Asymmetrical Coil Structure for Wireless Terminal Eddy Current Reduction
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Solution Overview
Problem
Wireless terminals face challenges in miniaturization and portability due to spatial limitations, particularly in ensuring sufficient space for coils while mitigating effects from other parts and human body interactions, as well as external metal components that can cause eddy currents and performance degradation.
Innovation Solution
An asymmetrical coil arrangement within a closed-loop metal frame, integrated on the front surface of a display, which maximizes distance from metal components and human body, reducing eddy currents and optimizing magnetic field strength, along with a method to select coils based on wearing state using sensors for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coil is arranged symmetrically within a metal frame, then the structure is simple and manufacturing is easier, but eddy currents are induced in the metal frame causing performance degradation
Solution Approach 1:
The patent applies asymmetry by positioning the coil off-center within the metal frame, specifically placing it closer to one edge than the other. This asymmetric arrangement disrupts the symmetry required for strong eddy current induction, thereby reducing the harmful effects while maintaining manufacturing feasibility
Solution Approach 2:
The patent implements local quality by creating non-uniform spacing between the coil and the metal frame at different locations. The distance varies around the coil perimeter, with closer proximity on one side and greater distance on the other, which locally modifies the electromagnetic field distribution to minimize eddy currents
2Volume of moving object
If the coil is positioned closer to the metal frame to save space, then the device size is reduced, but metal effects and eddy currents increase
Solution Approach 1:
The asymmetric coil positioning allows the coil to be closer to the metal frame on one side while maintaining adequate distance on the opposite side. This enables space optimization without uniformly reducing all distances, thereby controlling metal effects through selective proximity management
3Reliability
If multiple coils are added to enhance communication functionality, then communication performance is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple coils into a single integrated coil structure that functions as a unified electromagnetic component. This merging approach maintains communication performance while reducing the number of separate components, thereby simplifying the overall device complexity
Solution Approach 2:
The asymmetrically positioned coil is designed to serve multiple communication functions simultaneously, including wireless charging, NFC, and other近场通信 protocols. This multi-functionality eliminates the need for separate dedicated coils for each function, reducing device 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 asymmetrical coil structure reduces eddy current intensity, enhances magnetic field strength, and minimizes metal effects, improving communication performance and power efficiency in wireless terminals, particularly in wearable devices.
Implementation Method 1
avoid effects from an outer metal component in a wireless terminal having the outer metal component... reduces eddy current intensity
Implementation Method 2
a coil arranged asymmetrically within the metal frame... supporting a predetermined communication scheme
Data Source
AI summary
A coil arrangement structure supporting wireless communication and a method for operating the same in a wireless terminal are provided. The coil arrangement structure includes a closed-loop metal frame and a coil arranged asymmetrically within the metal frame. The coil is arranged such that a distance between an outer side of the coil and an inner side of the metal frame is not constant and the coil is arranged integrally on a front surface of a display.