Magnetic Shield Battery Routing Flux Away from Receiver
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Solution Overview
Problem
Mobile communication devices generate magnetic interference due to current draw during GSM radio transmission, which affects hearing aid compatibility and interferes with nearby electronic devices.
Innovation Solution
A battery with a magnetic shield portion made of high magnetic permeability material, such as Mu metal, is integrated into the mobile communication device to route magnetic flux away from the receiver, minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current is increased in the mobile communication device receiver, then signal-to-noise ratio is improved, but magnetic interference is increased
Solution Approach 1:
A magnetic shield component is introduced as an intermediary between the battery and the receiver/T-coil. This shield, made of high magnetic permeability material, provides a preferred path for magnetic flux, acting as a mediator that redirects the magnetic field away from sensitive components while allowing the receiver to maintain its operating current levels
2Reliability
If a separate T-coil is installed within the mobile communication device, then hearing aid compatibility is improved, but device complexity is increased
Solution Approach 1:
The magnetic shield serves as an intermediary that protects the existing T-coil from magnetic interference without requiring additional T-coils or complex circuit modifications. The shield redirects magnetic flux away from the T-coil, maintaining hearing aid compatibility while preserving the existing device architecture
Solution Approach 2:
The magnetic interference problem is extracted and isolated from the receiver/T-coil system by placing the magnetic shield between the battery and these components. This separates the source of interference (battery magnetic field) from the sensitive components, allowing them to function independently
3Object-generated harmful factors
If current loops and circuit board traces are altered to minimize magnetic interference, then magnetic interference is reduced, but manufacturing precision is increased
Solution Approach 1:
The magnetic shield is introduced as a straightforward intermediary component that can be integrated into the battery assembly without requiring complex alterations to current loops or circuit board traces. This simple structural addition provides effective magnetic shielding while maintaining ease of manufacturing
Solution Approach 2:
The magnetic interference mitigation function is extracted from the complex circuit board design and implemented as a separate magnetic shield component. This allows the circuit board to maintain its original simple layout while the shield handles the magnetic interference protection
4Object-generated harmful factors
If magnetic shield portion is added to the battery, then magnetic interference is reduced, but device complexity is increased
Solution Approach 1:
The magnetic shield portion is merged with the battery assembly, forming an integrated unit where the shield becomes part of the battery structure. This combination approach adds the shielding function without creating a separate independent component system, thereby minimizing the increase in overall device complexity
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 significantly reduces magnetic noise by directing magnetic flux away from the receiver, improving hearing aid compatibility and reducing interference with other electronic devices.
Implementation Method 1
a magnetic shield portion arranged relative to the battery portion such that magnetic flux from the battery portion is routed away from the receiver
Implementation Method 2
The magnetic shield portion can comprise a high magnetic permeability material
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 for routing magnetic flux away from the receiver when the radio is in operation. The magnetic shield portion can be incorporated into at least one of the battery and the communication device. When the battery is inserted into mobile communication device, the magnetic shield portion is located substantially between a battery portion, in the battery, and the receiver.