Wireless Charging Circuit With Position-Selected Coils for Stylus Mobility
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Solution Overview
Problem
Conventional wireless charging technologies require the stylus to be physically attached to a power supply device for charging, limiting its use and efficiency, as the charging signal drops significantly when the stylus is removed.
Innovation Solution
A wireless charging circuit with an inverter module and multiple coils distributed across the power supply device, allowing the stylus to receive a wireless charging signal at a resonant frequency, enabling charging without physical contact by selecting the closest coil based on the stylus's position and controlling the charging process through a processing and communication module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus is physically attached to the power supply device for wireless charging, then charging stability is improved, but device portability and ease of operation deteriorate
Solution Approach 1:
The power supply device is segmented into multiple independent coil components distributed at different positions. Each coil can independently provide charging signals, allowing the stylus to be charged from the nearest coil without physical attachment, thus maintaining charging stability while improving portability
Solution Approach 2:
The system dynamically selects which coil component to activate based on the stylus position. The processing module detects the stylus location and controls the switching module to connect the appropriate coil, enabling the charging system to adapt to different positions and maintain stable charging without fixed attachment
2Productivity
If multiple coils are distributed across the power supply device to enable positioning-based charging, then charging efficiency is improved, but device complexity increases
Solution Approach 1:
The charging system is divided into multiple independent coil modules, each responsible for a specific region. This segmentation allows efficient localized charging while keeping each module relatively simple in structure
Solution Approach 2:
Multiple coil components are pre-distributed at different positions on the power supply device before operation. The processing module pre-detects stylus position and pre-selects the appropriate coil, avoiding complex real-time switching calculations and reducing operational complexity
3Ease of operation
If the stylus is removed from the power supply device, then ease of operation is improved, but charging signal strength deteriorates
Solution Approach 1:
The charging capability is extended from a single-point contact interface to a distributed spatial field. Multiple coils create an extended electromagnetic field coverage area, allowing the stylus to receive charging signals from a distance without direct contact, thus improving mobility while maintaining signal strength
Solution Approach 2:
The processing module acts as an intermediary that detects stylus position and controls the switching module to activate the appropriate coil. This intermediary system ensures the correct coil is activated based on position, maintaining charging signal strength even when the stylus is not physically attached
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 charging of the stylus at various positions, reducing energy loss and improving charging efficiency by dynamically selecting the optimal coil for charging, allowing the stylus to operate without being physically attached to the power supply device.
Implementation Method 1
the inverter module is configured to: obtain a direct current signal, convert the direct current signal into a first alternating current signal at a target resonant frequency, and output the first alternating current signal to the first coil component
Implementation Method 2
the first coil component is configured to emit a wireless charging signal based on the first alternating current signal
Implementation Method 3
the second coil component is configured to: receive a wireless charging signal, at a target resonant frequency, emitted by a power supply device, convert the wireless charging signal into a second alternating current signal
Implementation Method 4
the rectifier module is configured to: rectify the second alternating current signal into a direct current signal, where the direct current signal is used to charge a battery pack of the stylus
Data Source
AI summary
This application provides a wireless charging circuit and a device. The wireless charging circuit includes a power supply module, an inverter module, and a first coil component; the first coil component includes at least one coil; the power supply module is connected to the inverter module, and the inverter module is connected to the first coil component; the power supply module is configured to: output a direct current signal to the inverter module; and the inverter module is configured to: convert the direct current signal into an alternating current signal at a target resonant frequency, and output the alternating current signal to the first coil component, where the target resonant frequency is at an MHz level. In this application, a stylus can obtain electric energy from a power supply device without being clung to the power supply device.