Magnetic Wireless Power Transmitter Panel for 15 mm Charging Gaps
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Solution Overview
Problem
Existing wireless power transfer systems are limited to small separation gaps between transmitter and receiver coils, preventing effective charging through furniture or with device cases, and lack compatibility with magnetic connectors, leading to inefficiencies and interoperability issues.
Innovation Solution
A wireless power transmitter with a ferrite core surrounding the antenna on three sides, allowing power transfer up to 15 mm separation, and a removable magnetic connector panel for compatibility with receivers, along with airflow channels for cooling and vehicular power input regulation to protect against surges and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the separation gap between transmitter and receiver coils is increased to enable charging through furniture or with device cases, then the applicability and versatility of wireless power transfer is improved, but the power transfer efficiency and reliability deteriorate
Solution Approach 1:
A ferrite core is introduced as an intermediary material between the transmitter and receiver coils to enhance magnetic field coupling. The ferrite core concentrates and directs magnetic flux across the separation gap, enabling effective power transfer through furniture or device cases while maintaining reliability
Solution Approach 2:
The patent employs composite material structures including ferrite cores combined with coil assemblies to create a transmitter capable of operating across larger separation gaps. The composite structure leverages the magnetic properties of ferrite to maintain efficient power transfer despite increased distance
2Adaptability or versatility
If magnetic connectors are integrated into the wireless power transmitter for compatibility with receivers, then the interoperability is improved, but the device complexity increases due to spacing requirements and potential magnetic interference
Solution Approach 1:
The magnetic connector panel is merged with the transmitter housing structure, integrating the magnetic connection function into the existing device framework. This combination approach enables receiver compatibility while minimizing additional structural complexity
Solution Approach 2:
The magnetic connector is implemented as a separate removable panel that can be independently installed or removed. This segmentation allows the magnetic connection capability to be added without permanently complicating the base transmitter design, maintaining simplicity when the magnetic panel is not used
3Ease of operation
If the separation gap is increased beyond 3-5 mm to accommodate thicker furniture or device cases, then the ease of operation is improved, but thermal management becomes more difficult leading to heating issues
Solution Approach 1:
The ferrite core serves as a thermal management intermediary by providing a path for heat dissipation across the separation gap. The ferrite material conducts heat away from the coil assemblies, preventing excessive temperature buildup even when operating through thicker furniture or device cases
Solution Approach 2:
The transmitter design incorporates localized thermal management features including airflow channels and heat dissipation structures positioned specifically around the coil and ferrite core assemblies. These localized features address thermal issues at their source without requiring system-wide redesign
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 wireless charging across larger gaps and compatibility with magnetic connectors, while mitigating thermal issues and protecting against vehicular power disturbances, enhancing charging speed and reliability.
Implementation Method 1
a ferrite core and defines a cavity, the cavity configured such that the ferrite core substantially surrounds all but the top face of the coil
Implementation Method 2
The removable front plate including at least one magnet, the at least one magnet configured to attract a receiver magnet when a power receiver is proximate to the removable front plate
Implementation Method 3
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Data Source
AI summary
A power transmitter for wireless power transfer includes a control and communications unit, a vehicular power input regulator, an inverter circuit, at least one coil, a shielding, a housing, and a removable front plate. The housing is configured to house, at least in part, one or more of the control and communications unit, the invertor circuit, the at least one coil, the shielding, or combinations thereof. The removable front plate is configured to mechanically connect to the housing, the removable front plate including at least one magnet, the at least one magnet configured to attract a receiver magnet when a power receiver is proximate to the removable front plate.