Stacked Two-Sided Charging Coils With Magnetic Insulation
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Solution Overview
Problem
Conventional inductive charging systems for wireless accessory devices require precise positioning of coils, leading to inefficient power transmission due to rapid power loss with distance, and can cause magnetic coupling issues that may damage charging circuitry.
Innovation Solution
A system with two transmission coils and two receiving coils, stacked with a spacer to prevent magnetic coupling, allowing efficient charging in multiple positions by positioning coils close to the device surfaces, reducing size and power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If two transmission coils are stacked close to opposite surfaces for efficient charging in multiple positions, then charging efficiency is improved, but magnetic coupling between coils causes power loss and potential damage to charging circuitry
Solution Approach 1:
A non-conductive spacer is positioned between the first transmission coil and the second transmission coil to physically separate them and prevent magnetic coupling. This intermediary element allows the coils to be stacked close to opposite surfaces for efficient charging while maintaining sufficient distance to avoid harmful magnetic interactions and power loss.
2Loss of energy
If transmission coil and receiving coil are positioned close together for efficient power transmission, then power transmission efficiency is improved, but precise positioning requirements increase device complexity
Solution Approach 1:
The system transitions from a single-plane coil arrangement to a three-dimensional stacked configuration with coils on opposite surfaces. This dimensional change allows the accessory to be charged in multiple orientations (e.g., lid-up or lid-down for laptops) while maintaining close proximity between transmission and receiving coils for efficient power transfer.
3Adaptability or versatility
If two transmission coils are used for multi-position charging, then charging versatility is improved, but device size and power requirements increase
Solution Approach 1:
The first and second transmission coils are stacked in a nested configuration on opposite surfaces of the electronic device, with a non-conductive spacer between them. This nesting approach allows both coils to be integrated into the same device footprint without significantly increasing overall size, enabling multi-position charging while maintaining compact form factor.
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
Enables efficient wireless charging in multiple positions with reduced power consumption and size, maintaining power transmission efficiency while preventing magnetic coupling damage.
Implementation Method 1
Inductive charging provides a current through transmission coil to generate a magnetic field
Implementation Method 2
The spacer material magnetically insulates the second transmission coil from the first magnetic field
Data Source
Figure 1-1~1-2
Figure 2-1~2-2
Figure 3~4
AI summary
A device for inductively charging an electronic accessory includes a first portion, a second portion, and a spacer. The first portion includes a first transmission coil in a first plane where the first transmission coil is configured to generate a first magnetic field, and the second portion includes a first transmission coil in a second plane where the second transmission coil is configured to generate a second magnetic field. The spacer is positioned between the first transmission coil and the second transmission coil and between the first plane and the second plane. The spacer material magnetically insulates the second transmission coil from the first magnetic field.