Power Transmission Coil Shielding for Wireless Charging
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Solution Overview
Problem
Conventional power transmission units face challenges in preventing size increase and communication quality deterioration due to magnetic forces generated by power transmission coils, particularly when using annular communication antennas.
Innovation Solution
A power transmission unit design incorporating a power transmission coil with a spiral winding, a magnetic member, and an annular shielding member arranged between the coil and communication part to shield magnetic forces, along with a specific configuration of inner and outer members to maintain unit size and communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding member is added to prevent magnetic force from influencing the communication part, then communication quality is improved, but the device complexity increases
Solution Approach 1:
A shielding member made of magnetic shielding material is positioned between the power transmission coil and the communication part to block magnetic force from reaching the communication antenna, thereby preventing communication quality deterioration while maintaining device functionality
Solution Approach 2:
The communication part is designed as an annular antenna that surrounds the power transmission coil, allowing it to perform both communication function and serving as a structural element of the device housing, reducing the need for additional separate components
2Volume of stationary object
If the communication part is arranged to surround the power transmission coil, then the unit size is minimized, but magnetic force from the coil may influence communication
Solution Approach 1:
A shielding member made of magnetic shielding material is positioned between the power transmission coil and the communication part to block magnetic force from reaching the communication antenna, thereby preventing communication quality deterioration while maintaining device functionality
Solution Approach 2:
The communication antenna is arranged in an annular shape surrounding the power transmission coil in the radial direction, while the shielding member is positioned in the axial direction between the coil and antenna, utilizing different spatial dimensions to achieve both compact size and magnetic isolation
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
The solution effectively prevents size increase and maintains communication quality by shielding magnetic forces, ensuring efficient power transmission and reception while minimizing signal loss.
Implementation Method 1
a shielding member that is formed in an annular shape about the axis, arranged between the power transmission coil and the communication part in an intersecting direction intersecting with the axis, and shields magnetic force generated by the power transmission coil
Implementation Method 2
a power transmission coil that transmits electric power in a non-contact manner
Data Source
AI summary
A power transmission unit includes: a power transmission coil; a communication coupler that is formed in an annular shape about an axis X and arranged to surround the power transmission coil; and a shielding member that is formed in an annular shape about the axis X, and arranged between the power transmission coil and the communication coupler in an intersecting direction. The shielding member is arranged at a position along the intersecting direction to surround the power transmission coil, and shields magnetic force generated by the power transmission coil.