Magnetic Shield Battery Reducing Interference
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Solution Overview
Problem
Mobile communication devices generate significant magnetic interference due to current draw, particularly from their batteries, which can interfere with hearing aids and other electronic devices, and existing solutions do not adequately minimize this interference.
Innovation Solution
Incorporating a magnetic shield with high magnetic permeability materials, such as Mu Metal, around the battery to redirect magnetic flux away from the device's receiver, thereby reducing interference with nearby electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional battery design is used in mobile communication devices, then the device can operate normally, but significant magnetic interference is generated that interferes with hearing aids and other electronic devices
Solution Approach 1:
A magnetic shield component is introduced as an intermediary between the battery and the receiver to block and redirect magnetic flux. The shield acts as a mediator that prevents harmful magnetic fields from reaching the receiver and interfering with hearing aids, while allowing the battery to continue functioning normally.
Solution Approach 2:
The magnetic shielding function is extracted as a separate component from the battery assembly. Instead of relying on the battery case alone, a dedicated magnetic shield portion is provided that can be positioned between the battery and receiver to specifically address magnetic interference without affecting other battery functions.
2Object-affected harmful factors
If current loops and circuit board traces are altered to minimize magnetic interference, then hearing aid compatibility improves, but device complexity increases
Solution Approach 1:
Rather than modifying complex circuit board traces and current loops, a simple magnetic shield component is introduced as a physical barrier. This intermediary approach achieves magnetic interference reduction without requiring changes to the electrical circuit design, thereby maintaining device simplicity.
3Object-affected harmful factors
If the receiver current is increased to meet signal-to-noise ratio requirements, then hearing aid compatibility improves, but magnetic interference increases
Solution Approach 1:
The magnetic shield serves as a protective intermediary that allows the receiver to operate at optimal current levels for hearing aid compatibility without generating excessive magnetic noise. The shield blocks the magnetic flux paths that would otherwise interfere with hearing aids, decoupling the relationship between receiver current and magnetic interference.
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 magnetic shield effectively reduces magnetic noise by more than 10 dB, improving the signal-to-noise ratio for hearing aids and minimizing interference with other electronic devices.
Implementation Method 1
Incorporating a magnetic shield with high magnetic permeability materials, such as Mu Metal, around the battery to redirect magnetic flux away from the device's receiver
Data Source
AI summary
A communication device and battery there for, are provided. In at least one of the battery and the communication device is provided a magnetic shield portion (712, 1012, 1412, 1512a, 1512b) for routing magnetic flux away from the receiver (224) when the radio (201) is in operation. The magnetic shield portion (712, 1012, 1412, 1512a, 1512b) can be incorporated into at least one of the battery and the communication device. When the battery is inserted into mobile communications devicemobile communication device, the magnetic shield portion (712, 1012, 1412, 1512a, 1512b) is located substantially between a battery portion, in the battery, and the receiver (224).