Wireless Charging Circuit With Multi-Coil Stylus Position Selection
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Solution Overview
Problem
Styluses with wireless charging functionality require direct contact with a power supply device for charging, leading to limitations in usage and aesthetics, and existing wireless charging systems lack efficiency and flexibility in charging positions.
Innovation Solution
A wireless charging circuit with multiple coils distributed across a power supply device, controlled by a processing module to select the optimal coil for charging based on the stylus's position, allowing charging without direct contact and improving efficiency by minimizing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stylus is clung to a charging side of a power supply device for wireless charging, then charging function is achieved, but usage flexibility and aesthetics are compromised
Solution Approach 1:
The power supply device is segmented into multiple independent coil components distributed at different positions (first coil component, second coil component, etc.). Each coil can independently provide charging function, allowing the stylus to be charged at multiple positions rather than requiring a single fixed charging location, thus improving usage flexibility while maintaining charging reliability.
Solution Approach 2:
The power supply device is designed with multiple coils that can serve different functions: some coils are optimized for charging styluses at various positions on the display surface, while others can provide charging at the edge or bottom of the device. This multi-functional design allows a single device to support multiple charging scenarios, resolving the contradiction between flexibility and reliability.
2Adaptability or versatility
If multiple coil components are distributed at different positions, then charging flexibility is improved, but device complexity increases
Solution Approach 1:
Multiple coil components are merged into a unified wireless charging system controlled by a single processor. The processor integrates control of all coil components, managing their activation and deactivation based on stylus position detection. This merging approach allows multiple coils to work together as a coordinated system rather than independent units, reducing overall system complexity while maintaining charging flexibility.
Solution Approach 2:
The system dynamically selects and activates specific coil components based on real-time stylus position detection. Rather than all coils operating simultaneously or being permanently active, the processor dynamically enables only the necessary coils for current charging needs, optimizing system resource usage and reducing effective complexity while maintaining adaptability across different charging positions.
3Ease of operation
If the stylus is removed from the charging position, then usage freedom is improved, but charging function is lost
Solution Approach 1:
The charging capability is extended from a single point contact dimension to a two-dimensional surface coverage. Multiple coils are distributed across the display surface and edge areas, creating overlapping magnetic fields that cover a larger spatial volume. This allows the stylus to maintain charging connection through a range of positions rather than requiring precise point-to-point alignment, enabling usage freedom while preserving charging reliability.
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 of styluses at various positions, enhancing user experience by allowing charging during use and reducing energy loss, thus improving charging efficiency and flexibility.
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 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
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2~3
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.