Circuit Board Ground Wire Positioning for EMI Shielding
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Solution Overview
Problem
Circuit boards in mobile devices face challenges in reducing Electromagnetic Interference (EMI) noise during power transmission, which existing solutions with shielding layers increase manufacturing costs.
Innovation Solution
A circuit board design featuring a flexible wire part with a ground wire positioned outwardly from the power wire, connecting the main board to the battery module, where the ground wire is placed in the region with fewer modules and the power wire in the region with more modules, utilizing multiple copper foil layers and coverlay films for effective noise shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is added on the power transmission line to reduce EMI noise, then the EMI noise is reduced, but the manufacturing cost increases due to additional processes
Solution Approach 1:
The ground wire serves dual purposes: it acts as both a reference potential path for power transmission and as a shielding layer against EMI noise. By combining these two functions into a single structural element, the patent eliminates the need for separate shielding layers, thereby reducing manufacturing complexity and cost while maintaining EMI protection
Solution Approach 2:
The ground wire is designed to perform multiple functions simultaneously: providing a reference potential for electrical circuits, serving as a return path for current, and acting as a shielding layer against electromagnetic interference. This multi-functionality reduces the overall component count and manufacturing steps required
2Adaptability or versatility
If various circuit modules are installed in the internal space of a mobile terminal, then the functionality is enhanced, but the internal space becomes narrow leading to increased EMI noise
Solution Approach 1:
The ground wire is strategically positioned outward from the power wire specifically in regions where EMI noise is most likely to occur. This localized placement of shielding functionality addresses the EMI problem in critical areas without requiring uniform shielding throughout the entire circuit board, thus preserving space for other modules
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 effectively reduces EMI noise while maintaining a low manufacturing cost by strategically placing the ground wire to shield external interference, ensuring reliable power transmission.
Implementation Method 1
the ground wire is disposed more outward than the power wire, within the wire part... strategically placing the ground wire to shield external interference
Data Source
AI summary
An embodiment provides a circuit board including: a terminal part including a plurality of first terminals, a body part spaced apart from the terminal part and including a plurality of second terminals, and a wire part between the terminal part and the body part, wherein the wire part includes a power wire and a ground wire connecting the plurality of first terminals and the plurality of second terminals, and the ground wire is disposed more outward than the power wire, within the wire part.