Wireless Power Transmission Structures for Simultaneous Device Charging
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Solution Overview
Problem
Current wireless power transfer systems struggle to simultaneously charge both mobile devices and wearable devices effectively, particularly in accommodating the unique positioning and power requirements of these devices.
Innovation Solution
A wireless power transfer apparatus with a support structure that includes upper and lower transmit coils with current flowing in opposite directions, producing constructively interfering magnetic fields to wirelessly transmit power to both mobile and wearable devices, allowing for simultaneous charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single charging pad surface is used for wireless power transfer, then the system structure is simple, but it cannot simultaneously accommodate both mobile devices and wearable devices for effective charging
Solution Approach 1:
The charging pad is divided into multiple independent charging surfaces: a top surface with an upper coil for mobile devices and a side surface with a lower coil for wearable devices. This segmentation allows each surface to be optimized for specific device types while maintaining overall system functionality.
Solution Approach 2:
The invention transitions from a single-planar charging surface to a multi-dimensional structure by utilizing both the top surface and side surface of the charging pad. This dimensional expansion enables simultaneous charging of devices placed in different spatial orientations.
2Adaptability or versatility
If multiple transmit coils are used to charge multiple devices simultaneously, then device compatibility improves, but magnetic field interference increases
Solution Approach 1:
Each transmit coil is positioned and oriented to create a localized magnetic field optimized for its specific charging surface. The upper coil generates a magnetic field concentrated at the top surface for mobile devices, while the lower coil creates a separate magnetic field zone at the side surface for wearable devices, minimizing cross-interference.
Solution Approach 2:
The support structure acts as an intermediary element that physically separates and spatially isolates the two transmit coils. This structural mediation prevents direct magnetic field coupling between coils while maintaining electrical independence, thereby reducing harmful interference.
3Power
If transmit coils are positioned for optimal mobile device charging, then mobile device power transfer efficiency is high, but wearable device charging capability is lost
Solution Approach 1:
The charging pad is designed with multi-functional capability through separate charging surfaces: the top surface universally supports mobile devices with larger power requirements, while the side surface universally accommodates wearable devices with different power and positioning needs. Each surface functions independently yet contributes to the overall universal charging capability.
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
Enables efficient and effective simultaneous charging of mobile and wearable devices, ensuring uniform power transmission across various angular positions and distances, suitable for magnetic resonance systems and accommodating devices in cavities.
Implementation Method 1
an upper transmit coil and a lower transmit coil within the support structure, the upper and lower transmit coils having current that flows in opposite directions to produce magnetic fields that constructively interfere with one another at the side surface
Data Source
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AI summary
A wireless power transfer apparatus includes a support structure having a top surface and a side surface. The support structure is configured to support a mobile device on the top surface and a wearable device at the side surface. The wireless power transfer apparatus also includes a plurality of transmit coils within the support structure. The plurality of transmit coils are configured to wirelessly transmit power to the mobile device on the top surface and the wearable device at the side surface.