Eccentric Sub-Coil Structure for Uniform Magnetic Field Generation
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Solution Overview
Problem
Conventional wireless charging systems face inefficiencies due to non-uniformity in the magnetic field generated by coils, affecting charging power transfer and efficiency across different electronic devices.
Innovation Solution
A coil structure featuring a sub-coil with an eccentric-coil portion and parallel, inclined wire sections, along with a coil apparatus comprising multiple sub-coils and an auxiliary coil, is designed to generate a uniform magnetic field by electrically connecting these components to a control circuit, ensuring consistent power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coil structure is used to generate magnetic field, then the coil structure is simple, but the magnetic field uniformity is poor affecting wireless charging efficiency
Solution Approach 1:
The coil structure is divided into multiple independent sub-coils (first sub-coil, second sub-coil, third sub-coil, fourth sub-coil) arranged in a specific pattern. Each sub-coil is further segmented into multiple wire sections (e.g., first wire section, second wire section) that are electrically isolated from each other. This segmentation allows independent control and optimization of magnetic field generation in different regions, achieving uniform magnetic field distribution across the entire charging area.
Solution Approach 2:
Different wire sections within each sub-coil have different electrical connection configurations. Specifically, alternate wire sections are connected to form continuous paths while others remain isolated, creating local variations in current distribution. This local quality differentiation enables precise control over the magnetic field strength and uniformity in different spatial zones, resolving the contradiction between field uniformity and structural simplicity.
2Productivity
If wire sections are connected in parallel to simplify structure, then the structure is easier to manufacture, but current distribution becomes uneven reducing charging efficiency
Solution Approach 1:
The coil assembly is segmented into multiple independent sub-coils, each containing multiple wire sections. Rather than connecting all wire sections in a single parallel or series configuration, each sub-coil's wire sections are independently configured with selective electrical connections. This segmentation allows for optimized current distribution paths in each sub-coil while maintaining manufacturing modularity.
Solution Approach 2:
The electrical connection configuration of wire sections is dynamically optimized for different operating conditions. The design allows selective connection of alternate wire sections to create balanced current distribution patterns, ensuring uniform power delivery across different device types and positions. This dynamic configurability maintains high charging efficiency while simplifying the manufacturing process through standardized sub-coil modules.
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
The solution enhances wireless charging efficiency by maintaining a uniform magnetic field, allowing for effective charging of various electronic devices with improved power transfer, regardless of device type or power requirements.
Implementation Method 1
When the control circuit supplies a current to the sub-coil, the sub-coil generates a uniform magnetic field for wireless charging applications
Implementation Method 2
When the sub-coils of the coil units are connected in series to the auxiliary coil and a current flows through the sub-coils and the auxiliary coil, the sub-coils can independently generate a uniform magnetic field
Data Source
AI summary
A coil structure for generating a uniform magnetic field and a coil apparatus having the same are disclosed. The coil apparatus has a plurality of coil units, and each of the coil units includes a sub-coil and a plurality of wire sections. The sub-coil has an eccentric-coil portion and two circuit connecting portions. The two circuit connecting portions are respectively connected to two segments of the eccentric-coil portion. The wire sections are arranged in parallel at intervals, are opposite the sub-coil, overlap the sub-coil, and are relatively inclined to the sub-coil. The circuit connecting portions of the segments of the coil units are connected to each other to form an auxiliary coil. A center position of the sub-coils is corresponding to a center position of the auxiliary coil so that a current flows through the sub-coils and the auxiliary coil to generate a uniform magnetic field.