Metallic Structure With Gap for Wireless Power Shielding
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Solution Overview
Problem
Electronic devices implanted or worn on the body are vulnerable to damage from external electrical signals and fields, such as X-rays, MRI, and CT scan signals, which can interfere with wireless power transfer and data transmission, necessitating effective shielding to prevent damage and ensure safe operation.
Innovation Solution
A metallic structure with a gap configured to receive wireless charging power at a specific frequency and convey it to a receive circuit while shielding from interference at other frequencies, using first and second connecting feeds, and optionally forming a resonant loop to enhance wireless power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metallic structure is used to shield the receive circuit from external electrical signals and fields, then the shielding effectiveness is improved, but the wireless power transfer efficiency may deteriorate due to interference with the charging field
Solution Approach 1:
The metallic structure is segmented by introducing a gap that extends from a first surface to a second surface, dividing the continuous metallic shielding into sections. This segmentation allows the structure to shield against external interference while permitting the wireless charging field to pass through the gap region, thus resolving the contradiction between shielding effectiveness and power transfer efficiency
Solution Approach 2:
The metallic structure is designed with different properties in different regions: the metallic portions provide shielding against external electrical signals and fields, while the gap region allows wireless power transfer. This local differentiation of properties enables simultaneous achievement of both shielding and efficient power reception
2Object-affected harmful factors
If the metallic structure is made continuous to maximize shielding, then the shielding effectiveness is improved, but the device complexity increases due to potential interference with telemetry and charging operations
Solution Approach 1:
The continuous metallic structure is divided by the gap into separate sections, which simplifies the operational complexity by allowing independent optimization of shielding and power transfer functions without requiring complex control mechanisms to manage interference between shielding and telemetry operations
3Reliability
If shielding is added to protect from external interference, then the reliability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The metallic structure with gap serves multiple functions simultaneously: it provides shielding against external electrical signals and fields, allows wireless power transfer through the gap, and can be integrated into the existing device housing. This multi-functionality improves reliability without proportionally increasing device complexity
Solution Approach 2:
The metallic structure can be implemented as a thin-walled configuration with a gap, providing effective shielding while minimizing the amount of material and structural complexity required. The thin-walled design maintains shielding effectiveness while reducing 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 solution effectively shields internal components from external interference, ensuring reliable wireless power transfer and communication while minimizing damage from unwanted frequencies, thus protecting the devices and maintaining their functionality.
Implementation Method 1
The metallic structure is configured to receive the charging power from a wireless charging field oscillating at a first frequency
Implementation Method 2
The metallic structure is also configured to shield the receive circuit from interference at frequencies other than the first frequency
Implementation Method 3
optionally forming a resonant loop to enhance wireless power transfer efficiency
Data Source
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AI summary
This disclosure provides methods and apparatus for wirelessly transferring power. A first aspect of this disclosure is an apparatus for receiving power wirelessly. The apparatus comprises a receive circuit configured to receive wireless communication and charging power. The apparatus also comprises a metallic structure defining a gap extending from a first surface to a second surface, and through the metallic structure, the first surface opposite the second surface. The metallic structure is configured to receive the charging power from a wireless charging field oscillating at a first frequency. The metallic structure is further configured to convey the received power to the receive circuit via first and second connecting feeds. The metallic structure is also further configured to shield the receive circuit from interference at frequencies other than the first frequency.