Movable Charging Coil and Matrix Detection for Wireless Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile-terminal charging devices lack versatility in detecting foreign objects, particularly when charging mobile terminals of different models, leading to inconvenience and failure in charging due to delicate foreign object detection mechanisms.
Innovation Solution
A mobile-terminal charging device equipped with a support plate, a movable charging coil, a controller, and multiple foreign object detection coils that store reference resonance frequencies and voltages for each location, allowing for reliable detection of foreign objects and safe operation before charging, regardless of the mobile terminal model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single foreign object detection coil is used, then the device structure is simple, but the detection reliability is insufficient for different mobile terminal models
Solution Approach 1:
The detection system is divided into multiple foreign object detection coils arranged in a matrix pattern, with each coil responsible for detecting foreign objects in its specific detection region. This segmentation allows the system to cover the entire charging area with multiple overlapping detection zones, improving detection reliability without requiring a single complex coil design.
Solution Approach 2:
The patent transitions from a single-point detection approach to a two-dimensional matrix array of detection coils. By adding the spatial dimension of multiple coils arranged in rows and columns, the system can detect foreign objects at various positions across the charging surface, significantly enhancing detection coverage and reliability.
2Adaptability or versatility
If the charging coil is fixed in position, then the device structure is simple, but the adaptability to different mobile terminal models is limited
Solution Approach 1:
The charging coil is designed to be movable rather than fixed, allowing it to adjust its position dynamically. The driver mechanism enables the charging coil to move to different locations on the support plate, adapting to various mobile terminal sizes and shapes. This dynamic positioning capability ensures optimal magnetic flux coupling regardless of the terminal model being charged.
Solution Approach 2:
The movable charging coil system provides universal compatibility with different mobile terminal models by able to position itself appropriately for each device. A single charging coil unit can serve multiple functions by moving to different locations, eliminating the need for multiple fixed coils for different device types.
3Object-affected harmful factors
If foreign object detection is not performed, then the device operation is simple, but harmful effects from undetected foreign objects occur
Solution Approach 1:
Foreign object detection is performed before the charging operation begins. The controller activates the foreign object detection coils to scan the charging area and identify any foreign objects present. Only after confirming the area is safe does the controller permit the charging coil to operate, preventing potential harmful effects before they can occur.
Solution Approach 2:
The system continuously monitors the charging area using foreign object detection coils and provides feedback to the controller. If a foreign object is detected during charging, the controller receives this feedback and immediately stops the charging operation, preventing overheating and damage. This closed-loop feedback mechanism ensures ongoing safety throughout the charging process.
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 reliable detection of foreign objects across various mobile terminal models, ensuring safe charging and improved convenience by preventing overheating and accommodating different terminal characteristics.
Implementation Method 1
the memory stores a reference resonance frequency or a reference resonance voltage of each foreign object detection coil for each location where the charging coil is present. The controller performs a safety operation before conduction of the charging coil in a case where a resonance frequency detected by one of the plurality of foreign object detection coils
Implementation Method 2
If a mobile terminal is placed on the mobile terminal placement portion, the mobile terminal can be charged by using magnetic fluxes from the charging coil
Data Source
AI summary
In a mobile-terminal charging device, a controller performs a safety operation in a case where a resonance frequency detected by a foreign object detection coil corresponding to a location where a charging coil is present is higher than a reference resonance frequency stored in a memory, or a resonance voltage detected by a foreign object detection coil corresponding to a location where the charging coil is present is lower than a reference resonance voltage stored in the memory.