Shielded Primary Coil Layout for Wide-Area Wireless Power Transfer
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in power transfer, particularly due to the magnetic fields generated by primary coils, which can affect the performance and safety of wireless power receivers.
Innovation Solution
The wireless power transmission device incorporates primary coils arranged in a specific configuration with a shield to protect the transmitter from magnetic fields and enhance magnetic coupling with secondary coils, allowing for wider area transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If primary coils are used to transmit wireless power through magnetic coupling, then power transmission capability is improved, but magnetic field interference and safety issues worsen
Solution Approach 1:
A shield structure is introduced as an intermediary component between the primary coils and the surrounding environment. The shield, positioned below the primary coils, acts as a mediator that blocks and contains the magnetic fields generated by the coils, preventing harmful magnetic field interference from affecting nearby objects while allowing the primary coils to continue transmitting power effectively.
2Reliability
If a shield is added to protect from magnetic fields, then safety is improved, but device complexity increases
Solution Approach 1:
The shield is implemented as a thin planar structure positioned below the primary coils. This thin-film approach provides effective magnetic field protection while minimizing the addition of bulk and complexity to the overall device structure. The shield's simple geometric form factor reduces manufacturing complexity compared to more complex shielding geometries.
3Productivity
If primary coils are arranged in a specific configuration, then magnetic coupling efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The primary coil system is segmented into multiple individual coils arranged in a specific spatial configuration. This segmentation allows each coil to be manufactured and positioned independently, achieving superior magnetic coupling efficiency through optimized spatial distribution while maintaining manufacturing feasibility through modular assembly of standardized coil components.
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 improves wireless power transmission efficiency and safety by reducing interference from magnetic fields, enabling broader coverage and stable power transfer.
Implementation Method 1
primary coils which transmit the wireless power through magnetic coupling with a secondary coil of the wireless power receiver
Implementation Method 2
a shield which is located below the primary coils and protects the wireless power transmitter from a magnetic field generated from at least one of the primary coils
Data Source
AI summary
A wireless power transfer device transmits wireless power to a wireless power reception device and comprises primary coils, transmitting wireless power by magnetically coupling to secondary coils of the wireless power reception device, and a shield protecting the wireless power transfer device from a magnetic field from at least one of the primary coils. The primary coils comprise: a first bottom coil and a second bottom coil not overlapping each other on a first plane; and a first top coil and a second top coil not overlapping each other on a second plane located above the first plane, wherein one side of the first top coil is located above the first bottom coil, the other side of the first top coil is located above the second bottom coil, and one side of the second top coil is located above the second bottom coil.