Two-Sided Inductive Charging Coil With Magnetic Insulation
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Solution Overview
Problem
Conventional wireless charging systems for electronic accessory devices require precise positioning and can suffer from power loss and potential damage due to magnetic coupling between coils, especially when the device is mounted or attached to a computer in multiple positions.
Innovation Solution
The implementation of a wireless charging system that includes two transmission coils and two receiving coils, stacked with ferrite and a non-magnetic material to inhibit coupling effects, allowing for efficient charging in multiple positions without magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two transmission coils are stacked close to each other to enable charging from both surfaces, then charging versatility is improved, but magnetic coupling between coils causes power loss and potential damage
Solution Approach 1:
A magnetic insulator is introduced as an intermediary material positioned between the first and second transmission coils. This magnetic insulator prevents magnetic coupling between the coils while allowing both coils to function for charging from either surface, thus resolving the contradiction between charging versatility and power loss
2Power
If transmission coils are positioned close to the device surface for efficient power transmission, then power transmission efficiency is improved, but magnetic coupling between stacked coils increases causing potential damage
Solution Approach 1:
The magnetic insulator serves as a protective intermediary that allows the transmission coils to be positioned close to the device surfaces for efficient power transmission while simultaneously blocking harmful magnetic coupling between the stacked coils
3Adaptability or versatility
If conventional single-coil charging systems are used, then device complexity is reduced, but the device cannot charge accessories in multiple positions simultaneously
Solution Approach 1:
The charging system is segmented into multiple independent transmission coils (first and second coils) positioned at different surfaces, with each coil capable of independent operation. This segmentation enables multi-position charging capability while the magnetic insulator prevents interference between segments
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 solution enables efficient wireless charging of electronic accessory devices in various positions, reducing the size and power requirements of the coils while preventing power loss and damage from magnetic coupling.
Implementation Method 1
Inductive charging provides a current through transmission coil to generate a magnetic field. Exposure of a second coil of conductive material to the magnetic field induces a current through the receiving coil to wirelessly power an electronic device or charge a battery.
Implementation Method 2
The coils are stacked with ferrite and a non-magnetic material in-between the coils to inhibit the coupling effects within the computer.
Data Source
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.