Vertical Magnet Modules Around Coil Antennas to Limit Shield Saturation
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Solution Overview
Problem
The existing electronic devices face challenges in increasing the efficiency of coil antennas due to magnetic flux induction into shielding members, which reduces the magnetic-field shielding function and decreases the efficiency of the coil antenna. Additionally, there is a limitation in space for mounting magnet modules in compact electronic devices.
Innovation Solution
The electronic device incorporates a battery, a coil antenna, a shield, and a plurality of magnet modules that are vertically disposed on the side surface of the coil antenna. Each magnet module has an inner and outer part with specific polarity configurations and a non-magnetized area between them, which reduces magnetic flux induction into the shielding member and allows for efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnet modules are disposed horizontally on the side surface of the coil antenna, then the external electronic device can be attached and rotated, but magnetic flux is induced to the shielding member causing saturation and reducing shielding function
Solution Approach 1:
The magnet modules are disposed vertically along the side surface of the coil antenna rather than horizontally, changing the orientation from horizontal to vertical dimension. This vertical arrangement allows the magnetic flux to be directed away from the shielding member, preventing saturation while maintaining the attachment and rotation functionality of external electronic devices.
Solution Approach 2:
The magnet modules are configured with asymmetric polarity arrangements where adjacent magnet modules have opposite polarities (N-S-N-S pattern). This asymmetric polarity configuration creates a magnetic flux distribution that avoids inducing flux into the shielding member, thereby preventing saturation while maintaining attachment capability.
2Stability of the object's composition
If magnet modules are disposed horizontally with equal N and S pole areas, then magnetic symmetry is achieved, but space for mounting is insufficient in compact devices
Solution Approach 1:
The magnet modules are arranged vertically along the side surface rather than horizontally, utilizing the vertical dimension of the coil antenna. This vertical arrangement reduces the horizontal space requirement while maintaining magnetic functionality, thereby solving the space limitation in compact devices.
Solution Approach 2:
Different regions of the magnet modules have different polarity assignments (N-S-N-S pattern) rather than uniform symmetry. This local quality variation in polarity configuration maintains the necessary magnetic field characteristics while adapting to the limited mounting space in compact electronic devices.
3Adaptability or versatility
If magnet modules are disposed on the side surface of the coil antenna, then attachment function is enabled, but magnetic flux induces eddy currents in electrical components reducing coil antenna efficiency
Solution Approach 1:
The vertical disposition of magnet modules along the side surface directs the magnetic flux in a vertical direction, away from the shielding member and electrical components on the rear surface. This dimensional change in magnet arrangement prevents eddy current induction in electrical components, reducing energy loss while maintaining attachment function.
Solution Approach 2:
The asymmetric N-S-N-S polarity pattern creates a specific magnetic flux distribution that channels flux away from sensitive electrical components. This asymmetric configuration reduces eddy current losses in electrical components while preserving the attachment capability of the magnet modules.
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 vertical disposition of magnet modules decreases magnetic flux induced to the shielding member, reducing saturation and maintaining the magnetic-field shielding function. This enhances the efficiency of the coil antenna and reduces space limitations for mounting magnet modules in compact devices.
Implementation Method 1
magnetic flux generated from the plurality of magnet modules may be induced to the shielding member
Implementation Method 2
The coil antenna may transmit power according to an international standard set by the Wireless Power Consortium (WPC)
Implementation Method 3
A shielding member may be disposed on one surface of the coil antenna to reduce a phenomenon in which the coil antenna interferes with another coil antenna or a magnetic field radiated from the coil antenna is lost by a metal part in the electronic device
Implementation Method 4
the magnetic field generated from the coil antenna may cause eddy currents in an electrical component or a metal part of the electronic device disposed on the rear surface of the coil antenna
Data Source
AI summary
An example electronic device includes a battery, a coil antenna that transmits power of the battery, a shield disposed on a lower surface of the coil antenna, and a plurality of magnet modules formed to surround at least a portion of a side surface of the coil antenna. Each of the plurality of magnet modules includes an inner part that faces toward the side surface of the coil antenna, an outer part that faces toward an opposite side to the coil antenna, and a non-magnetized area disposed between the inner part and the outer part. The inner part includes a first inner area and a second inner area over the first inner area, and the outer part includes a first outer area and a second outer area over the first outer area. The first inner area and the second outer area are magnetized with a first polarity, and the second inner area and the first outer area are magnetized with a second polarity opposite to the first polarity.