Movable Dual-Subcoil Layout for Misaligned EV Wireless Charging
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Solution Overview
Problem
Existing wireless power transfer systems for vehicle charging face inefficiencies due to mismatched coil topologies between the transmitter and receiver, requiring precise alignment and struggling to optimize power transfer across various power classes and Z-classes.
Innovation Solution
A device with a coil comprising two sub-coils formed by a continuous conductor wire, allowing for adjustable magnetic field matching by movable sub-coils, thereby enhancing electromagnetic coupling and charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed coil topology is used in the base pad, then the device structure is simple, but it cannot efficiently transfer power to all different receiver coil types and positions
Solution Approach 1:
The transmitter coil is divided into two separate movable sub-coils that can be independently positioned. This segmentation allows each sub-coil to be adjusted to match different receiver coil configurations, enabling compatibility with various receiver types while maintaining a relatively simple overall structure.
Solution Approach 2:
The sub-coils are made movable relative to each other, transforming the fixed coil structure into a dynamic one. This mobility allows the transmitter to adapt its magnetic field configuration in real-time to match different receiver positions and orientations, solving the versatility problem without requiring multiple fixed coil configurations.
2Productivity
If precise alignment between base pad and vehicle pad is required, then power transfer efficiency is high, but the alignment tolerance interval is narrow and positioning is difficult
Solution Approach 1:
The movable sub-coils can dynamically adjust their positions to compensate for misalignment between the base pad and vehicle pad. This dynamic adjustment capability maintains efficient electromagnetic coupling even when initial alignment is imperfect, thereby broadening the acceptable alignment tolerance interval.
Solution Approach 2:
By changing the spatial parameters (positions) of the sub-coils, the system adapts to different alignment conditions. This parameter adjustment allows the transmitter to optimize magnetic field coupling for various receiver positions, maintaining charging efficiency across a wider range of alignments.
3Adaptability or versatility
If a single coil configuration is used, then the device structure is simple, but it cannot optimize magnetic field for different power classes and Z-classes
Solution Approach 1:
Dividing the coil into two separate movable sub-coils enables independent positioning and configuration optimization for different power classes and Z-classes, while keeping each individual sub-coil structurally simple.
Solution Approach 2:
The movable dual sub-coil configuration serves multiple functions: it can be arranged to optimize magnetic fields for different power classes, different Z-classes (ground clearances), and different receiver coil topologies, making a single device universally applicable across various charging scenarios.
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 improves the alignment tolerance and efficiency of wireless charging by dynamically adjusting the magnetic field to match different coil types and positions, enabling efficient power transfer across multiple power classes and Z-classes.
Implementation Method 1
a first coil of a transmitter is arranged in a base pad on the floor or the ground, and a second coil of a receiver is arranged at the underside of the vehicle in a vehicle pad
Implementation Method 2
by relative movement of the first sub coil and the second sub coil, the magnetic field of a transmitter can be adjusted to the current conditions for matching the coil type and coil position of a receiver
Data Source
AI summary
A device for a wireless power transfer system for charging a vehicle. The device includes a coil having a first sub coil and a second sub coil both formed by one and the same continuous conductor wire. The first sub coil and the second sub coil are movably arranged relative to each other for adjustment of the charging characteristics of the device.