Parallel Fuse Element Design for Arc Suppression
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Solution Overview
Problem
Conventional current fuses face challenges in increasing rated currents to match growing electrical device capacities while preventing explosive scattering of low melting point metal during arc discharge, which requires complex materials and processing.
Innovation Solution
A current fuse design featuring a main fuse element with a low melting point and a sub-fuse element with a higher melting point, connected in parallel, where the sub-fuse element takes over current flow after the main fuse element blows, minimizing arc discharge and preventing explosive scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low melting point metal fuse element is used to enable reliable circuit cutoff, then the fuse element melts and blows to cut off the current path, but arc discharge is generated that causes explosive scattering of vaporized metal
Solution Approach 1:
A sub-fuse element with higher melting point is introduced as an intermediary component. This sub-fuse element acts as a mediator that carries current after the main fuse element blows, preventing direct arc discharge at the main fuse element and thus preventing explosive scattering of low melting point metal
Solution Approach 2:
The melting point parameter of the fuse element is changed by introducing a sub-fuse element with higher melting point than the main fuse element. This parameter change allows the system to maintain reliable circuit cutoff while avoiding the harmful effects of arc discharge at the low melting point element
2Power
If the rated current of the current fuse is increased to respond to increases in capacity of electrical devices, then the fuse can handle higher currents, but arc discharge becomes more intense causing wider area melting and more explosive scattering
Solution Approach 1:
The sub-fuse element serves as an intermediary that handles high current transmission. By having the sub-fuse element (with higher melting point) carry the current, the intensity of arc discharge is reduced even when rated current is increased, preventing wide area melting and explosive scattering
Solution Approach 2:
The current fuse uses a composite structure combining a low melting point main fuse element and a high melting point sub-fuse element. This composite material approach allows the system to achieve both high rated current capability and reduced arc discharge effects
3Reliability
If arc-extinguishing material is enclosed in a hollow case to quickly stop arc discharge, then arc discharge is suppressed, but the device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for complex arc-extinguishing material enclosures by using a simpler sub-fuse element approach. The sub-fuse element naturally suppresses arc discharge through its higher melting point and current-carrying function, avoiding the need for additional hollow cases and complex materials
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 rated current capacity while preventing explosive scattering of low melting point metal, ensuring reliable circuit cutoff with reduced complexity and size requirements.
Implementation Method 1
a current fuse that is mounted on a current path and that blows by self-heating to cut off the current path when current exceeding a rating of the current fuse flows
Implementation Method 2
an arc discharge is generated that causes melting of the fuse element over a wide area and explosive scattering of vaporized metal
Data Source
AI summary
Provided is a current fuse that can improve the rating while also preventing explosive scattering of metal in association with arc discharge and enabling reliable cutting off of a circuit. The current fuse (1) includes an insulating substrate (2), a main fuse element (3) disposed on the insulating substrate (2), and a sub-fuse element (4) disposed on the insulating substrate (2) and having a higher melting point than the main fuse element (3). The main fuse element (3) and the sub-fuse element (4) are connected in parallel.