Magnetic Coupler Interlaced Coils Wireless EV Charging
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Solution Overview
Problem
Wireless charging of electric vehicles faces challenges of low coupling efficiency, high electromagnetic radiation leak, and limited charging distances due to the high energy requirements and size limitations of onboard wireless battery chargers.
Innovation Solution
A magnetic coupler design featuring interlaced coils on a transmitter plate made of magnetic material, with adjustable sizes and positions to optimize the electromagnetic field for high efficiency and reduced radiation, allowing for adaptive control of the energy transfer between the transmitter and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If typical winding configurations (concentric, double D, double-D quadrature) are used, then the magnetic coupler can transfer energy wirelessly, but coupling efficiency is low and electromagnetic radiation leak is high
Solution Approach 1:
The patent divides the single coil into multiple separate coils (first coil and second coil) that are disposed at different positions. Each coil is independently controlled to generate magnetic fields that overlap in the target region, improving coupling efficiency while reducing electromagnetic radiation in non-target areas.
Solution Approach 2:
The patent creates different magnetic field characteristics in different spatial regions. By positioning coils at specific locations and controlling their individual fields, the magnetic fields concentrate and overlap where needed (between transmitter and receiver) while minimizing radiation in other directions.
2Ease of operation
If wireless charging is implemented for electric vehicles, then charging convenience is improved, but charging distance is limited
Solution Approach 1:
The patent extends the magnetic field interaction from a single-plane configuration to a multi-dimensional spatial arrangement by positioning multiple coils at different locations and orientations. This creates a more volumetric magnetic field distribution that maintains coupling efficiency over extended distances.
3Adaptability or versatility
If onboard wireless battery chargers are installed in vehicles, then wireless charging capability is achieved, but device size is constrained
Solution Approach 1:
The patent divides the charging system into multiple smaller coil units rather than requiring one large coil. This segmentation allows the system to achieve the required magnetic field coverage and coupling efficiency while fitting within the constrained space of onboard vehicle installation.
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
The design achieves high charging efficiency and low electromagnetic emission by optimizing the shape and distribution of the electromagnetic field, enabling efficient energy transfer over longer distances while minimizing the overall size of the charging system.
Implementation Method 1
The transmitter and receiver can include coils for transmitting energy through a resonating electromagnetic (EM) field
Implementation Method 2
A magnetic coupler includes a transmitter and a receiver. The transmitter and receiver can include coils for transmitting energy through a resonating electromagnetic (EM) field
Implementation Method 3
The transmitter and receiver can include coils for transmitting energy through a resonating electromagnetic (EM) field
Data Source
AI summary
A transmitter for a magnetic coupler includes a plate made of a magnetic material. A first coil and a second coil are arranged on a surface of the plate. The first coil and the second coil are disposed within a periphery of the surface of the plate. A first portion of the first coil overlaps a first portion of the second coil. The transmitter emits a magnetic field.