Orthogonal Coil Printed Circuit for Wireless Power Transfer
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Solution Overview
Problem
Conventional wireless power transfer systems restrict the spatial freedom of the receiving device during charging, as the planar coils must be oriented parallel to each other for efficient power transfer, limiting their use in applications where flexibility in orientation is necessary.
Innovation Solution
The implementation of a multi-directional coil assembly with Z-field, X-field, and Y-field coils, each generating respective vector components of a magnetic field, allowing for wireless power transfer with greater spatial freedom by inducing voltages in the receiving device regardless of orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If planar coils are oriented parallel to each other for efficient power transfer, then power transfer efficiency is improved, but spatial freedom and orientation flexibility are reduced
Solution Approach 1:
The patent divides the magnetic field generation into three separate orthogonal components (X-field coil, Y-field coil, and Z-field coil). Each coil generates magnetic field vectors along one of the three perpendicular axes, allowing independent control of each field component. This segmentation enables the system to maintain efficient power transfer while adapting to various spatial orientations by adjusting the contribution of each orthogonal field component.
Solution Approach 2:
The patent transitions from conventional two-dimensional planar coil arrangements to a three-dimensional orthogonal coil assembly. By introducing coils oriented along all three spatial dimensions (X, Y, and Z axes), the system creates a volumetric magnetic field structure that can couple effectively with receiving coils regardless of their orientation, thereby resolving the contradiction between efficiency and spatial freedom.
2Adaptability or versatility
If multiple devices are charged simultaneously on a charging pad, then device compatibility and versatility are improved, but maintaining proper coil orientation for each device becomes difficult
Solution Approach 1:
The orthogonal coil assembly segments the magnetic field generation into three independent directional components. This allows the system to simultaneously accommodate multiple devices with different orientations by independently adjusting the field strength along each axis, ensuring efficient power transfer to each device regardless of its placement orientation on the charging pad.
Solution Approach 2:
The three-dimensional orthogonal coil assembly provides universal functionality by capable of supporting power transfer to devices in any orientation. The system can function as a multi-directional charging solution that adapts to various device placements, making the charging pad universally compatible while maintaining efficiency across multiple simultaneous charging operations.
3Ease of manufacture
If conventional planar coils are used, then device structure is simple and manufacturing is easy, but spatial freedom and multi-orientation charging are limited
Solution Approach 1:
The patent segments the coil structure into three separate orthogonal components (X-field, Y-field, and Z-field coils) that can be independently manufactured and assembled. Each coil follows a similar planar structure, making them relatively simple to manufacture using standard PCB techniques, while their orthogonal arrangement collectively provides three-dimensional spatial freedom and multi-orientation charging capability.
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
Enables efficient wireless power transfer with increased spatial freedom, accommodating various orientations and applications, including charging of multiple devices simultaneously.
Implementation Method 1
The Z-field coil and the X-field coil are configured to generate respective vector components of a magnetic field
Implementation Method 2
the current generates a magnetic field that induces an alternating voltage within the planar coil of the receiving device that creates an alternating current (AC) within the planar coil
Data Source
AI summary
Printed circuit includes a substrate body having a plurality of substrate layers stacked along a Z-axis. Each substrate layer is substantially planar and extends along an XY plane. The X-, Y-, and Z-axes are mutually perpendicular. The printed circuit also includes a Z-field coil that is coupled to the substrate body and has a conductive trace that is parallel to the XY plane. The printed circuit also includes an X-field coil having conductive trace segments that are coupled to the substrate body and parallel to the XY plane. The X-field coil includes conductive paths that extend substantially parallel to the Z-axis. The conductive paths interconnect the trace segments. The Z-field coil and the X-field coil are configured to generate respective vector components of a magnetic field or have a voltage induced therein by a magnetic field.