3D Wireless Charging Coil Structure for Misalignment Tolerance
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Solution Overview
Problem
In wireless power transmission systems using inductive coupling, efficiency is reduced when the center axes of the power transmitting and receiving coils are misaligned.
Innovation Solution
The coils are shaped such that their central portions are located beyond their outer peripheral portions, with magnetic and electrical conduction shields to enhance coupling and reduce magnetic field leakage, allowing for efficient power transmission even with misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the center axes of the power transmitting coil and power receiving coil are aligned, then the efficiency of power transmission is high, but the ease of operation deteriorates when misalignment occurs
Solution Approach 1:
The power receiving coil is designed with an asymmetric structure where the central portion is positioned beyond the outer peripheral portion when viewed from the power transmitting coil. This asymmetric geometry allows the coil to maintain effective coupling even when the center axes are misaligned, reducing sensitivity to alignment requirements while preserving power transmission efficiency.
Solution Approach 2:
The invention transitions from a conventional planar coil structure to a three-dimensional structure where the central portion of the receiving coil extends beyond its outer peripheral portion in the depth direction. This dimensional change creates a larger effective coupling area that is less sensitive to lateral misalignment between the transmitting and receiving coils.
2Loss of energy
If the coils are positioned close to each other for inductive coupling, then the power transmission efficiency is improved, but the magnetic field leakage increases
Solution Approach 1:
The invention utilizes magnetic shields positioned around the coils to convert the harmful magnetic field leakage into a beneficial effect. The shields redirect and concentrate the magnetic flux between the transmitting and receiving coils, reducing external leakage while enhancing the coupling efficiency between the coils.
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 reduces the decrease in coupling efficiency and maintains high power transmission efficiency even when the coils are not perfectly aligned, enhancing user convenience in applications like shared mobility services.
Implementation Method 1
wireless power transmission techniques for wirelessly transmitting electric power... utilizes inductive coupling between coils... power transmitting coil that performs energy transmission via inductive coupling
Data Source
AI summary
A wireless power supply unit includes: a power transmitting coil; and a power receiving coil that wirelessly receives electric power from the power transmitting coil. One of the power transmitting coil and the power receiving coil is shaped so that, during use, a central portion thereof is located beyond an outer peripheral portion thereof, as viewed from another one of the power transmitting coil and the power receiving coil.