Wireless Power Coil Orientation and Shielding for EV
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Solution Overview
Problem
Wireless power transmission to moving electric vehicles faces challenges in managing leakage magnetic fields due to changing relative positions of power receiving and transmitting coils, leading to unwanted electromagnetic disturbances.
Innovation Solution
A wireless power supply system with a power transmitting coil oriented parallel to the travel lane and electromagnetic shielding walls on either side, reducing leakage magnetic fields by directing magnetic flux orthogonal to the travel direction and using magnetic and conductive walls to minimize external leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the axial direction of power transmitting and power receiving coils is in the up-down direction to enable wireless power transmission, then power transmission can be performed, but the intensity and distribution of leakage magnetic field significantly change depending on the relative position relationship of the coils
Solution Approach 1:
The patent changes the orientation of the coils from the up-down direction (vertical dimension) to the width direction of the travel lane (horizontal dimension). This dimensional change redirects the leakage magnetic field to propagate horizontally along the travel lane rather than vertically, reducing its intensity and distribution variability as the vehicle moves.
Solution Approach 2:
The patent introduces electromagnetic shielding members positioned between the power transmitting coil and the surrounding environment. These shielding members act as intermediaries that block and contain the leakage magnetic field, preventing it from spreading to nearby electronic devices and reducing electromagnetic disturbance.
2Object-affected harmful factors
If electromagnetic shielding members are used to reduce leakage magnetic field, then electromagnetic disturbance is reduced, but magnetic flux leakage occurs between shielding members when relative position changes
Solution Approach 1:
The patent merges multiple electromagnetic shielding members into a continuous or closely connected shielding structure along the travel lane. By combining the shielding members, the patent eliminates gaps between them, preventing magnetic flux leakage while maintaining the ability to reduce electromagnetic disturbance to nearby devices.
3Power
If a large current is supplied to the coil to transmit a large amount of power, then power transmission capability is improved, but the intensity of leakage magnetic field increases causing electromagnetic disturbance
Solution Approach 1:
The electromagnetic shielding members serve as intermediaries that contain and redirect the leakage magnetic field generated by high-current operation. The shielding members block the magnetic field from spreading to surrounding areas, allowing high power transmission without proportionally increasing electromagnetic disturbance to nearby electronic 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
Effectively reduces leakage magnetic fields even with changing relative positions, maintaining power transmission efficiency and minimizing electromagnetic interference.
Implementation Method 1
a wireless power transmission technique using an electromagnetic induction interaction between a primary (power transmitting) coil and a secondary (power receiving) coil
Implementation Method 2
electromagnetic shielding walls that are disposed on respective sides of the travel lane in an extension direction of the travel lane
Data Source
AI summary
A wireless power supply system is a wireless power supply system provided with a travel lane for wirelessly transmitting power to a moving body and includes a power transmitting coil that is disposed such that the axial direction of the coil is substantially parallel to the width direction of the travel lane, and electromagnetic shielding walls that are disposed on the respective sides of the travel lane in the extension direction of the travel lane.