Non-contact Power Receiving Apparatus Eddy Current Reduction
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Solution Overview
Problem
Existing non-contact power transmission systems suffer from low power transmission efficiency due to significant eddy current losses caused by leakage magnetic flux.
Innovation Solution
The non-contact power receiving apparatus features a power converter circuit with conductive patterns divided into multiple electrodes and via holes, which reduces eddy current loops and loss by allowing eddy currents to circulate within electrodes, while maintaining main current flow, and includes a magnetic sheet to further minimize leakage flux impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power receiving apparatus uses a conventional conductive pattern design, then the apparatus structure is simple, but eddy current loss is significant due to large eddy current loops
Solution Approach 1:
The conductive pattern is divided into multiple separate electrodes (first electrode, second electrode, third electrode) instead of a single continuous pattern. This segmentation breaks up large eddy current loops into smaller ones, reducing eddy current loss while maintaining the necessary electrical connections through via holes.
Solution Approach 2:
The conductive pattern extends into the vertical dimension by using via holes to connect electrodes on different planes (first plane and second plane). This three-dimensional arrangement allows current to flow through multiple layers, creating smaller effective loop areas and reducing eddy current losses compared to a two-dimensional planar design.
2Volume of stationary object
If the power receiving apparatus uses a compact design, then the apparatus size is reduced, but heat dissipation becomes more difficult
Solution Approach 1:
The conductive pattern utilizes the vertical dimension with via holes connecting different planes, allowing heat to dissipate through multiple pathways in three dimensions rather than being confined to a single plane. This multi-layer structure increases the effective heat dissipation surface area within a compact footprint.
Solution Approach 2:
The segmented electrode structure creates multiple separate current paths and heat generation zones, distributing heat more evenly throughout the apparatus rather than concentrating it in a single location. This segmentation facilitates better thermal management in compact designs.
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 configuration significantly reduces eddy current loss, enhancing power transmission efficiency and maintaining a compact apparatus design.
Implementation Method 1
a power receiving coil electromagnetically couplable to the power transmitting coil to receive AC power from the power transmitting apparatus
Implementation Method 2
a power converter circuit connected to the power receiving coil and adapted to convert the AC power into DC power
Data Source
AI summary
The disclosure provides a non-contact power receiving apparatus including a conductive pattern in a second region of a substrate not covered by a magnetic sheet. The conductive pattern includes first and second electrodes provided in a first plane parallel to a surface of the substrate and arranged in a length direction of the conductive pattern. A third electrode is formed on a second plane parallel with the first plane. A first via hole connects superposed portions of the first and third electrodes to each other, and a second via hole connects superposed portions of the second and third electrodes to each other. As a result, loops of eddy currents generated in the conductive pattern can be made to be small, whereby eddy current loss can be reduced.