Power Transmitting Communication Unit Eddy Current Suppression
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Solution Overview
Problem
Conventional power transmitting communication units experience temperature rises due to eddy currents caused by the magnetic field of the power transmission coil, affecting the communication module's performance.
Innovation Solution
A power transmitting communication unit design featuring a substrate with a spirally formed power transmission coil and a communication module with a conductive member that intersects with an orthogonal plane to the coil's axial direction, minimizing eddy currents and temperature rise by reducing the area affected by the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the communication module is placed on the same substrate as the power transmission coil, then the device structure is simplified and integration is improved, but the temperature of the communication module rises due to eddy currents caused by the magnetic field of the power transmission coil
Solution Approach 1:
The communication module is extracted from the area directly under the power transmission coil and placed in the central opening region. This spatial separation removes the communication module from the harmful magnetic field zone, eliminating eddy current heating while preserving the integrated structure. The power transmission coil maintains its spiral configuration around the opening, and the communication module is positioned where it does not interfere with the magnetic field path.
2Reliability
If the conductive member of the communication module is oriented parallel to the magnetic field lines, then the coupling efficiency is improved, but eddy currents are generated causing temperature rise
Solution Approach 1:
The conductive member is designed with an asymmetric orientation where its long axis extends in the coil axial line direction (vertical direction), perpendicular to the magnetic field lines that circulate horizontally around the coil. This asymmetric positioning at the center of the opening allows the conductive member to intersect the magnetic field minimally, reducing eddy currents while maintaining sufficient coupling area for wireless communication.
3Reliability
If the communication module is positioned at the center of the power transmission coil, then the magnetic field coupling is maximized, but the area affected by eddy currents increases
Solution Approach 1:
The conductive member is oriented vertically in the coil axial line direction, utilizing the third dimension (height/depth) rather than expanding horizontally in the plane perpendicular to the coil axis. This vertical orientation allows the communication module to occupy the central opening space efficiently, maintaining magnetic coupling through the coil's magnetic flux while minimizing the horizontal footprint that would be exposed to eddy currents.
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 solution effectively suppresses temperature rises in both the communication and power transmission coils, improving the transmission efficiency of electric power while maintaining wireless communication capabilities.
Implementation Method 1
a power transmission coil that is spirally formed around an opening, mounted on one surface of the substrate, connected to a circuit of the substrate, and performs transmission of electric power in a non-contact manner
Implementation Method 2
The communication module, however, is susceptible to a magnetic field of the power transmission coil, and there has been a problem in that the temperature of the communication module rises by eddy currents
Data Source
AI summary
A coupling electrode of a communication coupler intersects with an orthogonal plane that is orthogonal to a coil axial line direction of a power transmission coil. That is, the coupling electrode of the communication coupler is not in parallel with the orthogonal plane orthogonal to the coil axial line direction of the power transmission coil. For example, the coupling electrode of the communication coupler is perpendicular to the orthogonal plane being orthogonal to the coil axial line direction, and includes the coil axial line direction in a plane of the coupling electrode.