Wireless Charging Region Determination via Magnetic Field Zero-Crossing
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Solution Overview
Problem
Current wireless charging systems face inefficiencies in determining the optimal charging region due to inaccuracies in magnetic field detection, leading to suboptimal alignment and reduced charging efficiency.
Innovation Solution
The system employs a cylindrical magnet with a compass sensor to detect magnetic field intensities in axial and perpendicular directions, determining a circular charging region by identifying points where the magnetic field intensity is zero, with the processor correcting for non-orthogonal errors and external influences to improve alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional magnetic field detection methods are used to determine charging region, then the system structure is simple, but the measurement precision of magnetic field detection is insufficient leading to suboptimal alignment
Solution Approach 1:
The patent divides the magnetic field detection into multiple orthogonal components (Bx, By, Bz) measured by separate sensor axes. The compass sensor detects magnetic field intensities in different directions (first direction axial to cylindrical magnet, second direction perpendicular), and the processor segments the detection data to identify zero-crossing points independently in each direction, thereby improving measurement precision without requiring a single complex sensor
Solution Approach 2:
The patent introduces a compass sensor as an intermediary device between the cylindrical magnet and the charging alignment system. This intermediary sensor, combined with processor-based analysis of magnetic field zero-crossing points, provides precise determination of the charging region center and orientation, resolving the contradiction between simple structure and high precision measurement
2Measurement precision
If magnetic field detection is performed without correcting for non-orthogonal errors and external influences, then the detection process is simple, but the alignment accuracy is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the compass sensor continuously detects magnetic field intensities in multiple directions, the processor analyzes these detections to identify zero-crossing points, determines the charging region center and orientation, and uses this information to guide accurate alignment. This closed-loop feedback process compensates for non-orthogonal errors and external magnetic influences, improving alignment accuracy while maintaining reasonable process complexity
Solution Approach 2:
The patent performs preliminary detection of magnetic field intensities in multiple orthogonal directions before final alignment determination. By pre-detecting and analyzing magnetic field data to identify zero-crossing points and determine the charging region, the system prepares accurate alignment information in advance, reducing the impact of errors during the actual charging setup
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 enhances the precision of determining the charging region, improving the efficiency of the wireless charging process by ensuring accurate alignment between the electronic device and the wireless charging base.
Implementation Method 1
a compass sensor configured to detect magnetic field intensities of a magnetic field generated by the cylindrical magnet in a first direction and a second direction
Data Source
AI summary
The disclosure relates to a wireless charging system, a determining method and device for a charging region, and an electronic device. The wireless charging system can include a wireless charging base and an electronic device. The wireless charging base includes a cylindrical magnet disposed axially along a thickness of the wireless charging base. The electronic device includes a charging coil component, a compass sensor which is configured to detect magnetic field intensities of a magnetic field generated by the cylindrical magnet in a first direction and in a second direction. The first direction is an axial direction of the cylindrical magnet and is perpendicular to the second direction. The electronic device further includes a processor configured to determine, according to the magnetic field intensities in the first direction and in the second direction, a charging region formed by the cylindrical magnet and adapted to the charging coil component.