Multi-Coil Wireless Charging Layout With Magnets for Profile Compatibility
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Solution Overview
Problem
Existing wireless power transfer systems face compatibility issues between different power profiles, leading to inefficient charging and potential damage to receivers due to overvoltage, especially when transferring power between devices with varying power levels.
Innovation Solution
A wireless power transmitter design incorporating multiple primary coils and strategically placed permanent magnets, allowing for compatibility with MPP and BPP/EPP receivers while minimizing charging efficiency deterioration, by optimizing coil placement and magnetic field concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple primary coils are used to support different power profiles, then compatibility with various receivers is improved, but charging efficiency deteriorates due to magnetic field interference between coils
Solution Approach 1:
The wireless power transmitter divides the magnetic field generation into separate segments using multiple independent primary coils (first primary coil and second primary coil). Each coil can be independently controlled to serve different power profiles (MPP and BPP/EPP), allowing the system to segment the power transmission function across multiple coils rather than using a single coil for all functions.
Solution Approach 2:
Permanent magnets are strategically positioned at specific locations (first and second positions) to create localized magnetic field enhancement in different regions. The first permanent magnet enhances the magnetic field of the first primary coil, while the second permanent magnet enhances the magnetic field of the second primary coil, providing local quality improvement to each coil's magnetic field without affecting the other coil's performance.
2Productivity
If permanent magnets are placed to enhance magnetic field for power transfer, then power transfer efficiency is improved, but magnetic field distortion occurs affecting receiver compatibility
Solution Approach 1:
Permanent magnets are positioned at specific locations (first position for first primary coil, second position for second primary coil) to provide localized magnetic field enhancement. This local quality approach ensures that each permanent magnet only enhances its corresponding coil's magnetic field without causing broad magnetic field distortion that would affect receiver compatibility across different power profiles.
Solution Approach 2:
The magnetic field enhancement is segmented into separate regions, with each permanent magnet serving only its corresponding primary coil. This segmentation prevents magnetic field interference between the two power profile systems, maintaining stable magnetic field distribution for each profile while improving overall power transfer efficiency.
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
Ensures stable and efficient power transfer across different power profiles, preventing overvoltage and enhancing user experience by maintaining compatibility between various wireless power receivers.
Implementation Method 1
a plurality of primary coils that transmit wireless power through magnetic coupling with the secondary coil of the wireless power receiver
Implementation Method 2
the plurality of permanent magnets may be disposed between the first bottom coil and the second bottom coil at predetermined intervals along a concentric direction with respect to an axis perpendicular to the first plane
Data Source
AI summary
A wireless power transmitter includes: a plurality of primary coils for transmitting wireless power through magnetic coupling with a secondary coil of a wireless power receiver; and a plurality of permanent magnets arranged not to overlap the plurality of primary coils. The plurality of primary coils include: a first bottom coil and a second bottom coil which are arranged side by side in the width direction on a first plane and do not overlap each other; and a top coil disposed on a second plane positioned above the first plane. One side of the top coil is positioned above the first bottom coil, and the other side of the top coil is positioned above the second bottom coil. The plurality of permanent magnets are arranged between the first bottom coil and the second bottom coil at certain intervals along concentric circles around an axis perpendicular to the first plane.