Welding Power Supply Stray Current Detection Using Temperature
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Solution Overview
Problem
Stray welding currents, which occur when the weld circuit is completed through unintended conductive paths, can cause damage to equipment, premature wear, and poor welding conditions, as operators may not be aware of their presence.
Innovation Solution
The system detects stray welding currents using temperature measurements, wireless current sniffers, and by comparing actual and expected welding output power, and responds with alerts, output limitations, or disabling the power supply to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature measurements are used to detect stray welding currents, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent uses temperature as an intermediary parameter to indirectly detect stray welding currents. Instead of directly measuring the stray current, the system measures the temperature rise in components caused by the stray current flow, which then triggers detection and protection mechanisms.
2Reliability
If multiple detection methods (temperature measurements, wireless current sniffers, output comparison) are implemented, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The detection system is divided into multiple independent detection channels: temperature measurement channel, wireless current sniffer channel, and output power comparison channel. Each channel independently monitors for stray currents using different methods, and any detection triggers the protection mechanism, providing redundant and reliable detection.
3Object-affected harmful factors
If the system disables power supply output upon detecting stray currents, then equipment protection is improved, but productivity decreases
Solution Approach 1:
The system applies preliminary anti-action by detecting stray welding currents and disabling the power supply output before the stray currents can cause significant equipment damage. This preventive approach protects equipment by stopping the harmful current flow at its source.
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
The system effectively identifies and mitigates stray welding currents, preventing equipment damage and ensuring proper welding conditions by providing timely alerts and control measures.
Implementation Method 1
a first temperature sensor configured to measure a temperature of the at least one component
Data Source
AI summary
An example welding-type power supply includes: power conversion circuitry configured to convert input power to welding-type power, and to output the welding-type power via a welding-type circuit; a temperature sensor configured to measure a temperature of at least one component of the welding-type power supply; and stray current detection circuitry configured to detect stray welding-type current based on the measured temperature of the at least one component.