Welding Power Source Voltage Reduction Control Logic
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Solution Overview
Problem
Conventional welding power sources face challenges in safely reducing open circuit voltage due to complex and noise-prone control circuits, which are electrically demanding and prone to sensitivity issues.
Innovation Solution
A method and device that monitor resistive load and output voltage to generate logic signals for controlling the welding power source, enabling and disabling it based on defined logic to ensure safety by reducing voltage only when necessary, thereby preventing electrical shock in hazardous conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the conduction period of switching devices is reduced to lower open circuit voltage, then safety is improved, but the control circuit becomes more complicated and electrically demanding
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the conduction period of switching devices and adjusts it to maintain open circuit voltage below a predetermined threshold. This feedback loop enables automatic voltage regulation without requiring overly complex control logic, resolving the contradiction between safety improvement and circuit complexity.
Solution Approach 2:
The patent changes the conduction period parameter of switching devices dynamically based on operating conditions. By adjusting this single parameter, the system achieves voltage reduction for safety while avoiding the need for complex multi-parameter control circuits, thus resolving the technical contradiction.
2Reliability
If detection devices with releasing circuits are added to control power source, then voltage reduction control is improved, but noise and sensitivity problems increase
Solution Approach 1:
The patent extracts the essential detection function from complex releasing circuits and implements a simplified detection mechanism that monitors only the critical parameters (conduction period and open circuit voltage). This extraction approach maintains control reliability while eliminating the noise and sensitivity problems associated with complex releasing circuits.
Solution Approach 2:
The patent employs simple, robust detection components that are less susceptible to noise and sensitivity issues compared to complex releasing circuits. These simpler detection elements achieve the required reliability without introducing the harmful noise and sensitivity problems of more complex alternatives.
Data Source
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AI summary
Apparatus, devices, and methods for providing a voltage reduction capability in a welding power source (10) for safety purposes. The resistive load and the output voltage of the welding power source output are monitored and compared to predefined or preselected threshold values to generate a load condition signal and an output voltage condition signal (e.g., logic signals). The load condition signal and the output voltage condition signal serve as inputs to a voltage reduction device control logic (370) which generates control signals (372) to enable and disable the input and output of the welding power source according to the defined control logic. As a result, an extra measure of safety in preventing electrical shock is provided to users of the welding power source during hazardous operating conditions.