Wireless Charging Pad Magnetic Force Control
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Solution Overview
Problem
Existing wireless charging technologies do not allow for easy movement of devices across a charging pad while charging, as they maintain a magnetic force that can hinder device positioning and usability.
Innovation Solution
A system that detects the physical presence of a user and adjusts the magnetic force between the charging pad and device, discontinuing it when the user is present to facilitate movement, while ensuring continuous charging through conductive contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a magnetic force is maintained between the charging pad and device during charging, then the device remains stable on the charging pad, but the device cannot be easily moved across the charging pad surface
Solution Approach 1:
The patent applies the dynamics principle by making the magnetic force adjustable rather than static. The magnetic force is dynamically controlled based on detected conditions - when a user approaches or the device is removed from the charging pad, the magnetic force is reduced or discontinued to enable easy movement. When the device is properly positioned for charging, the magnetic force is activated to maintain stability. This dynamic adjustment resolves the contradiction between stability and ease of movement.
2Ease of operation
If the magnetic force is discontinued when a user is present, then the device can be easily moved for use, but the charging connection may be interrupted
Solution Approach 1:
The patent implements feedback by using sensors to detect whether a user is present or approaching the device. Based on this feedback, the system automatically adjusts the magnetic force - reducing it when a user is detected to enable easy device pickup and movement. The feedback mechanism ensures that the magnetic force is only reduced when appropriate (when user presence is detected), preventing unintended disconnections during normal charging operations while enabling easy movement when needed.
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 easy movement of wireless devices across a charging pad without interrupting charging, improving usability and convenience by allowing devices to be used without being removed from the charging pad.
Implementation Method 1
a magnetic force is provided between a charging pad and the device
Implementation Method 2
an electromagnet is a type of magnet in which a magnetic field is produced in response to electric current flow
Implementation Method 3
Power is then conductively transferred from the pad to the device via two of the parallel conductors and two of the electrical contacts
Data Source
AI summary
A technique for charging a wireless device includes detecting a physical presence of a user with respect to the device. A magnetic force is provided between a charging pad and the device only when the physical presence of the user, with respect to the device, is not detected. In this case, a rechargeable power source of the device receives a charging current from the charging pad via conductive contacts of the device.