Asymmetric Wireless Power Coil Design for Constant Coupling
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Solution Overview
Problem
Existing wireless power charging systems face inefficiencies due to varying coupling coefficients between the transmission and reception apparatuses, leading to increased costs and reduced efficiency, especially when the location of the wireless power reception apparatus changes.
Innovation Solution
A wireless power transmission apparatus with bilaterally symmetrical upper and lower transmission coils, connected through first and second terminals, maintains a constant coupling coefficient regardless of the reception apparatus's location, ensuring consistent power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless power charging system uses a resonance scheme, then wireless power transmission is achieved, but the coupling coefficient varies with the location of the wireless power reception apparatus
Solution Approach 1:
The transmission coil is divided into multiple segments (first transmission coil and second transmission coil) that are spatially separated and independently positioned. Each segment contributes to the overall magnetic field in a controlled manner, allowing the system to maintain consistent coupling characteristics across different reception locations.
Solution Approach 2:
The first and second transmission coils are positioned asymmetrically relative to the charging surface, with different orientations and locations. This asymmetric arrangement creates a balanced magnetic field distribution that compensates for position variations of the reception apparatus, maintaining constant coupling coefficient.
2Adaptability or versatility
If the coupling coefficient varies with location, then the wireless power transmission can adapt to different positions, but the variation range of transmission power amount must be increased
Solution Approach 1:
By segmenting the transmission coil into multiple independent coils positioned at different locations, the system achieves location flexibility without requiring large power adjustments. Each segment maintains a consistent contribution to the total magnetic field regardless of reception apparatus position.
Solution Approach 2:
Different segments of the transmission coil are positioned to provide optimized local magnetic field coverage for different areas of the charging surface. This ensures that regardless of where the reception apparatus is placed, it always receives adequate magnetic field strength with minimal power variation.
3Reliability
If the coupling coefficient is kept constant, then power transmission efficiency is improved, but the chargeable area must be limited
Solution Approach 1:
The transmission system is divided into multiple coil segments that collectively cover a larger spatial area. Each segment maintains constant coupling characteristics for its local region, and the combination of segments extends the constant-coupling property across the entire chargeable area.
Solution Approach 2:
The transmission coils are arranged in three-dimensional space with different orientations and positions, not just in a single plane. This spatial distribution allows the magnetic field to maintain consistent coupling characteristics across a larger area by utilizing vertical and lateral positioning.
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 design enhances power transmission efficiency by maintaining a constant coupling coefficient, reducing the variation in power transmission and lowering system costs while enlarging the chargeable area.
Implementation Method 1
an upper transmission coil on the mounting member, a lower transmission coil under the mounting member
Data Source
AI summary
A wireless power transmission apparatus can include a coil unit including a first layer including a first wireless power transmission coil having an asymmetric shape, and a second layer including a second wireless power transmission coil having an asymmetric shape, the first and second wireless power transmission coils being connected in parallel and partially overlapping with each other; and first and second terminals configured to simultaneously apply current to the first and second wireless power transmission coils connected in parallel, in which the first wireless power transmission coil and the second wireless power transmission coil have line symmetry with respect to an imaginary line extending between the first and second terminals and between the first and second layers.