Coil Topologies for Wireless EV Charging Efficiency
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Solution Overview
Problem
Existing wired charging systems for electric vehicles are inconvenient and cumbersome due to the need for physical cables and connectors, which can be prone to wear and exposure to environmental elements, and lack efficient power transfer capabilities.
Innovation Solution
A wireless power transfer system using magnetic flux devices with conductive coils and magnetically permeable materials to transmit and receive power wirelessly, optimizing coil configurations and resonant frequencies for efficient energy coupling between a base system and an electric vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wired charging connections with cables and connectors are used, then power transfer is reliable and efficient, but the system becomes inconvenient and cumbersome due to physical connections
Solution Approach 1:
The patent replaces the mechanical wired charging system with a wireless electromagnetic induction system. The mechanical connectors and cables are substituted by magnetic fields generated between a base coil and a vehicle coil, eliminating physical contact points while maintaining power transfer functionality. This resolves the contradiction by removing the inconvenience of physical connections while preserving reliable power transfer through electromagnetic coupling.
Solution Approach 2:
The patent introduces magnetically permeable material as an intermediary between the base coil and vehicle coil to enhance magnetic flux coupling. This intermediary component strengthens the magnetic field interaction, ensuring reliable power transfer in the wireless system. The mediator compensates for the loss of direct mechanical connection by optimizing the electromagnetic coupling pathway.
2Reliability
If wired charging connections are used, then power transfer efficiency is maintained, but the system exposes components to wear and environmental elements
Solution Approach 1:
The patent eliminates mechanical wear and environmental exposure by replacing wired connections with wireless electromagnetic induction. The base coil and vehicle coil transfer power through magnetic fields without physical contact, preventing wear on connectors and protection against environmental damage while maintaining efficient energy transfer through optimized magnetic coupling.
Solution Approach 2:
The patent employs magnetically permeable composite materials in the coil structure to enhance magnetic flux density and improve power transfer efficiency. These composite materials optimize the magnetic circuit, ensuring that wireless power transfer achieves efficiency comparable to or exceeding wired systems while providing the durability benefits of wear-free operation.
3Ease of operation
If wireless power transfer is implemented, then convenience is improved by eliminating cables, but power transfer efficiency may be reduced
Solution Approach 1:
The patent employs resonant oscillation at specific frequencies in both the base coil and vehicle coil to maximize electromagnetic coupling efficiency. By tuning the system to resonate at matching frequencies, the wireless power transfer achieves high efficiency comparable to wired systems. The resonant vibration of magnetic flux lines enhances energy transfer while maintaining the wireless convenience advantage.
Solution Approach 2:
The patent uses magnetically permeable composite materials to concentrate and direct magnetic flux between the coils, minimizing energy loss through leakage and improving overall transfer efficiency. These materials create optimized magnetic pathways that maintain high efficiency in the wireless system while preserving the convenience of cable-free operation.
4Reliability
If wireless charging system is used, then exposure to environmental elements is reduced, but device complexity increases due to coil configurations
Solution Approach 1:
The patent replaces exposed mechanical charging components with enclosed wireless coil systems that are protected from environmental elements. The base coil and vehicle coil can be integrated into protected housings, shielding them from moisture, dust, and other environmental factors. The increased complexity of electromagnetic design is traded for improved environmental protection and reduced maintenance requirements.
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
Enables convenient, efficient, and safe wireless charging of electric vehicles by eliminating the need for physical connections, reducing wear and exposure risks, and improving power transfer efficiency through optimized coil configurations and resonant frequencies.
Implementation Method 1
A wireless power transfer system using magnetic flux devices with conductive coils and magnetically permeable materials to transmit and receive power wirelessly
Implementation Method 2
magnetic flux devices with conductive coils and magnetically permeable materials to transmit and receive power wirelessly, optimizing coil configurations and resonant frequencies for efficient energy coupling
Implementation Method 3
optimizing coil configurations and resonant frequencies for efficient energy coupling between a base system and an electric vehicle
Data Source
AI summary
This disclosure provides systems, methods and apparatus including a magnetic flux device configured to transmit or receive magnetic flux to or from a space beyond the magnetic flux device. In certain configurations, the magnetic flux device can include a first coil with a first layer and second layer, a second coil with a third layer and fourth layer, and a magnetically permeable material with the first coil extending over a first edge of the magnetically permeable material and the second coil extending over a second edge of the magnetically permeable material. In certain other configurations, the magnetic flux device can include a first conductive structure including a first coil and a second coil enclosing a first area and a second area, respectively. The magnetic flux device can further include a second conductive structure with at least a first planar portion of the first conductive structure being substantially coplanar with a second planar portion of the second conductive structure.