Adjustable Shielding Panels for EV Wireless Charging Coils
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Solution Overview
Problem
Existing wireless power transmission systems for electric vehicles face challenges in effectively shielding electromagnetic waves, particularly for all harmonic components, and exposing electronic devices and human bodies to potential malfunctions and heat generation due to electromagnetic interference.
Innovation Solution
A wireless power transmission device with adjustable shielding panels around the transmitting coil, controlled by a rotary shaft and a controlling unit, which adjusts the panels' angles based on vehicle proximity to minimize electromagnetic interference and enhance shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate shielding coil or loop-shaped electromagnetic wave shielding device is used, then electromagnetic wave shielding is provided in a specific direction or frequency, but it is difficult to substantially reduce electromagnetic waves for all directions and harmonic components
Solution Approach 1:
The shielding structure is divided into multiple segments: a first shielding coil wound around the transmitting coil for primary shielding, and a second shielding coil positioned at a distance to form a Faraday cage structure. This segmented approach provides comprehensive electromagnetic wave shielding in multiple directions and frequency ranges, overcoming the limitation of single-direction shielding in prior art
Solution Approach 2:
The first shielding coil is nested around the transmitting coil, while the second shielding coil is positioned to enclose the first shielding coil, forming a nested dual-coil structure. This nested configuration creates multiple shielding layers that work together to reduce electromagnetic waves across all directions and harmonic components
2Productivity
If the transmitting coil and reception pad are exposed to air for power transfer, then wireless charging is enabled, but electromagnetic waves affect electronic devices and human bodies causing malfunctions and heat generation
Solution Approach 1:
The first and second shielding coils act as intermediary elements between the transmitting coil and the surrounding environment. These shielding coils reduce electromagnetic wave radiation while allowing the wireless charging function to operate normally, thus mediating between productivity and harmful factor reduction
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 solution provides comprehensive electromagnetic wave shielding, reducing interference and enhancing transmission efficiency by adjusting panel angles to cover all sides of the coil, thus minimizing electromagnetic exposure and improving charging efficiency.
Implementation Method 1
a transmitting coil configured to generate a magnetic field for wireless charging
Implementation Method 2
at least one shielding panel positioned around the transmitting coil
Data Source
AI summary
The present disclosure relates to a method of electric vehicle wireless power transmission and a device therefor with an electromagnetic wave shielding function. According to an aspect of the present disclosure, provided is a wireless power transmission device for wirelessly charging an electric vehicle, including: a transmitting coil configured to generate a magnetic field for wireless charging; at least one shielding panel positioned around the transmitting coil; at least one rotary shaft each attached to an edge of the at least one shielding panel and formed to be able to each adjust a standing angle of the at least one shielding panel by rotation; and a controlling unit configured to drive the at least one rotary shaft to adjust the standing angle of the at least one shielding panel if wireless charging of an electric vehicle is started.