Stylus Box Coil Layout for Higher Wireless Charging Coupling
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Solution Overview
Problem
Current wireless charging systems for styluses have low coupling coefficients between transmit and receive coils, resulting in inefficient charging due to parallel alignment of magnetic cores, leading to a significant leakage of magnetic fields and reduced charging efficiency.
Innovation Solution
The implementation of a wireless charging system with series-connected transmit coils in the terminal device and receive coils in the stylus, where the magnetic cores are positioned to face each other directly, increasing the coupling coefficient by optimizing the alignment and orientation of the coils to enhance magnetic field coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the magnetic cores of the transmit coil and receive coil are placed opposite and parallel to each other in conventional wireless charging, then the structure is simple, but the coupling coefficient is low and wireless charging efficiency is reduced
Solution Approach 1:
The patent changes the spatial arrangement of magnetic cores from a parallel configuration to a face-to-face configuration. The first and second transmit coils are positioned on opposite sides of the accommodating groove with their magnetic core end faces directed toward each other, creating a perpendicular magnetic field path that significantly improves coupling with the receive coil in the stylus.
Solution Approach 2:
The patent combines two transmit coils in series connection, with both coils positioned to face the accommodating groove. This merging of two coil systems creates a stronger combined magnetic field and improves the overall coupling coefficient between the transmit and receive coils, thereby enhancing wireless charging efficiency.
2Device complexity
If a single transmit coil is used in the terminal device, then the device complexity is low, but the coupling coefficient with the receive coil is insufficient
Solution Approach 1:
The patent combines two transmit coils in series connection, with both coils positioned to face the accommodating groove. This merging of two coil systems creates a stronger combined magnetic field and improves the overall coupling coefficient between the transmit and receive coils, thereby enhancing wireless charging efficiency.
Solution Approach 2:
The patent changes the spatial arrangement of magnetic cores from a parallel configuration to a face-to-face configuration. The first and second transmit coils are positioned on opposite sides of the accommodating groove with their magnetic core end faces directed toward each other, creating a perpendicular magnetic field path that significantly improves coupling with the receive coil in the stylus.
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 significantly improves wireless charging efficiency by increasing the coupling coefficient between the transmit and receive coils, allowing for more effective energy transfer and faster charging of the stylus.
Implementation Method 1
The first transmit coil is configured to provide a first alternating electromagnetic field to the first receive coil after the stylus is placed in the first accommodating groove. The first receive coil is configured to generate a first alternating current electrical signal by inducing the first alternating electromagnetic field provided by the first transmit coil
Implementation Method 2
after the stylus is placed in the first accommodating groove, the end face that is of the magnetic core in the first transmit coil and that faces the first accommodating groove and an end face that is of the magnetic core in the first receive coil and that faces the first transmit coil coupled to the first receive coil have at least regions partially disposed directly opposite to each other
Data Source
AI summary
A wireless charging system and a wireless charging stylus box. The wireless charging system includes a wireless charging device and a stylus. The wireless charging device includes an accommodating groove and a transmit coil. The stylus includes a stylus body and a receive coil, and an end face of a magnetic core in the receive coil faces a sidewall of the stylus body, so that after the stylus is placed in the accommodating groove, the end face that is of the magnetic core in the transmit coil and that faces the accommodating groove and an end face that is of the magnetic core in the receive coil and that faces the transmit coil coupled to the receive coil have at least regions partially disposed directly opposite to each other.