Switching Device Semiconductor Segmentation for Arc Control
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Solution Overview
Problem
Current switching devices for low or medium voltage electric power distribution networks face challenges with synchronization of movable contacts due to the large number of small power diodes required, leading to micro-arcs and reduced operating life, which complicates manufacturing and increases costs.
Innovation Solution
The switching device employs a chain of solid-state semiconductor devices configured in series with intermediate terminals to control current flow direction, allowing for improved synchronization and reduced parasitic phenomena during opening and closing maneuvers by activating different groups of semiconductor devices at specific positions, thus minimizing micro-arcs and inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a large number of small power diodes are used to handle high operating voltages, then the voltage handling capability is improved, but the synchronization of movable contacts becomes difficult and micro-arcs increase
Solution Approach 1:
The patent divides the single auxiliary current path into multiple parallel auxiliary current paths, each with its own semiconductor devices. This segmentation allows independent control and synchronization of each path, reducing the overall synchronization complexity while maintaining high voltage handling capability through the combined effect of multiple paths.
Solution Approach 2:
The patent introduces intermediate terminals that act as mediators between the main current path and multiple auxiliary current paths. These intermediaries facilitate coordinated control and synchronization of current flow across different paths, enabling precise timing control to prevent micro-arcs during contact opening.
2Reliability
If a large number of power diodes are employed to withstand high operating voltages, then the voltage resistance is improved, but the manufacturing complexity and costs increase
Solution Approach 1:
By segmenting the auxiliary current paths and using intermediate terminals, the patent enables modular manufacturing approaches. Each auxiliary path can be manufactured and tested independently, then assembled into the complete switching device, reducing overall manufacturing complexity and cost while maintaining high voltage resistance.
3Duration of action of stationary object
If micro-arcs are reduced through better synchronization, then the operating life of electric contacts is improved, but the device complexity increases
Solution Approach 1:
The patent segments the synchronization control into independent units for each auxiliary current path. This allows simpler, more reliable synchronization circuits that can be independently optimized, reducing the overall complexity while effectively preventing micro-arcs and extending contact operating life.
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 configuration enhances commutation efficiency, reduces parasitic phenomena, and simplifies manufacturing, resulting in a more robust and cost-effective switching device for low or medium voltage networks.
Implementation Method 1
each electric pole is provided with a number of semiconductor devices (typically power diodes) configured to allow the passage of currents flowing according to a predetermined direction only
Data Source
AI summary
A switching device for low or medium voltage electric power distribution networks, the switching device comprising: at least an electric pole comprising a movable contact and a fixed contact, which are coupleable/decoupleable one to another; a circuit assembly, which comprises a chain of semiconductor devices adapted to switch in an ON state or in an OFF state depending on the voltage applied thereto, the semiconductor devices being electrically connected in series one to another in such a way that a current can flow according to a predefined conduction direction (CD) when the semiconductor devices are in an ON state. The circuit assembly comprises an input terminal, an output terminal and at least an intermediate terminal electrically connected with at least an intermediate electric node positioned between two subsequent semiconductor devices. The input terminal is electrically connected with the fixed contact: the input terminal, the output terminal and the at least an intermediate terminal are electrically coupleable/decoupleable with/from the movable contact when the movable contact reaches different positions during a movement towards/away from the fixed contact in such a way that different groups of semiconductor devices switch in an ON state or in an OFF state at different instants during the movement of the movable contact, depending on the position reached by the movable contact.