Wireless Power Coupler Layout for Misalignment-Tolerant EV Charging
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Solution Overview
Problem
Existing inductive power transfer (IPT) systems for wireless charging face challenges such as complex and costly coil configurations, sensitivity to misalignment, and high-frequency operation difficulties, particularly in dynamic charging applications like electric vehicles (EVs).
Innovation Solution
The design incorporates a primary coupling member with a conducting layer configured to distribute current alternately across its length, generating a magnetic field on one side without return paths, allowing for efficient and cost-effective wireless power transfer with improved misalignment tolerance, using a flat conductor like copper foil or litz wire, and a vertically oriented receiving coil with minimal flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex coil configurations are used in existing IPT magnetic structures, then power transfer performance can be improved, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent divides the primary coupler into multiple discrete coil segments arranged in a specific geometric pattern. Each segment can be independently manufactured and positioned, simplifying the overall construction while maintaining the magnetic field requirements for effective power transfer. This segmentation approach reduces manufacturing complexity compared to traditional single-piece complex coil designs.
2Power
If large inductance values are used in existing IPT magnetic structures, then power transfer capability is improved, but high-frequency operation becomes difficult and compensation circuits are required
Solution Approach 1:
The patent optimizes the inductance values of the coil segments and their mutual couplings to achieve an balanced design that enables effective power transfer at high operating frequencies without requiring additional compensation circuits. By carefully selecting geometric parameters and coil configurations, the system achieves the desired power transfer capability while maintaining compatibility with high-frequency operation.
3Reliability
If traditional IPT magnetic structures are used, then power transfer can be achieved, but sensitivity to misalignment increases
Solution Approach 1:
The patent employs an asymmetric geometric arrangement of coil segments in the primary coupler, which creates a magnetic field distribution that is more tolerant to misalignment between primary and secondary couplers. This asymmetric configuration ensures that power transfer performance remains stable even when perfect alignment is not achieved, thereby improving adaptability to real-world positioning variations.
4Reliability
If existing IPT magnetic structures are used, then wireless power transfer can be implemented, but manufacturing cost increases due to complex configurations
Solution Approach 1:
The patent utilizes thin-film fabrication techniques to create the coil segments and magnetic structures, enabling cost-effective manufacturing through standardized processes. This approach replaces complex mechanical assembly with planar thin-film deposition and patterning, significantly reducing manufacturing costs while maintaining the required magnetic coupling performance for wireless power transfer.
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 enables stable, efficient, and economical dynamic charging for EVs by maintaining a consistent magnetic flux pattern, reducing manufacturing costs, and enhancing alignment flexibility, thereby improving the overall performance and reliability of wireless power transfer systems.
Implementation Method 1
IPT systems operate using magnetic couplers, one being a primary or transmitter magnetic structure (often referred to as primary coupler or pad) to make a magnetic field available to couple with a secondary or receiver magnetic structure
Implementation Method 2
the conducting member extends from the first end to the second end and is configured to distribute current alternately across the layer between the first and second ends
Data Source
AI summary
A wireless power transfer coupling apparatus, comprising: at least one conductive member configured as a layer of the first coupling member to provide a magnetic field for wireless power transfer, the conductive member having: a first end; and a second end opposite the first end, wherein: the conductive member extends from the first end to the second end along a lengthwise axis of the coupling apparatus and is configured to distribute current across the layer between the first and second ends. The conductive member comprising a layer of permeable material that extends on the either side to form pole area and further extending in a direction toward a magnetic flux coupling region. The wireless power transfer apparatus further comprising an uncompensated primary coupler and a capacitor compensated secondary that compensates the reactance of the primary coupler by a reflected impedance.