Wireless Charging System Multi-Coil Overlap Shadow Area
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Solution Overview
Problem
Conventional wireless charging systems suffer from a charging shadow area due to the directional magnetic flux of closed-loop transmission coils, limiting the charging-capable area and increasing the size of shielding materials, which raises manufacturing costs and reduces charging efficiency.
Innovation Solution
A wireless charging system with a multi-reception coil configuration where reception coils are arranged to have overlapping regions with zero or minimal magnetic coupling coefficients, allowing independent power reception and maximizing the charging-capable area by spacing the closed-loop transmission coil inward from the charge bed edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed-loop transmission coil is disposed in the outermost portion of a charge bed to minimize the charging shadow area, then the charging shadow area is reduced, but the charging-capable area outside the coil cannot be used and shielding material size increases
Solution Approach 1:
The charge bed is divided into multiple charging zones by segmenting the transmission coil into multiple sections (first transmission coil section and second transmission coil section) positioned at different locations. This segmentation allows each section to serve different areas, eliminating the charging shadow problem while maximizing the usable charging-capable area without requiring excessive shielding material.
2Object-affected harmful factors
If a closed-loop transmission coil is disposed in the outermost portion of a charge bed, then the charging shadow area is minimized, but the length of the transmission coil increases
Solution Approach 1:
The transmission coil is segmented into multiple shorter sections positioned strategically within the charge bed rather than using one long coil at the edge. This reduces the length of each individual transmission coil while maintaining effective charging coverage and minimizing charging shadow areas.
3Object-affected harmful factors
If shielding material size is increased to correspond to the closed-loop transmission coil area, then electromagnetic interference is reduced, but manufacturing costs increase
Solution Approach 1:
By segmenting the transmission coil into multiple smaller sections distributed across the charge bed, the total area requiring shielding material is reduced. This allows for smaller, more cost-effective shielding implementations while still providing adequate electromagnetic interference protection for each localized charging zone.
4Productivity
If the charging shadow area is eliminated by repositioning the transmission coil, then charging efficiency is improved, but the charging-capable area utilization decreases
Solution Approach 1:
The charge bed is segmented into multiple charging zones with transmission coil sections positioned to eliminate shadow areas in each zone. This segmentation strategy simultaneously improves charging efficiency within each zone while maximizing overall area utilization across the entire charge bed surface.
Solution Approach 2:
Instead of positioning the transmission coil in a single location (one-dimensional approach), the solution distributes multiple coil sections across two-dimensional space within the charge bed. This spatial distribution eliminates shadow areas and maximizes charging-capable area utilization simultaneously.
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 configuration effectively eliminates the charging shadow area, reduces manufacturing costs by minimizing shielding material and transmission coil usage, and enhances charging efficiency by allowing wireless charging even with misalignment of the receiver.
Implementation Method 1
Wireless power transmission (wireless energy transfer) technology is a technology for wirelessly transmitting electrical energy from a transmitter to a receiver using an electromagnetic induction principle
Implementation Method 2
reception coils are arranged to have overlapping regions with zero or minimal magnetic coupling coefficients
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The present invention relates to a wireless charging system using a wireless charging system, and a device therefor. A wireless power receiving device according to one embodiment of the present invention may comprise: first to Nth receiving coils disposed to be partially overlapped on the same plane so as to receive wireless power signals; first to Nth output terminals formed to enable both ends of each of the first to Nth receiving coils to be connected thereto so as to transfer alternating current power induced by at least any one among the first to Nth receiving coils; and a rectifier for converting, into direct current power, the alternating current power to be input from the first to Nth output terminals. Therefore, the present invention has an advantage of minimizing charging interruptions and minimizing manufacturing costs of a wireless power transmitting device.