Welding Power Supply Pulse Control for Open-Circuit RMS Limits
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Solution Overview
Problem
Power supplies for welding and related equipment face challenges in maintaining output levels within predefined limits due to varying load conditions and open circuit voltage (OCV) changes, which can lead to improper operation and non-compliance with industrial standards.
Innovation Solution
A welding-type system with a controller that monitors and adjusts the pulsed output signal of a power supply to maintain an RMS value within a predetermined threshold, detects OCV conditions, and adjusts the pulse interval or frequency to ensure compliance with industrial standards, using a switched mode power supply and sense voltage circuit to manage power distribution between a welding torch and wire feeder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply provides high voltage output to drive welding equipment, then the power supply can meet the high power requirements of welding operations, but the output voltage may exceed predefined safety limits under open circuit conditions
Solution Approach 1:
The power supply uses pulsed output signals instead of continuous high voltage, switching between on and off states at controlled frequencies to deliver power during welding while limiting average voltage exposure during open circuit conditions
Solution Approach 2:
The controller dynamically adjusts pulsed output parameters including frequency, duty cycle, and voltage levels based on load detection, transitioning between high power delivery mode and safety limitation mode depending on whether welding equipment is actively connected
2Adaptability or versatility
If the power supply adjusts output dynamically to accommodate varying load conditions, then the power supply can optimize performance for different welding operations, but the output level may fluctuate outside predefined limits
Solution Approach 1:
The system continuously monitors output conditions and load status, using feedback signals to adjust pulsed output parameters in real-time, ensuring output remains within predefined limits while adapting to different welding requirements
Solution Approach 2:
The power supply employs dynamic parameter adjustment where pulse frequency, duty cycle, and voltage levels are continuously modified based on detected load conditions, enabling seamless transition between different welding modes while maintaining safety compliance
3Object-affected harmful factors
If the power supply uses pulsed output to limit RMS voltage during open circuit conditions, then safety limits can be maintained, but the wire feeder may not receive sufficient power for proper operation
Solution Approach 1:
The pulsed output delivers concentrated power bursts during the on-periods that provide sufficient energy to the wire feeder during active welding, while the off-periods reduce average RMS voltage to safety limits during open circuit conditions
Solution Approach 2:
The system adjusts pulsed output parameters including increasing voltage and duty cycle during detected load conditions to ensure adequate wire feeder power, while reducing these parameters during open circuit conditions to maintain safety compliance
Data Source
AI summary
A welding-type system includes a wire feeder to provide an electrode wire to a welding-type torch. A welding-type power supply to provide power to one or both of the welding-type torch or the wire feeder. A controller is configured to control a sense voltage circuit to provide a sense voltage to charge a control capacitor, monitor a voltage feedback signal, determine that a wire feeder is activated based on a first change in the voltage feedback signal, control the switched mode power supply to provide a constant voltage output signal during a welding operation, control the switched mode power supply to provide the pulsed power output in response to completion of the welding operation, determine that the wire feeder is deactivated based on a second change in the feedback signal, adjust a pulse rate of the output signal to achieve an RMS value below a predetermined RMS level.