Coil Antenna Magnet Orientation to Limit Shielding-Sheet Interference
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Solution Overview
Problem
The disposition of a magnet around a coil in an electronic device for wireless charging can lead to magnetic interference with external shielding sheets, affecting charging efficiency and potentially causing heat generation.
Innovation Solution
The use of a magnet with a perpendicular magnetic structure, comprising a first magnet forming a magnetic field perpendicular to a shielding sheet and a second magnet forming a magnetic field in a different perpendicular direction, to optimize the arrangement of the electronic device and wireless charger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnet is disposed around a coil supporting wireless charging, then the electronic device can be disposed in an attached type wireless charger, but a magnetic field is formed in a direction toward the outside of the electronic device causing interference with a magnetic shielding sheet
Solution Approach 1:
The magnet is divided into multiple magnets arranged around the coil. Each magnet is positioned at specific locations (e.g., four corners) to segment the magnetic field generation, allowing control over the overall magnetic field direction while reducing interference with the shielding sheet.
Solution Approach 2:
Different regions of the magnet structure are designed with different magnetic orientations. The magnets are arranged with specific polarities (e.g., alternating N-S poles) to create localized magnetic field characteristics that collectively achieve the desired external magnetic field direction while minimizing shielding sheet interference.
2Ease of operation
If a magnet is disposed around a coil supporting wireless charging, then the electronic device can be disposed in an attached type wireless charger, but heat generation may occur due to interference with a magnetic shielding sheet
Solution Approach 1:
The magnet is divided into multiple magnets arranged around the coil. Each magnet is positioned at specific locations (e.g., four corners) to segment the magnetic field generation, allowing control over the overall magnetic field direction while minimizing shielding sheet interference.
Solution Approach 2:
Different regions of the magnet structure are designed with different magnetic orientations. The magnets are arranged with specific polarities (e.g., alternating N-S poles) to create localized magnetic field characteristics that collectively achieve the desired external magnetic field direction while minimizing shielding sheet interference.
3Ease of operation
If a magnet is disposed around a coil supporting wireless charging, then the electronic device can be disposed in an attached type wireless charger, but interference with a magnetic shielding sheet of the coil occurs making it difficult to maintain a charging state
Solution Approach 1:
The magnet is divided into multiple magnets arranged around the coil. Each magnet is positioned at specific locations (e.g., four corners) to segment the magnetic field generation, allowing control over the overall magnetic field direction while minimizing shielding sheet interference.
Solution Approach 2:
Different regions of the magnet structure are designed with different magnetic orientations. The magnets are arranged with specific polarities (e.g., alternating N-S poles) to create localized magnetic field characteristics that collectively achieve the desired external magnetic field direction while minimizing shielding sheet interference.
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 charging efficiency by aligning the magnetic fields to minimize interference with shielding sheets, ensuring stable charging and reducing heat generation.
Implementation Method 1
a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil. The first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in a first direction. The second magnet is coupled with the first magnet in a third direction that is an outside direction from a center of the coil antenna and is disposed so that a portion of magnetism induced by the second magnet is formed in a second direction perpendicular to the first direction.
Data Source
AI summary
A power reception device includes: a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a coil antenna wound in a circle; a shielding sheet disposed over the coil antenna; and a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil. The first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in the first direction. The second magnet is disposed so that a portion of the magnetism induced by the second magnet is formed in a third direction that is an outside direction from a center of the coil antenna.