Segmented Magnetic Core Antenna for Wearable Power Transfer
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Solution Overview
Problem
Conventional contactless power supply antenna devices face challenges in reducing overall size, particularly when mounted on wearable terminals, limiting power transmission efficiency.
Innovation Solution
The antenna device comprises a power transmission antenna with a magnetic core of two facing magnetic plates connected by a magnetic material-containing portion and a space between them, where a power transmission coil is disposed on one plate, and a power reception antenna that can be positioned in this space, enhancing magnetic coupling and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional antenna devices use a feed line and a coil wound around a core surrounding the feed line, then power transmission efficiency is improved, but the overall size of the antenna device increases
Solution Approach 1:
The magnetic core is segmented into two separate magnetic plates that face each other with a space between them, rather than using a single continuous core structure. This segmentation allows the reception antenna to be positioned in the space between the plates, optimizing magnetic coupling while reducing the overall volume of the antenna device.
Solution Approach 2:
The reception antenna is nested within the space formed by the two magnetic plates of the transmission antenna. This nested configuration allows both antennas to occupy a compact volume while maintaining effective magnetic coupling, thereby reducing the overall size of the antenna device without sacrificing power transmission efficiency.
2Adaptability or versatility
If the antenna device size is reduced to fit wearable terminals, then adaptability to wearable devices is improved, but power transmission efficiency deteriorates
Solution Approach 1:
The magnetic flux density is locally concentrated in the space between the two magnetic plates where the reception antenna is positioned. This local concentration of magnetic flux enhances the magnetic coupling coefficient between transmission and reception antennas, maintaining high power transmission efficiency even in the reduced volume suitable for wearable terminals.
Solution Approach 2:
The invention transitions from a traditional single-core three-dimensional structure to a two-plate configuration with a defined space between them. This dimensional reorganization allows the reception antenna to be optimally positioned in the inter-plate space, achieving efficient magnetic coupling within a compact footprint suitable for wearable devices.
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 increases the coupling coefficient and power transmission and reception efficiency, enabling higher power transfer within the limited volume constraints of wearable devices.
Implementation Method 1
contactless power supply through electromagnetic induction
Implementation Method 2
magnetic core including two magnetic plates that face each other
Data Source
AI summary
Provided is a contactless power supply antenna device that has raised power transmission efficiency while also enabling size-reduction for mounting on a wearable terminal or the like. The antenna device includes a power transmission antenna (2) and a power reception antenna (3). The power transmission antenna (2) includes: a magnetic core including two magnetic plates (21) that face each other, a magnetic material-containing connecting portion (22) that connects at least part of an end section of each of the two magnetic plates (21), and a space (23) between the two magnetic plates (21); and a power transmission coil (25) disposed on at least one of the two magnetic plates (21) at a side thereof that faces the space (23). The power reception antenna (3) includes a power reception coil (31) and is positionable in the space (23).