Ferrite Shield Adapter for Wireless Power Compatibility
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Solution Overview
Problem
Wireless power receivers with an array of magnets experience overheating and reduced energy transfer when used with transmitters lacking a corresponding array of magnets, due to unwanted magnetic field interactions causing eddy current losses.
Innovation Solution
An adapter device with a ferrite shield is placed between the wireless power transmitter and receiver to shunt or direct the magnetic field away from unshielded components, minimizing eddy current losses and maintaining alignment through a ferrite shield positioned between the source coils and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless power receiver with an array of magnets is used with a transmitter lacking a corresponding array of magnets, then compatibility between differently configured transmitters and receivers is achieved, but overheating and reduced energy transfer occur due to eddy current losses
Solution Approach 1:
A ferrite shield is introduced as an intermediary component between the transmitter and receiver. The ferrite shield has high magnetic permeability that provides a low-reluctance path for magnetic flux, effectively shunting the magnetic field away from the receiver's magnet array and reducing eddy current losses while maintaining power transfer compatibility
2Loss of energy
If a ferrite shield is placed between the transmitter and receiver to reduce eddy current losses, then energy transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The ferrite shield serves as a simple intermediary component that can be integrated into existing transmitter or receiver designs without requiring fundamental redesign. The shield's passive magnetic shielding function achieves energy efficiency improvement with minimal added complexity
Solution Approach 2:
The ferrite shield changes the magnetic field distribution parameters by providing an alternative low-reluctance path for magnetic flux. This parameter change in magnetic flux density distribution reduces eddy current induction in the receiver's magnet array while maintaining overall system functionality
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
The ferrite shield effectively reduces heating and ensures efficient energy transfer by directing magnetic fields away from sensitive components, allowing compatibility between differently configured transmitters and receivers while maintaining alignment.
Implementation Method 1
A ferrite shield formed of a magnetic material and configured to be placed between the wireless power receiver and the wireless power transmitter
Implementation Method 2
This heating is due to friendly metal losses in the magnets and other unshielded components in the receiver or consumer electronic device containing the receiver being located within the magnetic field generated by the source coil
Data Source
AI summary
An adapter device is configured to interface between a wireless power receiver that includes a first array of magnets arranged around a receiver coil in the wireless power receiver and a wireless power transmitter lacking a corresponding array of magnets arranged around a source coil in the wireless power transmitter. The adapter device includes a substrate and a ferrite shield formed of a magnetic material and configured to be placed between the wireless power receiver and the wireless power transmitter.