Gradient Fuse Bridge Layout for Higher Open-State Resistance
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Solution Overview
Problem
Legacy fuse designs experience uniform melting and arcing during high current faults, leading to potential current leakage due to uniform distribution of melted copper between terminals, which contradicts the purpose of fuses in preventing current flow.
Innovation Solution
The design incorporates a gradient bridge cross-section where bridges closest to the center have the smallest quantity of electrically conductive material, increasing sequentially towards the terminals, causing bridges to arc and melt in a sequential order, dispersing copper further into the filler and creating a region of high resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridges have uniform quantity of electrically conductive material, then manufacturing is simpler, but open-state resistance decreases due to uniform melting and arcing creating current leakage paths
Solution Approach 1:
The patent applies local quality by varying the quantity of electrically conductive material in bridges based on their position. Bridges closer to the center have less material while those near terminals have more material. This non-uniform distribution creates sequential arcing from center outward, preventing uniform copper distribution and maintaining high open-state resistance.
Solution Approach 2:
The patent implements asymmetry by creating a gradient bridge cross-section where bridges are intentionally designed with different quantities of electrically conductive material. This asymmetric design breaks the symmetry of uniform melting and arcing, forcing arcing to occur sequentially from the center toward the terminals, thereby preventing current leakage paths.
2Reliability
If all bridges burn simultaneously, then fuse operation is faster, but current leakage occurs due to uniform copper distribution between terminals
Solution Approach 1:
By making bridges non-uniform with varying material quantities based on position, the patent ensures that bridges closer to the center (with less material) arc and melt first, followed by bridges progressively farther away. This local quality variation creates sequential arcing that prevents uniform copper distribution and the resulting current leakage paths.
Solution Approach 2:
The patent creates a periodic or sequential arcing pattern where bridges arc and melt in a specific time sequence rather than simultaneously. The first bridge arcs and melts, then the second bridge arcs and melts, and so on. This periodic action ensures copper is dispersed progressively from center to terminals, maintaining high resistance and preventing current leakage.
3Reliability
If bridges have gradient cross-section, then arcing is forced to occur sequentially improving open-state resistance, but manufacturing precision requirements increase
Solution Approach 1:
The patent requires manufacturing precision to achieve local quality variation in bridges. Each bridge must have a specific quantity of electrically conductive material corresponding to its position in the gradient. This controlled variation ensures sequential arcing while being manufacturable through precision control of material deposition or forming processes.
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 design enhances open-state resistance by minimizing the chances of arcing through the end of the fuse, forcing most arcing to take place in the center, thereby maintaining high resistance and preventing current leakage.
Implementation Method 1
a first bridge of the bridge assembly arcs, then melts into a first melted copper deposit
Implementation Method 2
a first bridge of the bridge assembly arcs, then melts into a first melted copper deposit
Implementation Method 3
In a second time period, a second bridge of the bridge assembly arcs, then melts into a second melted copper deposit having a second area. The first bridge is closer to the center portion than the second bridge and the first time period is before the second time period.
Data Source
AI summary
A fuse element includes a bridge assembly located adjacent one side of a center portion. The bridge assembly includes multiple bridges connected to a fuse terminal. Each bridge has a cross-sectional area different from each other bridge. A first bridge is adjacent the center portion and has a first cross-sectional area. A last bridge is adjacent the fuse terminal and has a second cross-sectional area greater than the first cross-sectional area.