Electric Vehicle Underbody Shielding for Wireless Power Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of non-contact resonance-based power transfer for electric vehicles generates high-frequency electromagnetic waves that can adversely affect the vehicle's electric equipment.
Innovation Solution
The power receiving resonator and power cable are positioned under a metal underbody, which shields the electromagnetic waves, preventing them from affecting the vehicle's internal equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-contact resonance-based power transfer is used to charge the vehicle, then power transfer efficiency and convenience are improved, but electromagnetic waves are generated that adversely affect the vehicle's electric equipment
Solution Approach 1:
The vehicle body is segmented into an upper portion (containing electric equipment) and a lower portion (containing the power receiving resonator), separated by the metal underbody. This spatial segmentation isolates the harmful electromagnetic waves generated during resonance-based power transfer from the sensitive electric equipment, allowing efficient wireless charging while protecting against interference.
Solution Approach 2:
The metal underbody acts as an intermediary shielding structure between the power receiving resonator and the vehicle's electric equipment. It absorbs and blocks electromagnetic waves generated during resonance-based power transfer, preventing them from reaching sensitive components while allowing the power transfer system to operate efficiently.
2Ease of operation
If the power receiving resonator is positioned inside the vehicle for easy connection, then ease of operation is improved, but electromagnetic waves directly affect the electric equipment
Solution Approach 1:
The power receiving resonator is positioned in the lower dimension (under the vehicle body) rather than inside the upper dimension (vehicle cabin). This dimensional relocation places the resonator below the metal underbody, which acts as a shield, thereby protecting the electric equipment in the upper dimension from electromagnetic wave interference while maintaining operational convenience through external ground connection.
3Object-affected harmful factors
If a metal underbody is added for electromagnetic shielding, then protection against electromagnetic waves is improved, but vehicle weight increases
Solution Approach 1:
The metal underbody serves multiple functions: it provides structural support for the vehicle, protects against corrosion and road debris, and acts as an electromagnetic shield during resonance-based power transfer. By making the underbody multi-functional, additional shielding components are avoided, minimizing weight increase while achieving comprehensive protection.
Solution Approach 2:
The electromagnetic shielding effectiveness is optimized by adjusting parameters of the existing metal underbody (such as material composition, thickness, and ground connection configuration) rather than adding separate shielding structures. This parameter optimization achieves effective electromagnetic wave blocking with minimal additional weight.
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 adverse effects of electromagnetic waves on the vehicle's electric equipment during power reception, ensuring safer operation.
Implementation Method 1
resonance is a technique for causing a pair of resonators (e.g., a pair of self-resonant coils) to resonate with each other in an electromagnetic field (near field) to transfer power in a non-contact manner
Implementation Method 2
Power transfer using electromagnetic induction, power transfer using a microwave, and power transfer by resonance are known as dominant techniques for wirelessly transferring power
Implementation Method 3
Since the power receiving resonator is provided under the underbody made of metal, an electromagnetic wave generated around the power receiving resonator due to the reception of high-frequency power is shielded by the underbody
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An electrically powered vehicle (1) is capable of traveling with power supplied from a power feeding apparatus outside of the vehicle. A power receiving resonator (20) is provided under an underbody (10) made of metal, and configured to receive power from a power transferring resonator (60) of the power feeding apparatus by resonating with the power transferring resonator (60) through an electromagnetic field. A power storage device (40) stores the power received by the power receiving resonator (20). A power cable (30) is provided under the underbody (10) together with the power receiving resonator (20), and configured to transfer the power received by the power receiving resonator (20) to the power storage device (40).