Three-Electrode Power Cut-Off for Fast Arc Diversion
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Solution Overview
Problem
Existing electrical devices struggle to efficiently interrupt high-intensity electric currents with fast reaction times and maintain reliability across varying current intensities, including low or zero current conditions, often requiring complex modifications to circuit breakers.
Innovation Solution
An electrical device comprising a body with three electrodes, where current flows between specific electrodes based on predefined threshold values, utilizing a fuse element or deformable conductor to divert current when exceeding thresholds, ensuring rapid interruption and preventing premature fuse aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse is connected in parallel with a pyrotechnic circuit breaker to ensure complete current interruption, then the breaking performance is improved, but the fuse undergoes premature aging due to permanent current flow
Solution Approach 1:
The patent introduces a controlling device that activates before a fault occurs, establishing a high-impedance state in the fuse branch. This preliminary action prevents permanent current flow through the fuse during normal operation, thereby extending fuse lifespan while maintaining the parallel configuration needed for complete current interruption during faults.
Solution Approach 2:
The patent employs a dynamic switching mechanism controlled by a controllable source. The impedance of the fuse branch is dynamically changed from high (during normal operation) to low (during fault conditions), allowing the system to adapt its behavior based on operational state. This dynamic control resolves the contradiction by preventing fuse aging during normal operation while ensuring proper current interruption during faults.
2Duration of action of stationary object
If the fuse is protected from permanent current flow by controlling connection timing, then fuse lifespan is extended, but the device complexity increases
Solution Approach 1:
The patent makes the controllable source multi-functional by having it serve both as a normal operating power source and as a fault detection and control mechanism. This universal approach allows the system to extend fuse lifespan without adding dedicated separate components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the controllable source monitors system conditions and automatically adjusts the impedance state of the fuse branch accordingly. This feedback control enables the system to respond to fault conditions and extend fuse lifespan without requiring complex manual control systems or additional sensing components.
3Ease of manufacture
If known devices are used, then manufacturing is simpler, but the circuit cannot be opened when currents are low or zero
Solution Approach 1:
The patent introduces a third electrode as an intermediary element that enables current interruption even when currents are low or zero. This intermediary electrode works in conjunction with the controllable source to create a controlled discharge path, allowing the device to handle a broader range of current conditions without requiring complex modifications to the basic pyrotechnic circuit breaker structure.
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
The device effectively diverts high-intensity electric arcs, extends fuse lifespan, and enhances system reliability by preventing permanent current flow through the fuse, allowing rapid circuit opening even at low currents.
Implementation Method 1
the fuse element being configured for melting when the current flowing through the fuse element exceeds said threshold value
Implementation Method 2
the device includes a deformable conductor shape memory element connecting the first electrode to the second electrode, the conductor element being configured for deforming and breaking the electrical contact between the first electrode and the second electrode when the current flowing therethrough exceeds said threshold value
Implementation Method 3
the breakdown voltage between the second electrode and the first electrode being lower than the breakdown voltage between the second electrode and the third electrode
Data Source
AI summary
Electrical device comprising a body defining a closed inner space, a first electrode, a second electrode and a third electrode, a free end of each electrode opening inside the inner space, the free ends of each electrode being arranged, inside the inner space, apart from one another and opposite the other electrodes, the electrical device being configured to prohibit the current from flowing between the first electrode and the third electrode when the electric current or the electric voltage between the first electrode and the second electrode remains below a predefined threshold value; when the electric current or the electric voltage exceeds the threshold value, allow the current to flow between the first electrode and the third electrode.