Welding Power Cutoff Control Using Time-Delay Current Sensing
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Solution Overview
Problem
Conventional welding power control systems fail to completely disconnect power to welding equipment when idle, leading to energy waste and safety risks, while existing solutions do not effectively manage power based on current flow during welding operations.
Innovation Solution
A system incorporating a time delay relay and magnetic switch to disconnect power when welding stops and reconnect when the welding gun is tapped against a workpiece, using a control device to manage power flow based on current sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If welding equipment power is reduced when idle, then energy consumption is decreased, but power is not completely disconnected leading to continued energy waste and safety risks
Solution Approach 1:
The patent extracts the power disconnection function from conventional reduction-based systems by implementing a complete power disconnection mechanism through a relay switch that fully isolates the welding equipment from the power source during idle periods, eliminating both energy waste and safety hazards simultaneously
Solution Approach 2:
The system employs automatic detection circuits that sense welding current flow and autonomously control the relay switch to disconnect or connect power without operator intervention, making the system self-regulating based on actual welding activity
2Reliability
If welding equipment remains powered continuously, then safety and readiness are maintained, but substantial excess energy costs are incurred
Solution Approach 1:
The patent transforms the static continuous power supply into a dynamic system that automatically adjusts power delivery based on welding activity detection, disconnecting during idle periods and reconnecting when welding current is detected, thereby maintaining readiness while reducing energy consumption
Solution Approach 2:
The system incorporates feedback mechanisms through current sensing circuits that monitor welding activity and provide signals to the control relay, creating a closed-loop system that responds to actual welding needs and eliminates unnecessary power consumption
3Loss of energy
If power is reduced but not disconnected during idle periods, then some energy savings are achieved, but the equipment continues to consume power at a reduced level
Solution Approach 1:
The patent replaces complex continuous power regulation mechanisms with a simple binary on/off control system using a relay switch that completely disconnects power during idle periods, achieving greater energy savings with simpler control logic
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 solution conserves energy, reduces costs, and enhances safety by fully disconnecting power during idle periods and reconnecting it when needed, optimizing power usage and reducing wastage.
Implementation Method 1
The control device includes a time delay relay that measures a predetermined time period
Implementation Method 2
A system incorporating a time delay relay and magnetic switch to disconnect power when welding stops and reconnect when the welding gun is tapped against a workpiece
Data Source
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AI summary
An apparatus is disclosed. The apparatus has a power supply, a control device connected to the power supply, a welding device selectively connected to the power supply via the control device, and a switch connected between the control device and the welding device. The control device includes a time delay relay that measures a predetermined time period. The switch maintains a closed position when the predetermined time period expires and the welding device is producing a welding arc. The switch switches from the closed position to an open position when the predetermined time period expires and the welding device stops producing the welding arc. The control device transfers current from the power supply to the welding device when the switch is in the closed position, and blocks current from the power supply to the welding device when the switch is in the open position.