Fuse-Assisted Circuit Cut-Off for Fast Arc Extinction
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Solution Overview
Problem
Existing electric circuit cut-off devices struggle to effectively and quickly extinguish arcs generated after the circuit is cut off, especially with increasing voltage and current levels in automotive systems.
Innovation Solution
The device incorporates a fuse with an arc-extinguishing material and a moving body that cuts a to-be-cut part, ensuring the current is guided to the fuse before the arc is generated, allowing for effective and quick arc extinction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc-extinguishing material is enclosed around the to-be-cut part in the housing, then arc extinction effectiveness is improved, but the amount of arc-extinguishing material that can be enclosed is limited due to housing space constraints
Solution Approach 1:
The patent extracts the arc-extinguishing function from the main housing space by introducing a dedicated fuse structure with its own arc-extinguishing material chamber. The fuse is connected to the to-be-cut part through electrode parts, allowing arc extinction material to be positioned closer to the arc generation point without occupying excessive housing space. This separates the arc extinction function into a dedicated component (fuse) that can be optimized independently.
Solution Approach 2:
The fuse acts as an intermediary component between the to-be-cut part and the housing. It includes electrode parts that connect to the to-be-cut part and an arc-extinguishing material chamber that contains the extinction material. This intermediary structure enables effective arc extinction while managing space constraints within the housing.
2Speed
If the moving body cuts the to-be-cut part directly, then circuit cut-off speed is improved, but arc generation may damage the device due to lack of pre-guided current path
Solution Approach 1:
The patent implements preliminary action by establishing a current guidance path through electrode parts and a fuse before the actual cutting occurs. When the moving body approaches the to-be-cut part, the electrode parts make contact first, creating a controlled current path through the fuse. Only after this preliminary connection is established does the moving body proceed to cut the to-be-cut part, ensuring the arc is immediately directed to the fuse for extinction.
Solution Approach 2:
The patent converts the potentially harmful arc generation into a beneficial process by directing it through the fuse. The arc that would normally damage the device is instead channeled through the fuse's arc-extinguishing material, which is designed to safely extinguish arcs. The harmful arc energy is transformed into a controlled extinction process within the fuse chamber.
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 ensures safe and effective cut-off of the electric circuit by reliably guiding fault current to the fuse, where it is quickly extinguished, preventing damage to the device and ensuring safe operation.
Implementation Method 1
a fuse (700) including a fusing portion (740) and an arc-extinguishing material (730)... the arc generated by the guided current can be effectively and quickly extinguished in the fuse (700)
Implementation Method 2
the moving body (500) is configured such that a part of the moving body (500) cuts a cut piece (420) located between base pieces (430) on both sides of the to-be-cut part (400)
Implementation Method 3
the moving body (500) moves in the housing between the first end portion and a second end portion on a side opposite to the first end portion, where the moving body (500) is moved by the power source (P) from the first end portion toward the second end portion
Data Source
AI summary
An electric circuit cut-off device including a housing, a to-be-cut part, a power source, and a moving body that moves between first and second end portions on opposite sides, a fuse including a fusing portion and an arc-extinguishing material, and a pair of electrode parts connected to terminals on both sides of the fuse. The moving body is configured to cut a piece located between base pieces on both sides of the to-be-cut part and a part of the to-be-cut part and the electrode part come into contact with each other in a state where base pieces on both sides of the to-be-cut part are energized via the cut piece, and the to-be-cut part and the fuse are connected to each other; and thereafter a state in which the base pieces on both sides of the to-be-cut part are energized via the cut piece is cut off.