Grounded Ferrite Shielding for Low-Noise Wireless Charging
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Solution Overview
Problem
Conventional wireless charging systems face issues with electromagnetic interference and voltage noise due to the semi-conductive nature of ferrites, which affect the operational performance of sensitive components like touch screens and sensors in smaller electronic devices.
Innovation Solution
Grounding the ferrite within the charging system using various mechanisms such as conductive arms, magnets, and e-shields to reduce parasitic capacitance and voltage noise, thereby improving electromagnetic compatibility and touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If ferrite is used in wireless charging systems, then electromagnetic field generation is improved, but voltage noise and electromagnetic interference increase
Solution Approach 1:
A conductive shield is introduced as an intermediary component between the ferrite and the electronic device. This shield acts as a mediator that blocks and redirects electromagnetic fields and voltage noise, preventing them from reaching sensitive components while allowing the ferrite to maintain its electromagnetic field generation function
Solution Approach 2:
The harmful electromagnetic interference and voltage noise are extracted and isolated from the main system by using the conductive shield to contain and redirect these unwanted emissions away from sensitive electronic components
2Volume of moving object
If device size is reduced, then portability is improved, but space for shielding materials is limited
Solution Approach 1:
The conductive shield is implemented as a thin film or flexible structure that can be integrated into the limited space of compact devices. This thin-film approach provides effective electromagnetic shielding while occupying minimal volume, enabling the shield to conform to the constrained geometry of modern portable devices
Solution Approach 2:
The conductive shield is nested within the device structure, positioned between the ferrite and the electronic device components. This nested configuration maximizes the use of available space by placing the shielding material in the gap between existing components rather than adding external bulk
3Object-affected harmful factors
If ferrite is grounded, then voltage noise is reduced, but device complexity increases
Solution Approach 1:
The grounding mechanism is merged with the existing conductive shield structure. The shield serves dual functions: blocking electromagnetic interference and providing a ground path for the ferrite. This integration eliminates the need for separate grounding components, reducing overall device complexity while maintaining voltage noise reduction
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
Significantly reduces peak-to-peak voltage variability and electromagnetic emissions, enhancing regulatory compliance and sensor operation by an order of magnitude, while maintaining efficient charging performance.
Implementation Method 1
The conductive coil may be configured to generate an electromagnetic field from an AC signal
Implementation Method 2
Grounding the ferrite within the charging system using various mechanisms such as conductive arms, magnets, and e-shields to reduce parasitic capacitance and voltage noise
Data Source
AI summary
Charging devices according to embodiments of the present technology may include a housing including an input configured to receive power from a power source and provide power to internal components of the charging device. The charging devices may include a ferrite. The ferrite may be coupled with electrical ground. The charging devices may also include a conductive coil seated in the ferrite. The conductive coil may be configured to generate an electromagnetic field from an AC signal.