Electronic Part Terminal with Fuse 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, and the risk of re-connection of melted-down fuse portions, which complicates the use of the same boards for various electronic control units and increases size.
Innovation Solution
An electronic part with a main body and electrodes is mounted above the printed board, supported by a terminal with a supporting member and a fuse wiring member that includes a cut-off portion, preventing re-connection by maintaining the cut-off portion above the board surface and allowing elastic deformation to manage thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pattern fuses are individually designed for different electronic parts or different ratings, then fuse protection accuracy is improved, but printed board standardization and commonalization become difficult
Solution Approach 1:
The terminal structure serves multiple functions: it supports the main body above the board surface, provides electrical connection through the wiring member, and positions the fuse portion above the board surface. This universal structure can be applied to different types of electronic parts and different ratings without requiring individualized fuse designs, enabling printed board standardization and commonalization.
2Reliability
If pattern fuses are provided on the printed board as part of wiring patterns, then fuse function is achieved, but the size of the printed board and electronic control unit increases
Solution Approach 1:
By moving the fuse portion from the board surface to a position above the board surface and utilizing the terminal structure, the fuse function is achieved without occupying additional board surface area. This vertical arrangement enables high-density packaging and reduces the overall size of the printed board and electronic control unit.
3Reliability
If the terminal supports the main body above the board surface with separate supporting and wiring functions, then re-connection prevention and standardization are improved, but device structure complexity increases
Solution Approach 1:
The terminal merges the supporting function (supporting member) and the wiring function (wiring member) into a single integrated component. The supporting member supports the main body above the board surface, while the wiring member provides electrical connection. This merging achieves re-connection prevention and standardization without significantly increasing overall device complexity, as both functions are combined in one structure.
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 solution enables standardization and miniaturization of printed boards, prevents re-connection of melted-down fuse portions, and enhances the reliability of electrical connections by independently providing wiring and supporting functions, reducing stress and allowing for high-density packaging.
Implementation Method 1
a leg portion extending from the holding portion to the printed board, the leg portion being elastically deformable in a direction in which the multiple electrodes are arranged
Implementation Method 2
it is possible to reduce stress applied to connected areas between the wiring members and the electrodes and stress applied to connected areas between the wiring members and the lands
Implementation Method 3
the cut-off portion is melted down depending heat generated by excess current in order to cut off the excess current
Data Source
AI summary
A main body of an electronic part is supported by terminals at a position above and separated from a board surface of a printed board. Each of the terminals is composed of a supporting member made of electrically insulating material and a wiring member. Each of the wiring member has an electrode-connected portion electrically connected to an electrode formed on the main body and a land-connected portion electrically connected to a land formed in the printed board. One of the wiring members is composed of a fuse wiring member having a cut-off portion, which is melted down when excess current flows. The wiring member is outwardly expanded in a direction opposite to the main body.