LF Coil Alignment and Authentication for EV Wireless Charging
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Solution Overview
Problem
Conventional alignment methods for wireless charging in electric vehicles are inefficient and prone to user intervention, coil misalignment, and system performance degradation due to coil misalignment, leading to reduced power transfer efficiency and stability.
Innovation Solution
A position alignment method and apparatus using low-frequency signals to align a primary coil of a charging station with a secondary coil of an electric vehicle, involving recognition of ground assemblies, selection of a target assembly, and authentication through LF signals for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional alignment methods (rear camera or movable charging pad) are used, then user intervention is required and alignment is inconvenient, but the system complexity and device complexity increase
Solution Approach 1:
The patent replaces mechanical alignment methods (movable charging pad) and visual alignment methods (rear camera) with a magnetic field-based detection system. The detection coil and controller automatically detect coil alignment status through magnetic coupling signals, eliminating the need for mechanical movement or visual user intervention, thus improving ease of operation while reducing system complexity.
Solution Approach 2:
The alignment detection system operates autonomously without user intervention. The controller automatically detects the alignment status between primary and secondary coils through the detection coil, and the system self-adjusts or self-optimizes the wireless power transfer based on detected alignment, making the system self-servicing and eliminating manual alignment operations.
2Measurement precision
If conventional alignment methods are used, then user intervention is required, but the alignment precision and power transfer efficiency decrease due to coil misalignment
Solution Approach 1:
The patent uses magnetic field detection through a detection coil to precisely measure alignment status between primary and secondary coils. This electromagnetic detection method provides higher measurement precision compared to visual or mechanical methods, enabling accurate detection of coil position and orientation, thereby maximizing power transfer efficiency and minimizing energy loss due to misalignment.
Solution Approach 2:
The detection coil continuously monitors the magnetic coupling signal between primary and secondary coils, providing real-time feedback to the controller about alignment status. The controller uses this feedback to optimize wireless power transfer parameters or guide alignment adjustments, ensuring precise alignment is maintained throughout the charging process, thus preventing energy loss from misalignment.
3Productivity
If magnetic resonance wireless power transfer is used, then wireless charging efficiency is improved, but the system becomes highly sensitive to coil misalignment causing performance degradation
Solution Approach 1:
The detection coil provides continuous feedback on the magnetic coupling status between primary and secondary coils in the magnetic resonance wireless power transfer system. This feedback mechanism allows the controller to detect even slight misalignments and adjust operating parameters or guide realignment, maintaining system stability and reliability while preserving the high wireless charging efficiency of magnetic resonance technology.
Solution Approach 2:
The patent replaces mechanical alignment verification methods with electromagnetic field-based detection using the detection coil. This substitution enables non-contact, high-precision monitoring of coil alignment status, reducing the system's sensitivity to mechanical misalignment variations and improving overall system reliability while maintaining high wireless charging efficiency.
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 precise alignment of coils, enhancing wireless charging efficiency and system stability by minimizing coil misalignment issues and interference, ensuring optimal power transfer.
Implementation Method 1
a detection coil configured to detect an alignment status between the primary coil and the secondary coil
Implementation Method 2
Wireless charging of a battery for driving the motor of EV may be performed by combining a primary coil of a charging station and a secondary coil of the EV in a magnetic resonance scheme
Data Source
AI summary
A position alignment method comprises recognizing the state of the plurality of GAs through wireless communication with an SECC for controlling the plurality of GAs, receiving information about one or more valid GAs among the plurality of GAs from the SECC, selecting a target GA on the basis of the information about the one or more valid GAs, and establishing a wireless communication link; making a request to the SECC for performing a position alignment approval and authentication process, performing position alignment with the target GA using an LF signal if the authentication is successful, transmitting a dataset to the SECC using the LF signal after the position alignment with the target GA, and pairing with the target GA based on the dataset.