Covered PCB Conductor Fuse for Plasma Arc Containment
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Solution Overview
Problem
Conductor track fuses for printed circuit boards face challenges in safely and efficiently interrupting power supply during faults, particularly in preventing uncontrolled plasma arcs that can cause further damage.
Innovation Solution
A conductor track fuse design featuring a non-linear burn-through area with a contiguous cover element that includes a degassing opening, ensuring the plasma is contained and does not reach other contacts, made from materials like untinned copper with a reduced cross-section, allowing for efficient production and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fuse design with complete enclosure is used, then plasma containment is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The cover element is segmented into side walls that do not completely enclose the cavity, creating a degassing opening. This segmentation allows plasma to be contained in specific areas while providing a controlled escape path, reducing the complexity of a fully enclosed structure while maintaining safety.
Solution Approach 2:
The degassing opening acts as an intermediary element between the enclosed cavity and the external environment. It provides a controlled interface for plasma discharge, allowing the system to maintain containment where needed while safely releasing energy in controlled directions, thus resolving the contradiction between complete enclosure and manufacturing simplicity.
2Manufacturing precision
If a linear burn-through area is used, then manufacturing precision is improved, but plasma control and containment become difficult
Solution Approach 1:
The burn-through area is designed with a curved or non-linear profile instead of a straight line. This curvature helps to contain and direct the plasma arc along a controlled path, preventing uncontrolled arcing while remaining manufacturable through standard PCB fabrication processes.
3Reliability
If a hermetically sealed cover is used, then plasma containment is improved, but degassing and pressure relief become problematic
Solution Approach 1:
The degassing opening extracts the harmful pressure buildup effect from the system by providing a controlled escape path for gases and plasma. Instead of completely sealing the cavity, this opening allows the system to safely release pressure while maintaining containment of the plasma arc through the side walls.
4Reliability
If complete enclosure is implemented, then arc extinction control is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The cover element is segmented into side walls with a deliberate opening, eliminating the need for complex hermetic sealing while maintaining arc extinction control. The segmented structure is simpler to manufacture using standard PCB lamination processes, reducing both cost and manufacturing 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 design enhances operational reliability by safely interrupting power supply and preventing uncontrolled plasma arcs, reducing production time and costs while ensuring effective protection of the circuit board.
Implementation Method 1
The fusible element is heated by the current flowing through it and melts or vaporizes if the rated current of the fusible element is significantly exceeded
Implementation Method 2
The fusible element is heated by the current flowing through it and melts or vaporizes
Implementation Method 3
The fusible element is heated by the current flowing through it and melts or vaporizes
Implementation Method 4
this prevents plasma generated when the fuse melts or evaporates from finding a new, live contact pair, causing uncontrolled arcing
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a conducting track fuse (1) for an electrical or electronic device, comprising: a first and a second connection region (2a, 2b); a nonlinearly extending burn-out region (3), which is arranged between the first and second connection regions (2a, 2b); and a covering element (5), which has at least two side walls (9) and a covering face (8), which covering element is arranged over the first and second connection regions (2a, 2b) and over the burn-out region (3), the burn-out region (3) and the covering element (5) being arranged relative to each other in such a way that the area of the covering face (8) covers the burn-out region (3) and a cavity (7) is formed between the burn-out region (3) and the covering face (8) as a result of the height of the side walls (9).