Wireless Charging Case Gap Structure for Thermal Isolation
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Solution Overview
Problem
The reduced size of truly wireless stereo (TWS) headphone charging cases exacerbates heat dissipation issues due to increased heat conductivity from wireless charging, which can shorten battery life and lead to longer charge times.
Innovation Solution
Designing electronic devices with a housing that includes gaps between the device and the wireless power transmitter to reduce heat conduction and facilitate air circulation for thermal management, allowing for faster charge times and longer battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the charging case size is reduced, then the portability and compactness are improved, but the heat dissipation capability deteriorates due to increased heat conductivity from wireless charging
Solution Approach 1:
The bottom surface of the charging case is segmented into multiple regions with different geometries (concave, convex, flat portions) to create gaps that divide the heat transfer path, reducing overall heat conduction from the wireless power transmitter to the battery
Solution Approach 2:
The patent introduces a spatial dimension by creating non-planar surfaces (concave and convex portions) on the charging case bottom, transforming a 2D contact problem into a 3D gap structure that reduces thermal contact area while maintaining wireless charging functionality
2Volume of moving object
If the charging case size is reduced, then the portability is improved, but the charge time increases due to heat-related charging limitations
Solution Approach 1:
By segmenting the contact surface into multiple geometric portions, the patent reduces thermal contact area and improves heat dissipation, enabling faster charging without exceeding thermal limits in compact devices
3Temperature
If gaps are introduced between the charging case and wireless power transmitter, then the heat transfer is reduced, but the wireless charging efficiency may deteriorate
Solution Approach 1:
The patent applies local quality by creating specific geometric features (concave and convex portions) in specific locations on the charging case bottom, allowing gaps to be formed only where needed to reduce heat transfer while maintaining good magnetic coupling for wireless charging in other areas
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 use of gaps between the device and the wireless power transmitter reduces heat transfer, achieving lower internal temperatures and potentially longer battery life without the need for additional thermal management solutions.
Implementation Method 1
A receive power coil is positioned within the housing and configured to receive wireless power from a transmit power coil of a wireless power transmitter
Implementation Method 2
gaps between the device and the wireless power transmitter to reduce heat conduction
Implementation Method 3
facilitate air circulation for thermal management
Data Source
AI summary
Gaps between transmitters and receivers in wireless power systems and related systems, methods, and devices are disclosed. A housing includes an internal surface configured to face a receive power coil and an external surface configured to face a wireless power transmitter. The external surface is shaped to define one or more gaps between the external surface and a surface of the wireless power transmitter responsive to placement of the external surface into engagement with the surface of the wireless power transmitter. An electronic device includes a receive power coil and a barrier including an internal surface facing the receive power coil and an external surface configured to face a transmit power coil. The external surface defines a gap between the external surface and a surface of the wireless power transmitter responsive to placement of the external surface in engagement with the surface of the wireless power transmitter.