Wireless Power Transmission Coil Layout for Uniform Multi-Receiver Charging
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Solution Overview
Problem
Existing wireless power transfer (WPT) systems face issues with unequal performance among multiple receivers due to varying placements relative to the transmitter, leading to inefficiencies and non-uniform power distribution.
Innovation Solution
The use of a transmission coil with a shape similar to the reception coils, narrow connections between adjacent conductors, and parallel-stacked transmission coils to ensure uniform power distribution and reduce leakage magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single transmitter transmits wireless power to multiple receivers using conventional coil configurations, then multiple receivers can be charged simultaneously, but the receivers exhibit unequal performance due to different placement positions
Solution Approach 1:
The transmission coil is segmented into multiple identical coil units arranged in a matrix pattern, where each unit independently contributes to power transfer. This segmentation allows the system to maintain uniform magnetic field distribution across multiple receivers, ensuring equal performance regardless of receiver placement position.
Solution Approach 2:
Multiple identical coil units are nested in a structured matrix arrangement, with each unit containing the same conductor configuration and dimensions. This nested structure ensures that each receiver receives equivalent magnetic coupling, resolving the performance inequality issue while maintaining simultaneous charging capability.
2Ease of manufacture
If transmission coils are designed with wide connections between adjacent conductors for ease of manufacture, then manufacturing is simplified, but leakage magnetic fields increase and affect surrounding circuit elements
Solution Approach 1:
The connection portions between adjacent conductors are designed with locally optimized narrow widths specifically at critical coupling points, while other portions maintain adequate spacing for manufacturing. This local quality adjustment minimizes leakage magnetic fields in sensitive areas without compromising overall manufacturability.
Solution Approach 2:
The conductor connection width parameter is precisely controlled to be narrower than the conductor width itself, creating a specific geometric parameter relationship that reduces magnetic field leakage. This parameter optimization achieves the dual goal of maintaining ease of manufacture while minimizing harmful electromagnetic effects.
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 achieves uniform performance across receivers, enhances power transmission efficiency, and minimizes the impact of leakage magnetic fields on surrounding circuit elements.
Implementation Method 1
The principle of WPT is that a magnetic field is generated in a first coil of a transmitting end, and current induced or resonated in a second coil of a receiving end according to a change in the generated magnetic field generates energy at the receiving end.
Implementation Method 2
the resonance scheme has the advantage that wireless power transmission is possible even if the first and second coils are relatively far apart or not accurately aligned
Data Source
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AI summary
According to various embodiments, an electronic apparatus comprises: a plurality of reception coils; a first transmission coil magnetically coupled to the plurality of reception coils and including a plurality of first conductors connected to each other; and a power generation circuit configured to convert an input direct current into an alternating current and provide the alternating current to the first transmission coil, wherein first inner regions defined by the plurality of first conductors, when viewed in one direction, may at least partially overlap second inner regions defined by the plurality of reception coils arranged at corresponding positions, respectively, and a distance between connection portions of the first transmission coil, which connect adjacent first conductors among the plurality of first conductors, may be narrower than the width of each of the adjacent first conductors when viewed in one direction.