Removable Magnetic Connector Panel for Extended-Gap Wireless Charging
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Solution Overview
Problem
Existing wireless power transmitters are limited to a maximum coil-to-coil separation gap of about 3-5 mm, restricting their operational range and compatibility with thicker objects or devices with cases, which hinders commercial applications requiring extended separation gaps.
Innovation Solution
The development of a wireless power transmitter capable of operating at an extended separation gap of up to 15 mm or more, utilizing a ferrite core that surrounds the transmitter antenna on three sides, and incorporating a removable front plate with magnets for alignment and interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the separation gap between transmitter coil and receiver coil is increased beyond 3-5 mm, then the operational range and compatibility with thicker objects are improved, but the power transfer efficiency and thermal performance deteriorate
Solution Approach 1:
A ferrite core is introduced as an intermediary material between the transmitter coil and receiver coil. The ferrite core concentrates and guides magnetic flux, enabling effective magnetic coupling even when the separation gap is increased beyond the conventional 3-5 mm, thus maintaining power transfer efficiency at extended distances
Solution Approach 2:
The system changes the magnetic permeability parameter by introducing ferrite material with high magnetic permeability. This parameter change allows the magnetic field to penetrate through larger gaps effectively, enabling operation at separation distances of 10 mm or more while maintaining acceptable power transfer efficiency
2Ease of operation
If magnetic connectors are added to the transmitter for alignment and connection, then the ease of operation and alignment are improved, but the device complexity increases
Solution Approach 1:
The magnetic connector is merged with the ferrite core assembly, combining the alignment function and the magnetic flux concentration function into a single integrated component. This reduces the overall device complexity while maintaining the alignment benefit
Solution Approach 2:
The ferrite core serves multiple functions: it concentrates magnetic flux for efficient power transfer, provides structural support, and when combined with magnetic connectors, enables alignment and connection functions. This multi-functionality reduces the need for separate components, thereby managing 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
This solution enables wireless power transfer over larger separation gaps while maintaining satisfactory performance, including thermal management, transfer speed, and efficiency, thereby expanding the range of commercial applications for wireless power technology.
Implementation Method 1
The shielding includes 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
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
Implementation Method 3
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
Data Source
AI summary
A power transmitter for wireless power transfer includes a control and communications unit, 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.