Wireless Charging Magnetic Field Control for Device Displacement
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Solution Overview
Problem
Wirelessly rechargeable devices are prone to unintentional displacement while charging on surfaces with integrated wireless charging functionality, leading to potential damage due to accidental knocks or falls.
Innovation Solution
A method and device that detect unintentional displacement by analyzing movement patterns and controlling magnetic fields generated by the device and charging surface to attract the device back to the charging surface, reorienting it to minimize damage if a fall is imminent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wirelessly rechargeable device is placed on a charging surface, then the device can be recharged conveniently, but the device is prone to being accidentally knocked off the charging surface
Solution Approach 1:
The system performs preliminary detection of displacement using sensors (accelerometers, gyroscopes, proximity sensors) before the device actually falls off the charging surface. This early detection enables the system to activate magnetic fields as a preventive measure to pull the device back onto the charging surface, thus resolving the contradiction between ease of operation and reliability by maintaining device stability without complicating the charging process
Solution Approach 2:
The patent replaces mechanical attachment mechanisms with magnetic field control to prevent device displacement. Instead of using physical clips, adhesives, or mechanical locks that would complicate the system, the invention uses controllable magnetic fields generated by electromagnetic coils in the charging surface to attract and retain the device, thereby maintaining ease of operation while improving reliability
2Ease of operation
If the device is allowed to move freely on the charging surface, then the user can easily remove it, but the device may be damaged due to accidental knocks or falls
Solution Approach 1:
The system continuously monitors device position and movement using sensors (accelerometers, gyroscopes, proximity sensors) and provides feedback control. When displacement is detected, the system activates magnetic fields to pull the device back, and when the device is properly positioned, the magnetic fields are deactivated to allow easy removal. This feedback mechanism resolves the contradiction by enabling easy removal when needed while preventing damage through active monitoring and correction
Solution Approach 2:
The system applies preliminary anti-action by detecting impending displacement before it results in damage. Through continuous sensor monitoring, the system identifies when a device is being knocked or moved unintentionally and activates magnetic fields in advance to counteract the harmful movement and pull the device back onto the charging surface, thereby preventing damage while maintaining operational ease
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
Effectively inhibits unintentional movement and reduces the risk of damage to the device by magnetically attracting it to the charging surface or reorienting it to fall in a safer position, enhancing user safety and device longevity.
Implementation Method 1
a primary coil inducing electromotive force to the induction coil
Implementation Method 2
a magnetic field generated by one or both of the wirelessly rechargeable device and the charging device is controlled to inhibit the unintentional displacement
Data Source
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AI summary
A wirelessly rechargeable device (20) is positioned on an underlying charging surface (S) for charging a battery of the wirelessly rechargeable device. While the wirelessly rechargeable device is charging, it is detected whether the wirelessly rechargeable device is being displaced (A), or is likely to be displaced, relative to the charging surface. Additionally, it is detected whether the displacement, or the potential displacement, is unintentional. In response to detecting that the wirelessly rechargeable device has been displaced, or is likely to be displaced, a magnetic field between the charging surface and the wirelessly rechargeable device is controlled to inhibit the unintentional displacement of the wirelessly rechargeable device.