Flexible PCB Fuse Track Taper for High-Current Interruption
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Solution Overview
Problem
Existing flexible printed circuit boards in electrical devices lack an integrated fuse mechanism to safely interrupt high currents, necessitating separate fuses that increase cost and space requirements and are less reliable due to passive heating.
Innovation Solution
Incorporating a fuse conductor track with a taper into the flexible printed circuit board, where the width narrows at a fuse area, allowing the board to function as both a connector and a fuse, severing when high currents occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fuse is used outside the flexible printed circuit board, then the fuse can interrupt high currents during fault conditions, but the device complexity and installation space increase
Solution Approach 1:
The fuse function is merged with the flexible printed circuit board by integrating a fuse conductor track directly into the board's conductor track structure. The fuse conductor track is formed as part of the same flexible substrate and conductor layer system, eliminating the need for separate fuse components while maintaining current interruption capability.
Solution Approach 2:
The flexible printed circuit board is designed to serve multiple functions: it acts as both a connector for electrical components and as a fuse for current protection. The fuse conductor track is integrated into the board's conductor system, allowing the board to perform both connection and protection functions simultaneously.
2Reliability
If a separate fuse is used outside the flexible printed circuit board, then the fuse can interrupt high currents, but the costs and installation space increase
Solution Approach 1:
The fuse function is merged with the flexible printed circuit board by integrating a fuse conductor track directly into the board's conductor track structure. The fuse conductor track is formed as part of the same flexible substrate and conductor layer system, eliminating the need for separate fuse components while maintaining current interruption capability.
3Reliability
If the flexible printed circuit board runs in the air and is bent as a connector, then passive heating is reduced and reliability is improved, but the fuse conductor track must be more precisely designed
Solution Approach 1:
The fuse conductor track is designed with a localized taper in the fuse area, where the conductor width gradually decreases to create a fuse link. This local geometric modification allows the fuse to be precisely controlled at the critical location while the rest of the conductor track maintains its standard design for flexibility and connection purposes.
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 integrated fuse conductor track provides reliable current interruption, reduces costs and space, and enhances reliability by minimizing passive heating, with easy replacement and low inductance design.
Implementation Method 1
If the current is too high, the fuse conductor track in the flexible printed circuit board is severed at the taper so that current can no longer flow through the fuse conductor track
Data Source
AI summary
A flexible printed circuit board, in particular for connecting electrical and/or electronic components, includes a fuse conductor track (10). The fuse conductor track has a conductor width (B1) formed on the flexible printed circuit board (1). The fuse conductor track (10) has a taper (12) in a fuse area (11) of the fuse conductor track (10), at which the fuse conductor track (10) has a fuse width (B2) which is smaller than the conductor width (B1) of the fuse conductor track (10) outside the fuse area (11).