Anti-shock Device for High-Frequency Welding Arc Suppression
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Solution Overview
Problem
Existing anti-shock devices for high-frequency electronic welding machines require high-power transformers and have slow intervention times, leading to potential damage from electrical discharges between mold holding electrodes, especially in high-power welding machines without insulators.
Innovation Solution
An anti-shock device with a control unit connected to a discharge sensor that rapidly compares resistance values and sends signals to a triode locking unit, utilizing bipolar transistors and a voltage doubler rectifier bridge to apply a negative voltage to the grid, effectively blocking triode conduction within microseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a known anti-shock device uses a power supply with a battery of capacitors and diodes to generate locking voltage, then the triode can be blocked to prevent discharges, but the system requires high-power transformers and has slow intervention times
Solution Approach 1:
The invention extracts and isolates the grid resistance from the main power supply system, creating a separate, dedicated power supply unit specifically for generating the locking voltage. This separation allows the locking voltage generation to be optimized independently from the main oscillator power requirements, enabling faster response times without compromising the main system's power capacity.
Solution Approach 2:
The power supply system is segmented into two independent parts: the main power supply for the oscillator and a separate, dedicated power supply for the grid resistance. This segmentation allows each subsystem to be optimized for its specific function, with the grid power supply being sized appropriately for fast locking voltage generation rather than requiring the full power capacity of the main transformer.
2Reliability
If the power supply for the anti-shock device is dimensioned to handle high power welding machines with small resistance, then adequate locking voltage can be supplied, but the transformer size and system complexity increase
Solution Approach 1:
The grid resistance power supply is extracted as a separate, independent unit from the main oscillator power supply. This dedicated power supply is dimensioned specifically for the much smaller power requirements of the grid locking function, rather than requiring the main transformer to be oversized to handle both the high-power oscillator and the locking voltage generation simultaneously.
Solution Approach 2:
The power supply system is divided into two independent segments: the main high-power supply for the oscillator and a separate low-power supply dedicated to the grid resistance. This segmentation allows the grid power supply to be compact and simple, while the main transformer handles only the oscillator power requirements without being unnecessarily oversized.
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 enables quick intervention to prevent electrical discharges, reducing wear and damage, and is implemented with lower costs and simpler design, ensuring rapid and effective arc suppression.
Implementation Method 1
a transformer which powers a voltage doubler rectifier bridge which in turn powers a battery of capacitors
Implementation Method 2
The locking voltage in fact creates a potential barrier on the negative control electrode so that the electrons are repelled rather than attracted, blocking the triode conduction
Data Source
Figure 1
Figure 2
AI summary
Anti-shock device for high-frequency welding machines configured to intervene in a much quicker way, when the resistance between the molds of the welding press reaches a value lower than a predetermined value, so as to open the supply circuit of the triode grid and lock the latter, to avoid the formation of arcs or discharges between the molds.