Welding DC-DC Converter Stand-By Switching for Clean Arc Start
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Solution Overview
Problem
Existing DC-to-DC converters in welding devices experience significant energy losses during stand-by phases due to continuous operation at normal switching frequencies, which can lead to a decrease in output DC voltage and hinder a clean and immediate start of the welding process.
Innovation Solution
Implementing a stand-by phase with a reduced switching frequency for the switch elements, maintaining the output DC voltage at a sufficient level for device operation and reducing energy losses by switching the elements with a stand-by switching frequency lower than the normal frequency during stand-by phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the switch element operates at normal switching frequency during stand-by phase, then the output DC voltage is maintained at sufficient level, but significant energy losses occur
Solution Approach 1:
The patent applies dynamics by making the switching frequency adjustable based on operational phase. The control unit dynamically switches between normal switching frequency during welding phases and reduced switching frequency during stand-by phases, allowing the system to adapt its characteristics to current operational requirements and minimize energy losses while maintaining voltage stability when needed
Solution Approach 2:
The patent changes the switching frequency parameter from a fixed normal frequency to a variable parameter that can be reduced during stand-by phases. This parameter change allows the DC-to-DC converter to operate more efficiently during low-demand periods while maintaining sufficient output voltage through the reduced but non-zero switching frequency
2Loss of energy
If the switch element is deactivated during stand-by phase, then energy losses are reduced, but the output DC voltage decreases and welding start is delayed
Solution Approach 1:
The patent applies preliminary action by maintaining a reduced switching frequency during stand-by phase that is sufficient to keep the output DC voltage at a ready level. This preliminary maintenance of voltage readiness ensures that when welding is requested, the system can start immediately without delay, as the voltage is already prepared at the appropriate level
Solution Approach 2:
The patent uses periodic action by continuing to switch the element at a reduced frequency during stand-by phase rather than deactivating it completely. This periodic switching maintains the energy transfer and voltage regulation necessary for immediate welding start while significantly reducing energy consumption compared to continuous normal-frequency operation
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 approach minimizes energy losses during stand-by phases, ensures a stable output DC voltage for device functionality, and allows for an immediate and controlled start of the welding process without voltage drops.
Implementation Method 1
DC-to-DC converters convert an input DC voltage at an input side into an output DC voltage at an output side
Data Source
AI summary
To reduce energy losses for a welding device when on stand-by and to enable a clean and controlled start of the welding phase, a DC-to-DC converter of the welding device converts an input DC voltage present at an input connection to an output DC voltage present at an output connection. At least one switch element of a branch of the DC-to-DC converter is switched with a switching frequency, and a welding phase is provided for the welding device, during which the switching frequency corresponds to a normal switching frequency. A stand-by phase is provided for the welding device, during which the at least one switch element is switched with a switching frequency corresponding to a stand-by switching frequency which is lower than the normal switching frequency.