Welding Arc Ignition Energy Limiting for Electric Shock Prevention
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Solution Overview
Problem
Welding apparatuses lack effective safety measures to prevent excessive energy delivery during the ignition process, posing a risk of electric shock to users, as existing methods do not adequately limit energy input during ignition modes.
Innovation Solution
An energy limiting unit is introduced, which determines the amount of ignition energy within a defined time window, compares it to a predetermined energy limit value, and triggers an action to prevent further energy delivery if the limit is exceeded, ensuring safe operation by blocking low-voltage, high-voltage, or auxiliary voltage pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage pulses are used to ignite an arc during the ignition process, then the arc ignition capability is improved, but the risk of electric shock to users increases due to excessive energy delivery
Solution Approach 1:
The energy limiting unit is activated before the ignition process to pre-establish energy thresholds and monitoring parameters. By setting the energy limit value in advance and preparing the monitoring system, the patent prevents excessive energy delivery before it can occur, thereby eliminating the electric shock risk while maintaining reliable arc ignition capability.
Solution Approach 2:
The energy limiting unit continuously monitors the actual ignition energy in real-time and compares it against the predetermined energy limit value. When the monitored energy approaches or exceeds the limit, the system provides feedback to trigger an action that prevents further energy delivery, thus maintaining safety while allowing normal ignition operation.
2Object-affected harmful factors
If energy monitoring and limiting mechanisms are added to the welding apparatus, then user safety is improved, but the device complexity increases
Solution Approach 1:
The energy limiting unit is designed to perform multiple functions: monitoring ignition energy, comparing it against limit values, determining when limits are exceeded, and triggering preventive actions. By consolidating these safety functions into a single multi-functional unit rather than separate components, the patent improves user safety while minimizing the increase in device complexity.
Solution Approach 2:
The energy limiting unit autonomously monitors its own operational parameters and automatically triggers protective actions when energy limits are exceeded, without requiring external intervention or complex control systems. This self-service capability enhances safety while keeping the system structure relatively simple.
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 energy limiting unit effectively prevents excessive energy delivery during ignition modes, enhancing user safety by ensuring that the energy input does not exceed safe limits, thereby reducing the risk of electric shock.
Implementation Method 1
low-voltage pulses being transformed into high-voltage pulses, low-voltage source being designed to generate low-voltage pulses on the low-voltage side, transformation unit for converting the low-voltage pulses generated on the low-voltage side to high-voltage pulses at a high-voltage side
Data Source
AI summary
To ensure safe operation of a welding apparatus, low-voltage pulses occurring on a low-voltage side of the welding apparatus are transformed into high-voltage pulses occurring on a high-voltage side of the welding apparatus, an arc is ignited between an electrode and a workpiece during an ignition mode and/or idling mode using the high-voltage pulses, provision is made, in the ignition mode and/or in the idling mode, for a time window that extends from a starting time point to an end time point, an amount of ignition energy at the electrode is determined during the time window and compared with an energy limit value, and an action is triggered in the event of the energy limit value being exceeded, in order to prevent further high-voltage pulses in the time window.