Wireless Coil Layout for Magnetic Isolation in Compact Chargers
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving sufficient magnetic isolation between power transfer and communication coils, particularly in devices like wireless earphones and charging cases, which can lead to interference and reduced efficiency.
Innovation Solution
The implementation of vertically separated and shielded magnetic coils, with optional magnetic cores, to create distinct magnetic paths for power transfer and communication, ensuring adequate isolation and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If power transfer and communication coils are placed close together in wireless earphones and charging cases, then device size is reduced, but magnetic isolation between coils deteriorates leading to interference
Solution Approach 1:
A magnetic shield comprising magnetically permeable material is positioned between the power transfer coil and communication coil to intercept and redirect magnetic flux lines. The shield acts as an intermediary that absorbs and redirects magnetic field lines away from the communication coil, significantly reducing magnetic coupling and interference while allowing the coils to remain in close proximity within compact device form factors.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning the magnetic shield at specific orientations and locations between the coils. The shield is configured with specific dimensional parameters (thickness, area, position) to create effective magnetic isolation in the spatial domain, allowing compact coil placement while maintaining isolation through strategic use of the third dimension rather than simply increasing separation distance.
2Object-affected harmful factors
If magnetic shield is added between power transfer and communication coils, then magnetic isolation is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the magnetic shield parameters (material permeability, thickness, area, and position) to achieve effective magnetic isolation with minimal added complexity. By carefully selecting and tuning these parameters, the shield provides sufficient isolation performance while maintaining a simple, manufacturable design that integrates easily into existing wireless earphone and charging case structures without requiring complex multi-layer or adjustable configurations.
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 enhances magnetic isolation, allowing for efficient power transfer and communication without interference, suitable for devices such as wireless earphones and charging cases.
Implementation Method 1
a power receiving coil configured to be magnetically coupled to a power transmitting coil of a wireless power transmitter
Implementation Method 2
a winding configured to be magnetically coupled to a corresponding communications coil of the wireless power transmitter to allow communications
Implementation Method 3
a shield disposed between the power receiving coil and the wireless communications coil. At least one of a height of the communications coil and a vertical separation between the communications coil and the power receiving coil can be selected to provide a desired degree of magnetic isolation therebetween
Data Source
AI summary
A device can include a wireless power transfer coil couplable to a complementary wireless power transfer coil of another device. The device can further include wireless power transmitting and/or receiving circuitry. The device can still further include a processing and communications system, and a wireless communications coil coupled to the processing and communications system. The communications coil can include a winding magnetically couplable to a corresponding communications coil of the complementary device to allow communications between the processing and communications system and the complementary device. The wireless communications coil can be separated from the power transfer coil along a longitudinal axis of the device.