process can clear short circuits, but high current levels are generated leading to increased spatter and energy consumption
Solution Approach 1:
The patent implements dynamic control of the voltage-controlled control loop by adjusting the slope parameter based on welding conditions. The slope parameter is modified during short circuit events to dynamically control current response, allowing the system to adaptively clear short circuits while minimizing energy consumption and spatter generation.
Solution Approach 2:
The patent changes the slope parameter of the voltage-controlled control loop to optimize short circuit clearing. By adjusting this parameter, the system modifies the relationship between voltage error and current response, enabling effective short circuit clearing at lower current levels and reduced energy consumption.
2Productivity
If conventional GMAW systems allow high current response during short circuit events, then short circuits can be cleared quickly, but spatter generation increases significantly
Solution Approach 1:
The patent modifies the slope parameter in the voltage-controlled control loop to change the current response characteristics. This parameter adjustment enables the system to clear short circuits effectively while controlling the rate of current increase, thereby reducing spatter generation without sacrificing clearing speed.
Solution Approach 2:
The voltage-controlled control loop continuously monitors voltage error and uses feedback to adjust current response. By incorporating feedback control with optimized slope parameters, the system responds appropriately to short circuit conditions while minimizing harmful spatter effects.
3Device complexity
If the voltage-controlled control loop uses a fixed slope parameter, then the control system remains simple, but it cannot optimize performance across different welding conditions
Solution Approach 1:
The patent implements a dynamic slope parameter that can be adjusted based on welding conditions while maintaining the simplicity of the voltage-controlled control loop architecture. This allows the system to adapt to different welding scenarios without requiring a completely complex control system.
Data Source
AI summary
An example welding-type power supply, includes: power conversion circuitry configured to convert input power to welding-type power; and control circuitry configured to: control the power conversion circuitry to output the welding-type power based on a voltage-controlled control loop; and in response to detecting an output voltage less than a threshold voltage: during a first state, control the voltage-controlled control loop based on a first value of a control parameter of the voltage-controlled control loop to increase a response rate of the voltage-controlled control loop; and during a second state following the first state, control the voltage-controlled control loop based on a second value of the control parameter, wherein the second value of the control parameter causes a reduction in energy output by the power conversion circuitry relative to the first state.