Inductive Charging Coil Embedded in Device Wall
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Solution Overview
Problem
The existing wireless charging solutions for portable electronic devices often require additional space for the receiving coil, making the devices bulkier and reducing space for other components, and there is a need to minimize this space usage while maintaining efficient charging capabilities.
Innovation Solution
The integration of an inductive charging coil assembly within the device housing, where the coil is partially embedded into the wall and configured with concentric loops and electrical leads that reduce the overall thickness and optimize space usage, including a shield for capacitive noise reduction and efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a receiving coil is added for wireless charging, then wireless charging capability is improved, but device volume increases
Solution Approach 1:
The receiving coil is embedded within the device housing wall, nesting the coil structure inside the existing housing volume rather than adding it as a separate external component. This allows the coil to be accommodated within the wall thickness, minimizing additional device volume while enabling wireless charging capability.
Solution Approach 2:
The receiving coil is positioned in a plane within the housing wall rather than extending outward in the third dimension. By configuring the coil to lie flat within the wall structure and routing leads through channels in the wall, the design transforms a potentially volumetric component into a planar integration, reducing overall device thickness.
2Volume of moving object
If the receiving coil is embedded in the housing wall, then space for other components is improved, but manufacturing complexity increases
Solution Approach 1:
The housing wall is segmented to include dedicated channels for routing electrical leads. This segmentation separates the lead routing path from the coil winding area, allowing independent optimization of each component's placement and simplifying the assembly process by providing pre-defined pathways for electrical connections.
Solution Approach 2:
Channels are pre-formed in the housing wall structure before coil installation. This preliminary action of creating lead pathways in advance simplifies subsequent coil installation and lead connection, reducing manufacturing complexity compared to creating pathways after assembly.
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 allows for efficient wireless charging without significantly increasing the device's size, maintaining space for other components and enhancing charging efficiency through the use of stranded wires and a capacitive shield, ensuring effective power transfer and reduced capacitive noise.
Implementation Method 1
A transmitter coil disposed below the charging surface may produce a time-varying magnetic flux that induces a current in a corresponding receiving coil in the portable electronic device
Implementation Method 2
The inductive coil assembly includes a shield for capacitive noise reduction
Data Source
AI summary
This disclosure describes a portable electronic device that includes an inductive charging receiver for receiving power wireless from a charging device. The portable electronic device includes a device housing including a wall having a channel formed in an interior-facing surface of the wall. The portable electronic device also includes an inductive coil assembly for receiving power wirelessly that is coupled to the interior facing surface. The inductive coil assembly is a flat coil that includes concentric loops of electrically conductive material that define a central opening. A first electrical lead extends away from a peripheral portion of the flat coil and a second electrical lead extends from the central opening, into the channel formed in the back wall and beneath one side of the concentric loops.