Wireless Power Coil Layout for Two-Axis Position Detection
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Solution Overview
Problem
Existing wireless power transfer systems for electric vehicles face increased costs and complexity due to the use of dedicated detection coils for position detection, and accuracy issues arise when reusing the coil of the coupling mechanism as a detection coil, limiting detection to a single direction.
Innovation Solution
A wireless power transfer system with a position detection function that utilizes a magnetically integrated resonant coil and a signal receiving coil to detect position offsets along the X and Y axes, respectively, while reusing these coils for detection, and employs a single-pole double-throw switch to control their connection during position adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated detection coils are used for position detection, then position detection accuracy is improved, but system cost and complexity increase
Solution Approach 1:
The patent applies multi-functionality by enabling the coupling coils to serve dual purposes: both for wireless power transfer and for position detection. The same coils that transmit power are used to detect position offsets through magnetic coupling changes, eliminating the need for separate dedicated detection coils and thereby reducing system complexity while maintaining detection accuracy
Solution Approach 2:
The patent merges the power transfer function and position detection function into a single integrated system. By combining these two functions that were previously performed by separate components, the system achieves cost reduction and simplified architecture while maintaining the capability to accurately detect receiver position
2Device complexity
If the coil of the coupling mechanism is reused as a detection coil, then system complexity is reduced, but detection accuracy is limited to a single direction
Solution Approach 1:
The patent transitions from single-direction detection to two-dimensional detection by utilizing the spatial arrangement of coupling coils. By detecting magnetic coupling changes in multiple spatial dimensions and processing these signals, the system achieves accurate position detection in both X and Y directions using the same coupling coils, thereby overcoming the single-direction limitation
Solution Approach 2:
The patent segments the position detection function into orthogonal components (X-direction and Y-direction detection). By separately processing magnetic coupling signals to extract position information in each direction independently, the system achieves comprehensive two-dimensional position detection while using the same physical coils, thus maintaining simplicity while improving detection capability
3Reliability
If alignment accuracy is improved, then power transfer efficiency is improved, but system complexity increases due to additional detection mechanisms
Solution Approach 1:
The patent applies multi-functionality by enabling the coupling coils to serve dual purposes: both for wireless power transfer and for position detection. The same coils that transmit power are used to detect position offsets through magnetic coupling changes, eliminating the need for separate dedicated detection coils and thereby reducing system complexity while maintaining detection accuracy
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 approach reduces system complexity, improves coil utilization, and enhances alignment accuracy by simultaneously detecting positions in two directions, achieving high alignment accuracy and efficient power transfer with a DC-DC transmission efficiency of 94.6% and communication speed of 24.8 Mbps.
Implementation Method 1
the change of a magnetic field is sensed by detection coils to identify the change of the position of the receiver
Implementation Method 2
alignment of primary-side and secondary-side magnetic coupling mechanisms
Implementation Method 3
wireless power transfer (EV-WPT) systems
Implementation Method 4
magnetically integrated resonant coil
Data Source
AI summary
The present disclosure provides a wireless power transfer system with a position detection function and a position adjustment method therefor, the system includes an energy transmission component and a signal transmission component, where the energy transmission component includes a power transmitting coil, a power receiving coil and a magnetically integrated resonant coil, and the signal transmission component includes a signal transmitting coil and a signal receiving coil; the power transmitting coil, the magnetically integrated resonant coil and the signal transmitting coil are sequentially stacked, and the power receiving coil and the signal receiving coil are stacked. During position detection, the magnetically integrated resonant coil and the signal receiving coil as detection coils detect position offsets along an X-axis and a Y-axis, respectively. Positions in two directions are detected simultaneously, and the reuse of coils reduces the complexity of the system, and improves the utilization rate of the coils.