Wireless Charging Pad Coil Array Positioning
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Solution Overview
Problem
Conventional wireless charging systems using electromagnetic induction suffer from reduced charging efficiency and potential interference with wireless communication performance due to the magnetic field generated by the charging coil, which can also affect the stability and lifespan of mobile terminals.
Innovation Solution
A wireless charging system that includes a charging pad with a first coil capable of detecting the location of a mobile terminal and moving to correspond with it, minimizing the magnetic field's impact on communication performance and optimizing charging efficiency regardless of the terminal's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wireless charging system uses a first coil to generate a magnetic field for charging, then charging efficiency is improved, but wireless communication performance deteriorates due to magnetic field interference
Solution Approach 1:
The charging pad is divided into multiple independently controllable coil units arranged in an array. Instead of using a single large coil, the system segments the magnetic field generation into multiple smaller units that can be selectively activated based on the mobile terminal's position, reducing overall magnetic field interference while maintaining charging efficiency.
Solution Approach 2:
The system activates only the specific coil unit(s) located at or near the mobile terminal's position, rather than activating all coils uniformly. This localized activation concentrates the magnetic field where needed for charging while minimizing the overall magnetic field footprint, thereby reducing interference with wireless communication.
2Productivity
If a large first coil is used to cover the entire charging pad area, then charging efficiency is improved, but the magnetic field affects a high and wide area causing deterioration of mobile terminal performance and lifetime
Solution Approach 1:
The charging pad is divided into multiple independently controllable coil units arranged in an array. Instead of using a single large coil, the system segments the magnetic field generation into multiple smaller units that can be selectively activated based on the mobile terminal's position, reducing overall magnetic field interference while maintaining charging efficiency.
Solution Approach 2:
The system dynamically selects and activates only the coil unit(s) corresponding to the mobile terminal's current position, rather than continuously activating all coils. This dynamic localization reduces the spatial extent of the magnetic field at any given time, minimizing harmful effects on the mobile terminal while maintaining charging efficiency.
3Productivity
If multiple first coils are mounted to cover the charging pad area, then charging efficiency is improved, but device complexity increases
Solution Approach 1:
Each coil unit in the array is designed to be identical and independently controllable, allowing any coil to serve any position. This universality simplifies the control logic - the system only needs to determine which position requires charging and activate the corresponding coil, rather than managing complex individual control for each coil with unique characteristics.
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 approach ensures stable and efficient charging of mobile terminals without degrading wireless communication performance, allowing for optimal charging efficiency across various locations and reducing the risk of magnetic interference.
Implementation Method 1
A method for wirelessly charging a mobile terminal using electromagnetic induction between a first coil included in a charging pad and a second coil included in the mobile terminal
Implementation Method 2
charges a battery using an induced current generating in a coil (hereinafter, a second coil) included in a mobile terminal, or a battery using a magnetic field generating in the first coil
Data Source
AI summary
A wireless charging system can optimize charging efficiency regardless of a location of a mobile terminal. The wireless charging system wirelessly charges a mobile terminal using electromagnetic induction between a first coil included in a charging pad and a second coil included in the mobile terminal. The charging pad can detect a location of the mobile terminal on the charging pad. The charging pad can move the first coil to correspond to the detected location of the mobile terminal; and supply power to the first coil and charging a battery.