Wireless Charging Station Multi-Loop Coil Design
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Solution Overview
Problem
Existing wireless charging systems require electronic devices to be placed in specific orientations and positions on charging surfaces, limiting flexibility and efficiency due to the use of single-axis magnetic fields and specific charging regions.
Innovation Solution
An array of transmitter coils generating time-varying magnetic fields across a vast majority of the charging surface, allowing devices to be charged in any position and orientation through a multi-dimensional receiver coil system, with overlapping magnetic fields bridging between coils to maintain field strength across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single transmitter coil is used to generate magnetic fields, then the device structure is simple, but the charging area is limited and precise alignment is required
Solution Approach 1:
The transmitter coil is divided into multiple independent loop portions (first loop portion, second loop portion, third loop portion, fourth loop portion) that can generate magnetic fields in different directions. Each loop portion can be independently controlled to create multi-directional magnetic field coverage, expanding the effective charging area without requiring a completely new transmitter design.
Solution Approach 2:
The patent introduces multi-dimensional magnetic field generation by arranging loop portions in different orientations (first and second loops in one plane, third and fourth loops in another plane). This dimensional arrangement allows the system to provide magnetic field coverage in multiple spatial dimensions, enabling charging across a larger area and reducing alignment requirements.
2Adaptability or versatility
If transmitter and receiver coils are disposed on parallel planes, then the magnetic field alignment is simple, but the device must be positioned in a particular orientation
Solution Approach 1:
The receiver coil is designed with loop portions in multiple dimensions (first and second loops in one plane, third and fourth loops in another plane), allowing it to detect and respond to magnetic fields from various orientations. This multi-dimensional structure enables the receiver to function effectively regardless of the device's positioning angle on the charging surface.
Solution Approach 2:
The receiver coil structure is designed to perform multiple functions: it can detect magnetic fields from different directions, accommodate various device orientations, and maintain efficient power transfer across different positioning scenarios. This universal design eliminates the need for precise alignment while maintaining charging effectiveness.
3Area of stationary object
If an array of transmitter coils is used to cover a vast majority of the charging surface, then the charging area is expanded, but the device complexity and manufacturing cost increase
Solution Approach 1:
The transmitter is segmented into multiple loop portions that can be manufactured as separate components and then assembled into the final array configuration. This segmentation allows for modular manufacturing, where each loop portion can be produced using standard coil winding techniques and then integrated into the charging surface, reducing overall manufacturing complexity.
Solution Approach 2:
Multiple loop portions are combined into a single integrated transmitter system that shares common control electronics and power supply. This merging approach reduces the need for separate control systems for each coil, simplifying the overall device architecture and reducing manufacturing complexity while maintaining extensive charging surface coverage.
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 wireless charging across a large area of the charging surface, allowing devices to be charged regardless of orientation or position, reducing the need for precise alignment and enhancing charging flexibility and efficiency.
Implementation Method 1
Magnetic fields generated by transmitters disposed below the charging surface may induce corresponding currents in receivers that have a corresponding inductive coil
Implementation Method 2
The induced currents may be used by the electronic device to charge an internal battery
Data Source
AI summary
A wireless charging system including a transmitter and a receiver. The transmitter is formed of a coil of wire that includes a first loop portion, a second loop portion, and a crossing portion. The crossing portion electrically couples the first loop portion and the second loop portion such that when current is generated in the coil, electrical current flows through the first loop portion in a different rotational direction than in the second loop portion. The receiver is formed of a ferromagnetic core and multiple (e.g., three) coils disposed about the ferromagnetic core. Each coil may be disposed about a different axis of the core such that current may be induced in at least one of the coils by a magnetic field in any direction.