3D Receiver Coil Layout for Compact Wireless Power Reception
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Solution Overview
Problem
Portable devices with three-dimensional complex structures, such as hearing aids, face challenges in achieving efficient wireless power reception due to the limited size of circular receiver coils and the complexity of their structure, leading to reduced power reception efficiency and increased electromagnetic noise.
Innovation Solution
A wireless power receiver device with a receiver loop coil, electronic circuit substrate, load circuit, and magnetic sheet, where the magnetic sheet is positioned to surround the electronic circuit and load circuit within the housing, forming a magnetic path that enhances flux linkage with the receiver loop coil, reducing electromagnetic noise and increasing power reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular receiver coil is used in a three-dimensional complex structure body, then the device can be manufactured with simple coil geometry, but the received power is insufficient due to size limitations imposed by the complex structure
Solution Approach 1:
The receiver coil is transformed from a two-dimensional circular shape to a three-dimensional complex shape that conforms to the housing surface. The coil is configured to bend and follow the contours of the three-dimensional housing, utilizing spatial dimensionality to increase the effective coil area and improve magnetic flux linkage without being constrained by planar geometry limitations
2Volume of moving object
If the receiver coil is made small to fit within the three-dimensional complex structure, then the device size is reduced, but the received power decreases due to reduced coil area
Solution Approach 1:
The receiver coil is nested within the three-dimensional housing structure, conforming to its inner or outer surfaces. This nesting approach allows the coil to utilize the available spatial volume efficiently, maximizing the coil area within the constrained device envelope while maintaining compact overall dimensions
Solution Approach 2:
By transitioning from a flat circular coil to a three-dimensional coil that follows the housing contours, the effective area is increased without proportionally increasing the device volume. The coil utilizes the vertical and lateral dimensions of the housing to create a larger magnetic coupling area within the same spatial footprint
3Area of moving object
If a three-dimensional receiver coil bending along the housing surface is used, then the coil area is increased, but magnetic flux linkage is reduced due to flux cancellation from opposite vectors
Solution Approach 1:
The three-dimensional coil is designed with non-uniform winding density and orientation along its path. By varying the local winding characteristics according to the housing geometry, the coil optimizes magnetic flux linkage in different regions while compensating for flux cancellation effects through localized adjustments in winding direction and density
Solution Approach 2:
The coil configuration is dynamically optimized to adapt to the magnetic field distribution. The winding pattern is designed to follow field lines and maintain consistent flux linkage direction, transforming the static geometric constraint into a dynamic field-adaptive structure that maximizes power reception efficiency
4Power
If external magnetic field energy is increased to obtain sufficient received power, then power reception improves, but electromagnetic noise increases causing electronic circuit malfunction
Solution Approach 1:
A magnetic shielding structure is introduced as an intermediary element between the receiver coil and the electronic circuit. This shielding component selectively guides and contains the magnetic flux, allowing strong magnetic fields for power reception while blocking or redirecting electromagnetic noise away from sensitive electronic circuits, thus decoupling the power reception field from the noise-affecting field
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 enables efficient power reception in devices with complex structures while minimizing electromagnetic noise, ensuring reliable operation and reducing the risk of component damage.
Implementation Method 1
form the magnetic path of the main magnetic flux, which is linked with the receiver loop coil
Implementation Method 2
The magnetic sheet is disposed in the inner space of the receiver loop coil three-dimensionally at such a position that the magnetic sheet surrounds the electronic circuit substrate and the load circuit
Data Source
AI summary
A wireless power receiver device includes a receiver coil, an electronic circuit, a load circuit, a magnetic sheet, and a housing. The magnetic sheet is disposed with respect to the receiver coil. The housing, in which the receiver coil, the electronic circuit, the load circuit, and the magnetic sheet are disposed, has a three-dimensional complex structure body. The receiver coil has a shape having multiple curvatures and bending three-dimensionally along the outer surface or the inner surface of the three-dimensionally structured housing. The magnetic sheet is disposed in the inner space of the receiver coil three-dimensionally at such a position that the magnetic sheet surrounds the electronic circuit and the load circuit, so as to form the magnetic path of the main magnetic flux, which is linked with the receiver coil, with respect to a magnetic field from the outside of the three-dimensionally structured housing.