Pyro-Fuse and Melting Fuse Layout for Faster Arc Extinction
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Solution Overview
Problem
Existing shutdown devices generate arcs when a melting fuse is fused, leading to insufficient protection of the electric circuit.
Innovation Solution
A shutdown device with a pyro-fuse and a melting fuse, where the melting fuse includes a fuse case, a fuse element, and arc-extinguishing material in a granular phase, and the fuse element extends intersecting the piston's movement direction, combined with an abnormality detection device to efficiently extinguish arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a melting fuse is used to protect the power supply path, then overcurrent protection is provided, but arc generation occurs when the fuse element is fused
Solution Approach 1:
The patent introduces arc-extinguishing material as an intermediary substance between the fuse element and the surrounding environment. When the fuse element fuses and generates an arc, this material acts as a mediator to suppress and extinguish the arc, preventing it from causing harm to the electric circuit while maintaining the overcurrent protection function.
Solution Approach 2:
The patent converts the harmful arc generation into a beneficial process by using the arc itself to ignite the arc-extinguishing material. The arc, instead of remaining uncontrolled and harmful, serves to activate the extinguishing material which then suppresses the arc, transforming a dangerous byproduct into a useful mechanism for circuit protection.
2Object-generated harmful factors
If arc-extinguishing material is added to the fuse case, then arc extinction is improved, but device complexity increases
Solution Approach 1:
The patent employs arc-extinguishing material in granular or porous form within the fuse case. This material provides numerous surfaces for arc attachment and extinction, effectively suppressing arc generation through its physical structure rather than requiring complex mechanical or electronic components, thus achieving arc extinction with minimal increase in device complexity.
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 efficiently extinguishes arcs in the melting fuse, ensuring faster arc extinction and effective shutdown even under severe conditions.
Implementation Method 1
the pyro-fuse of the shutdown device is ignited based on the shutdown signal output from the abnormality detection device to move the piston toward the bus bar, and divides the bus bar
Implementation Method 2
a fuse element provided in the fuse case and is fused when an overcurrent flows
Implementation Method 3
generation of an arc (arc discharge) in the pyro-fuse is suppressed
Implementation Method 4
an arc-extinguishing material provided in the fuse case and being in a granular phase
Data Source
AI summary
A shutdown device includes: a pyro-fuse that includes a bus bar inserted into a power supply path and a piston disposed above the bus bar, the piston moving toward the bus bar to divide the bus bar; and a melting fuse connected in parallel to the pyro-fuse, in which the melting fuse includes a fuse case, a fuse element provided in the fuse case and is fused when an overcurrent flows, and an arc-extinguishing material provided in the fuse case and being in a granular phase, and the fuse element extends along a direction intersecting a direction in which the piston moves.