Magnetic Coil Winding Density for Wireless Charging Uniformity
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies due to non-uniform magnetic fields generated by coils, which are affected by misalignment, leading to suboptimal power transfer and user experience.
Innovation Solution
A method and system for evaluating magnetic field uniformity using a near-field scanning tool, spectrum analyzer, and computer system to measure and analyze the magnetic field signals, determining the uniformity by calculating the gradient and magnitude differences within a defined charging area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coil is used for wireless charging, then the system structure is simple, but the magnetic field uniformity is poor leading to inefficient power transfer when misaligned
Solution Approach 1:
The magnetic coil is designed with non-uniform winding density where the winding density increases from the center toward the edges, creating different local magnetic field characteristics. This local quality variation compensates for misalignment effects and improves both power transfer efficiency and device placement flexibility simultaneously
2Ease of operation
If the magnetic field uniformity is improved to allow free device placement, then the user experience is enhanced, but the coil design complexity increases
Solution Approach 1:
The coil design changes the winding density parameter spatially, creating a gradient from center to edge. This parameter variation achieves improved magnetic field uniformity and device placement flexibility without requiring complex multi-component structures, thus limiting the increase in device complexity
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
Ensures high magnetic field uniformity, allowing for efficient power transfer and flexible device placement during charging, enhancing user experience and charging efficiency.
Implementation Method 1
In a wireless charging system, particularly an inductive wireless charging system, energy is transferred from one or more power transmitter (TX) coils to one or more power receiver (RX) coils through a coupling of a magnetic field
Implementation Method 2
scanning and obtaining a set of signals of the magnetic field by moving a measurement probe of a scanning tool point by point within a scanning region of the magnetic field
Data Source
AI summary
A method for evaluating a uniformity of a magnetic field generated by a magnetic coil is disclosed. The method may include providing an electrical current to the magnetic coil to generate a magnetic field; scanning and obtaining a set of signals of the magnetic field by moving a measurement probe of a scanning tool point by point within a scanning region of the magnetic field and at a scanning height; performing a spectrum analysis on the set of signals by a spectrum analyzer to extract spectrum information of the magnetic field; transferring the set of signals and the extracted spectrum information to a computer system; selecting signals of the magnetic field with one or more frequencies from the set of signals based on the extracted spectrum information by the computer system; and analyzing the uniformity of the magnetic field by analyzing the selected signals by the computer system.