Fuse Terminal in Electronic Part for PCB Standardization
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Solution Overview
Problem
Existing printed boards with pattern fuses face challenges in standardization and miniaturization due to the need for individual design for different electronic parts, slow response to short-circuit events, and increased manufacturing costs associated with heat management and material selection for pattern fuses.
Innovation Solution
An electronic part with a pillared shape and a fuse terminal having a cut-off portion with a smaller cross-sectional area, which is melted down by excess current to cut off the electrical connection, eliminating the need for pattern fuses on the printed board, allowing for standardization and miniaturization, and improving response time and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pattern fuses are used in printed boards for different electronic parts, then short-circuit protection is achieved, but individual design is required for each electronic part type, making standardization difficult
Solution Approach 1:
The fuse function is segmented from the printed board wiring pattern and integrated into the electronic part itself as a separate fuse terminal component. This allows the fuse to be a standardized element that can be used across different electronic part types without requiring custom printed board design for each application.
Solution Approach 2:
The fuse function is extracted from the printed board and embodied in the electronic part's fuse terminal. This extraction enables the printed board to use standardized wiring patterns while the fuse protection is provided by the electronic part itself, resolving the contradiction between protection reliability and design standardization.
2Reliability
If pattern fuses are provided on printed boards, then short-circuit protection is achieved, but the printed board size increases
Solution Approach 1:
The fuse function is extracted from the printed board and integrated into the electronic part. This eliminates the need for additional space on the printed board for pattern fuses, allowing the printed board size to be minimized while maintaining short-circuit protection through the electronic part's integrated fuse terminal.
3Reliability
If pattern fuses are used on printed boards, then short-circuit protection is achieved, but heat generated at the pattern fuse transfers to the insulating board, slowing down the cut-off response
Solution Approach 1:
The fuse terminal is extracted from the printed board and integrated into the electronic part, with the melt-down portion positioned away from the printed board. This spatial separation prevents heat transfer to the insulating board, enabling faster cut-off response while maintaining reliable short-circuit protection.
Solution Approach 2:
The fuse terminal structure acts as an intermediary between the electronic part and the printed board, with the melt-down portion serving as a heat isolation barrier. This intermediary structure allows the fuse to operate independently without transferring harmful heat to the printed board, improving response time.
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
Enables the use of standardized printed boards for various electronic control units, reduces board size and manufacturing costs, enhances response time and accuracy of cut-off performance, and allows for high-density packaging while minimizing heat transfer to the printed board.
Implementation Method 1
a connecting portion extending from the electrode-connected portion in a direction away from the main body and further extending in the axial direction of the main body in order to electrically connect the electrode-connected portion to the wire-connected portion, wherein the connecting portion has a cut-off portion, which has a cross sectional area smaller than that of other portions of the fuse terminal and which is melted down by heat generated by excess current flowing through the cut-off portion
Data Source
AI summary
A main body of an electronic part is formed in a rectangular pillared shape having a first and a second axial end surface. A first electrode is formed on the first axial end surface electrically and mechanically connected to a first wiring pattern formed on a board surface of a printed board. A second electrode is formed on the second axial end surface, to which one end of a fuse terminal is electrically connected. The other end of the fuse terminal is connected to a second wiring pattern of the printed board or a wiring member which is formed as an independent member from the printed board. A cut-off portion is formed in a connecting portion of the fuse terminal.