Vehicle Wireless Charging Coil Orientation for EMI Reduction
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Solution Overview
Problem
In-vehicle devices in electric vehicles are significantly affected by the electromagnetic fields formed around coils during wireless charging, which can interfere with their operation and performance.
Innovation Solution
The vehicle design incorporates a coil configuration where the winding axis is shorter than the vehicle's front-rear length, disposed within the bottom surface, and arranged to minimize the impact of electromagnetic fields, with a power reception unit that includes multiple coils and a ferrite core to optimize power transfer efficiency and reduce electromagnetic field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coil is mounted in the vehicle for wireless charging, then power transfer efficiency is improved, but in-vehicle devices are significantly affected by electromagnetic fields
Solution Approach 1:
The patent changes the orientation of the coil's winding axis from the conventional vertical direction to the width direction of the vehicle. This dimensional change in coil orientation redistributes the electromagnetic field distribution, directing the field primarily in the width direction rather than vertically, thereby reducing interference with in-vehicle devices while maintaining power transfer efficiency
Solution Approach 2:
The patent applies local quality by positioning the coil specifically in the width direction and using a ferrite core with specific magnetic properties to concentrate and control the electromagnetic field in targeted areas, reducing field spread to sensitive in-vehicle devices while maintaining efficient power transfer at the charging interface
2Object-affected harmful factors
If the coil is disposed with winding axis in the width direction, then electromagnetic field distribution is minimized, but power transfer efficiency may be reduced
Solution Approach 1:
The patent employs a ferrite core as a composite magnetic material with high permeability and low loss characteristics. This composite material concentrates and guides the magnetic flux along the width direction, enabling the coil to maintain efficient power transfer while the electromagnetic field is distributed in a controlled manner that minimizes interference with in-vehicle devices
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 effectively suppresses the impact of electromagnetic fields on in-vehicle devices, enhancing their operation and reducing electromagnetic interference, while improving power transfer efficiency and minimizing field strength below the vehicle's surface.
Implementation Method 1
a coil receiving electric power contactlessly from a power transmission unit provided externally
Implementation Method 2
The power reception unit includes a ferrite plate and a coil wound around this ferrite plate
Data Source
AI summary
A vehicle includes a coil (22) receiving electric power contactlessly from a power transmission unit (56) provided externally; and a bottom surface. The coil (22) is formed to surround a winding axis (O1) of the coil (22). When the winding axis (O1) and the bottom surface (76) are viewed from above the vehicle, the coil (22) is disposed such that the winding axis (O1) located to fall within the bottom surface (76) is shorter in length than the vehicle in a front-rear direction.