Meltable Fuse Structure With Hollow Layer Layout for Fast Blowing
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Solution Overview
Problem
Existing protection devices face issues with the precise control of the covering area of low-melting-point metal layers, leading to excessive molten metal generation, delayed blowing times, and increased risk of reconnection, due to the difficulty in accurately forming the bottom metal layer during manufacturing.
Innovation Solution
The protection device incorporates a meltable member with a core metal layer and a bottom metal layer, featuring a hollow part that exposes the bottom metal layer, allowing independent adjustment of the top-view areas of both layers, thereby accelerating the blowing action and reducing the risk of reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bottom metal layer is formed by printing to cover the auxiliary electrode, then the blowing action is accelerated, but the covering area cannot be precisely controlled leading to excessive molten metal generation
Solution Approach 1:
The bottom metal layer is designed with different covering areas in different regions: it covers the auxiliary electrode in the center region to accelerate blowing, but has reduced or no coverage in peripheral regions to prevent excessive molten metal generation. This localized differentiation resolves the contradiction between acceleration needs and precision control.
Solution Approach 2:
The patent optimizes the covering area parameter of the bottom metal layer by adjusting its width and length dimensions. By changing these geometric parameters, the design achieves precise control over the molten metal quantity while maintaining the acceleration function, thus resolving the precision control issue.
2Speed
If the bottom metal layer entirely covers the auxiliary electrode to accelerate blowing, then the blowing action is enhanced, but the risk of reconnection increases due to excessive molten metal
Solution Approach 1:
The bottom metal layer implements selective coverage: it is present in the center region where it contacts the auxiliary electrode to accelerate blowing, but is reduced or absent in peripheral regions to minimize molten metal generation and prevent reconnection. This local differentiation simultaneously achieves acceleration and reliability.
Solution Approach 2:
Instead of entirely covering the auxiliary electrode, the bottom metal layer is applied partially - only in the necessary central region for acceleration. This partial action achieves the blowing acceleration function while avoiding the excessive molten metal generation that would increase reconnection risk.
3Strength
If the core metal layer area is increased to ensure structural integrity, then the structural strength is improved, but the blowing time is delayed
Solution Approach 1:
The core metal layer maintains sufficient width at the edges to ensure structural integrity and handling strength, while the bottom metal layer is concentrated in the center region to accelerate blowing. This spatial differentiation allows the structure to maintain strength while reducing the mass that needs to be melted, thus shortening blowing time.
Solution Approach 2:
The meltable member is functionally segmented into two zones: the core metal layer provides structural framework with adequate strength, while the bottom metal layer in the center provides rapid melting capability. This segmentation allows each component to optimize its function without compromising the other, achieving both structural integrity and fast blowing.
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 the efficiency of the blowing action, reduces the risk of reconnection, and improves the yield rate by controlling the top-view areas of the core and bottom metal layers within specific ranges, ensuring faster operation and improved structural integrity.
Implementation Method 1
The heating element is disposed under the auxiliary electrode, thereby heating up and blowing the meltable member during an over-voltage event
Implementation Method 2
The meltable member has a core metal layer and a bottom metal layer disposed below the core metal layer. A melting point of the bottom metal layer is lower than a melting point of the core metal layer
Data Source
AI summary
A protection device includes a meltable member, an electrode set, and a heating element. The meltable member has a core metal layer and a bottom metal layer disposed therebelow, and a melting point of the bottom metal layer is lower than that of the core metal layer. The electrode set has a first electrode, a second electrode, and an auxiliary electrode. The auxiliary electrode is located between the first electrode and the second electrode, and is disposed under the meltable member, thereby contacting the bottom metal layer. The meltable member has a hollow part penetrating the core metal layer, by which the bottom metal layer on the auxiliary electrode is exposed. The heating element is disposed under the auxiliary electrode, thereby heating up and blowing the meltable member in the event of over-voltage.