Annular Multilayer Substrate Slits for Eddy Current Suppression
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Solution Overview
Problem
Existing contactless power transfer systems face issues with reduced output due to eddy currents generated when a multilayer substrate is used near the power transmission and reception coils, especially in applications like turnable robot parts or network cameras, where the magnetic field interacts with the substrate's ground and power supply patterns.
Innovation Solution
The system employs an annular multilayer substrate with slit portions on the power supply and ground patterns, reducing the loop area where the magnetic field interlinks, thereby minimizing eddy currents and maintaining power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multilayer substrate with ground pattern and power supply pattern is arranged near the power transmission coil and power reception coil, then circuits can be implemented on the substrate, but eddy currents are generated in the ground pattern and power supply pattern, causing significant decrease in the output of the power reception coil
Solution Approach 1:
The ground pattern and power supply pattern on the multilayer substrate are divided into multiple segments by introducing slits. This segmentation breaks the continuous conductive paths that would otherwise form large eddy current loops, thereby reducing eddy current losses and maintaining power reception coil output efficiency.
2Adaptability or versatility
If the multilayer substrate is formed into an annular shape for passage of a shaft, then rotational power can be transmitted through the central axis, but the effect of suppressing eddy currents is reduced
Solution Approach 1:
Even in the annular configuration required for rotational power transmission, the ground and power supply patterns are segmented using slits. This maintains the eddy current suppression effect while accommodating the mechanical requirement of shaft passage through the central axis.
Solution Approach 2:
The annular substrate maintains different structural qualities in different regions: the central axis region is hollow for shaft passage, while the annular regions contain the slit-divided ground and power supply patterns for eddy current suppression.
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 effectively suppresses eddy current losses and maintains the power reception coil's output efficiency, even in applications with limited implementation spaces, such as turnable portions of industrial robots or network cameras.
Implementation Method 1
electromagnetic induction energy from a power transmission coil arranged on the power transmission side is converted to electric energy by a power reception coil arranged on the power reception side
Implementation Method 2
a magnetic field generated from the power transmission coil may be transmitted to an inner layer, of the multilayer substrate, in which a ground pattern is formed on the entire surface and an inner layer having a power supply pattern, and eddy currents may be generated
Data Source
AI summary
A wireless power transfer system includes: (a) an annular first substrate, a first coil, a second coil, and an annular second substrate that are stacked such that central axes of those substantially coincide with each other; (b) a power transmission circuit, implemented on the first substrate, for applying a voltage to the first coil; and (c) a power reception circuit, implemented on the second substrate, for rectifying an electric current that is generated at the second coil through electromagnetic induction and/or magnetic resonance. The second substrate is a multilayer substrate that includes a first layer provided with a ground pattern and a second layer provided with a power supply pattern, and includes slit portions where the patterns are not present as viewed from a direction of the central axes.