Planar Coil Matrix for Contactless Energy Transmission
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Solution Overview
Problem
Contactless energy transmission systems with planar transmission coils face challenges in maintaining efficient energy transfer independently of receiver position and minimizing electromagnetic stray fields, which can lead to reduced system functionality and safety concerns due to unwanted electromagnetic interference.
Innovation Solution
A matrix arrangement of coils with minimized mutual coupling, where coils are designed to have a central axis perpendicular to the surface and arranged in a regular pattern with optimized geometry to reduce coupling between adjacent coils, allowing for simultaneous operation of individual coils without interference and efficient energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple transmitting coils are arranged in a planar unit for contactless energy transmission, then energy transmission capability is improved, but electromagnetic stray fields increase causing interference and safety concerns
Solution Approach 1:
The planar transmitting unit is divided into multiple spatially adjacent coils that are magnetically decoupled from each other. Each coil operates independently with minimal mutual coupling, allowing the system to maintain high power transmission capability while reducing electromagnetic interference between coils. The segmentation enables selective activation of individual coils based on receiver position.
Solution Approach 2:
Each coil in the array is designed with specific geometric characteristics and positioning to optimize local magnetic field distribution. The coils have different orientations and dimensions tailored to their specific locations within the planar unit, enabling homogeneous coupling across the entire surface while minimizing stray fields in any given local region.
2Power
If coils are arranged closely in a planar unit to increase transmission power, then power transmission is improved, but coupling between adjacent coils increases causing interference
Solution Approach 1:
Adjacent coils are designed with asymmetric geometric relationships, including different orientations, sizes, and spacing patterns. This asymmetry disrupts magnetic coupling symmetry, significantly reducing mutual inductance between adjacent coils. The asymmetric arrangement allows closely spaced coils to operate independently without significant interference.
Solution Approach 2:
The coils are arranged in a three-dimensional spatial configuration within the planar unit, utilizing vertical positioning and angular orientations in addition to horizontal spacing. This multi-dimensional arrangement reduces magnetic coupling by orienting coil planes at different angles, thereby minimizing the overlap of magnetic field lines between adjacent coils.
3Power
If the distance between transmitting coils is reduced to increase power density, then power transmission efficiency is improved, but position-independent coupling deteriorates
Solution Approach 1:
The system incorporates dynamic control capabilities where individual coils can be selectively activated or deactivated based on the real-time position of the receiving coil. This dynamic switching maintains optimal coupling conditions regardless of receiver position, ensuring position-independent energy transmission efficiency while allowing reduced spacing between coils.
Solution Approach 2:
Each coil in the array is designed to be functionally equivalent and interchangeable, with identical electrical characteristics and similar geometric properties. This universality allows any coil to effectively couple with a receiver positioned anywhere in the planar unit's coverage area, maintaining position-independent performance while enabling high power density through reduced coil spacing.
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 ensures position-independent energy transmission efficiency and minimizes electromagnetic stray fields, enabling efficient and safe energy transfer to multiple receivers while avoiding coil interference, thus enhancing system functionality and safety.
Implementation Method 1
Contactless energy transmission systems based on induction are well known. Basically, this involves using a time-varying current flow through one or more transmitting or primary coils based on the induction principle to generate voltage in one or more relatively close-positioned receiving or secondary coils
Implementation Method 2
The time-varying voltage induced in this way in the receiving coil can then, for example, be rectified and used to supply an electronic circuit with power and/or to charge a battery
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
The invention relates to an arrangement and a method for contactless energy transmission by means of induction. There is a plurality of coils arranged in a matrix, wherein the coils have at least one conductor, which, at least once, surrounds a central axis of the associated coil in one turn. The central axis is perpendicular to the area surrounded by the conductor at the geometric centre of the surrounded area. The coils are arranged next to one another in a planar unit which extends in a first dimension, a second dimension and a third dimension. The extent of the planar unit in the first dimension and in the second dimension is substantially greater than in the third dimension. The central axis of each coil is, at least locally, at least virtually perpendicular to the area spanned by the first dimension and the second dimension. In addition, the coils are arranged within the planar unit regularly in rows and/or columns in such a way that each coil has at least two or three directly adjacent coils. The distances between the geometric centres of area of the coils with respect to one another and the shape and the spread of the at least one turn per coil are selected such that the mutual electromagnetic coupling between the associated coils is minimal for all pairs of directly adjacent coils in the planar unit.