Split Circular Coil Wireless Charging System
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Solution Overview
Problem
Existing inductive wireless charging systems for electric vehicles face sub-optimal coupling issues between circular and solenoid designs, leading to higher magnetic flux densities that cause overheating and installation challenges.
Innovation Solution
A floor-mounted charging station with two circular coils of equal size, arranged in the same plane with opposite current directions, and an iron core element, allowing for reduced magnetic flux density and efficient energy transfer while avoiding overheating, and enabling a compact, flat design for easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a solenoid design is used for wireless charging, then the coupling is improved and the size is reduced, but the magnetic flux density increases causing overheating of metallic bodies
Solution Approach 1:
The patent divides the single circular winding into two separate circular windings (first and second circular windings) with opposite current directions. This segmentation allows the magnetic flux densities to partially cancel each other out, reducing the overall heating effect on metallic foreign bodies while maintaining the compact solenoid vehicle-side coil design
Solution Approach 2:
The two circular windings are configured with opposite current directions so that their magnetic field effects counterbalance each other. This creates a counterweight effect where the harmful magnetic flux density and heating effect of one winding is compensated by the opposing winding, enabling safe operation with reduced volume
2Object-affected harmful factors
If a circular design is used for wireless charging, then the magnetic flux density is reduced, but the coupling becomes sub-optimal and the surface area increases
Solution Approach 1:
The patent segments the circular winding design into two separate circular windings with opposite current directions. This segmentation allows the system to maintain the low flux density advantage of circular designs while improving coupling efficiency through the specific configuration, and reduces the required surface area compared to a single large circular winding
3Object-affected harmful factors
If a circular design is used for wireless charging, then the magnetic flux density is reduced, but the mounting capability on vehicles is reduced
Solution Approach 1:
By segmenting the circular winding into two separate windings configured with opposite current directions, the patent creates a system that maintains low flux density while achieving better coupling. This improved coupling makes the system more suitable for vehicle mounting applications, as the vehicle-side solenoid coil can achieve optimal alignment and coupling with the split circular windings
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 enhances magnetic field distribution, allowing a smaller solenoid winding to operate safely and efficiently, minimizing overheating risks and simplifying installation, while maintaining optimal energy transfer for electric vehicle charging.
Implementation Method 1
an arrangement for the inductive wireless delivery of energy
Implementation Method 2
an iron core element can be sized to extend from a central region of the first coil to a central region of the second coil
Data Source
AI summary
An arrangement for the inductive wireless transmission of energy to a receiver coil of an electrically operated vehicle includes a controllable power supply, an electrically conductive first coil of circular shape, and an electrically conductive second coil of circular shape. The first and second coils are connected to the controllable power supply such that a current direction in the second coil is directed opposite to a current direction in the first coil.