Wireless Power Transfer Coil Shielding for Radio Interference
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Solution Overview
Problem
Existing wireless power transfer apparatuses experience interference with radio communication due to high-frequency magnetic fields generated by the primary coil, which affects the communication between the power-transmitting and receiving units.
Innovation Solution
Incorporating a first magnetic shield member made of an electric conductor between the communication device and the coil, and a second magnetic shield member on the communication device's surfaces, to reduce the interference from high-frequency magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the communication device is disposed near the coil for compact design, then device complexity is reduced, but radio communication is interfered with by high-frequency magnetic fields
Solution Approach 1:
A magnetic shield member is introduced as an intermediary component between the coil and the communication device. This shield member blocks the high-frequency magnetic fields generated by the coil from reaching the communication device, thereby eliminating the harmful interference while allowing both components to remain in close proximity for compact design.
Solution Approach 2:
The magnetic shield member is extracted as a separate functional component from the existing structure. By isolating the shielding function into a dedicated element, the solution effectively separates the harmful magnetic fields from the communication device without requiring redesign of the entire system architecture.
2Object-affected harmful factors
If magnetic shield members are added to block high-frequency magnetic fields, then radio communication interference is reduced, but device complexity increases
Solution Approach 1:
The magnetic shield member is implemented as a thin-walled cylindrical structure that provides effective magnetic field blocking while maintaining a compact and simple overall form. This thin-walled design minimizes the additional structural complexity while achieving the desired shielding effect.
Solution Approach 2:
The magnetic shield member serves multiple functions simultaneously: it blocks high-frequency magnetic fields from interfering with radio communication, provides structural support for mounting the communication device, and maintains the compact cylindrical form factor of the wireless power transfer apparatus.
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 effectively minimizes the interference with radio communication between the power receiving apparatus and the communication device, enhancing the quality of communication by shielding the high-frequency magnetic fields.
Implementation Method 1
a first magnetic shield member made of an electric conductor, the first magnetic shield member being disposed between the communication device and the coil
Implementation Method 2
a coil disposed below the support and configured to generate a high-frequency magnetic field upon receiving supply of a high-frequency current
Implementation Method 3
a second magnetic shield member made of an electric conductor or a magnetic body, the second magnetic shield member being disposed on at least one of a lower surface and a lateral surface of the communication device
Data Source
AI summary
A wireless power transfer apparatus according to the present invention is a wireless power transfer apparatus for transferring power to a power receiving apparatus. The wireless power transfer apparatus includes a support on which the power receiving apparatus is placed, a coil disposed below the support, the coil generating a high-frequency magnetic field upon receiving supply of a high-frequency current, a communication device disposed below the support to perform radio communication with the power receiving apparatus, a first magnetic shield member made of an electric conductor, the first magnetic shield member being disposed between the communication device and the coil, and a second magnetic shield member made of an electric conductor or a magnetic body, the second magnetic shield member being disposed on at least one of a lower surface and a lateral surface of the communication device.