Composite Fuse Element Arc Suppression via Segmented Substrate
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Solution Overview
Problem
Conventional fuses have limited arc quenching capabilities due to insufficient contact area between insulative filler materials and fuse elements, leading to excessive arcing times that can cause damage to protected circuit components.
Innovation Solution
A composite fuse element featuring an insulating substrate with a conductive metallic portion in continuous, intimate contact, which provides improved arc suppression by increasing the contact area and facilitating faster arc quenching through the use of a helical metallic pathway or patterned metallic portions with weak points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulative filler material is used to suppress electrical arc, then arc suppression is achieved, but arc quenching time remains excessive due to limited surface area contact between filler material and fuse element
Solution Approach 1:
The insulative substrate is divided into multiple segments with recesses that increase the surface area contact between the substrate and fuse element. This segmentation creates multiple quenching zones along the fuse element, allowing the arc to be suppressed at multiple points simultaneously, thereby reducing overall arc quenching time while maintaining reliable arc suppression.
Solution Approach 2:
The invention transitions from a flat, two-dimensional contact surface to a three-dimensional structured surface with recesses and increased surface area. This dimensional change allows the insulative substrate to engage the fuse element along its length in multiple zones, dramatically increasing the effective contact area for arc quenching without increasing the overall footprint of the component.
2Ease of manufacture
If conventional fuse element design is used, then manufacturing is simple, but arc quenching performance is insufficient
Solution Approach 1:
The invention employs a composite structure combining an insulative substrate with integrated metallic portions formed from conductive paste. This composite design merges the arc-suppressing properties of insulative materials with the electrical conductivity of metals, creating a fuse element that achieves superior arc quenching performance while remaining compatible with conventional manufacturing processes like screen printing and firing.
Solution Approach 2:
The invention changes the physical and chemical parameters of the fuse element by using a composite structure with specific surface area, porosity, and material composition. The insulative substrate with recesses provides optimized surface area-to-volume ratio and controlled porosity to enhance arc quenching, while the conductive paste composition and firing parameters are adjusted to achieve the desired metallic pathway properties.
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 composite fuse element achieves significantly faster arc quenching times, typically under 100 microseconds, compared to conventional fuses which take milliseconds, effectively preventing damage to protected circuit components.
Implementation Method 1
a conductive metallic portion disposed on at least one surface of the insulating substrate portion... The metallic portion provides an electrically conductive pathway from a first end of the substrate portion to a second end of the substrate portion
Implementation Method 2
The insulative filler material 160 acts to suppress the electrical arc in the exemplary conventional fuse 100 by filling the gap that forms between melted portions of the fuse element 120
Implementation Method 3
When the fuse element 120 melts or separates due to a predetermined, excessive amount of current flowing through the fuse element 120
Implementation Method 4
an electric arc forms between the un-melted portions of the element
Data Source
AI summary
An improved fuse element for use in a circuit protection fuse. The fuse element may include an insulating substrate portion and a conductive metallic portion disposed on at least one surface of the insulating substrate portion, wherein the metallic portion extends along, and is in continuous, intimate contact with the substrate portion. When the metallic portion melts and separates upon the occurrence of an overcurrent condition, the substrate portion bridges the resulting gap that is formed in the metallic portion and provides electrical arc suppression therein.