Wireless Charging Coil Alignment via Coupling Factor Feedback
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Solution Overview
Problem
Existing electric vehicle charging systems face inefficiencies due to misalignment of ground and vehicle coils, leading to energy loss and safety issues, as they require precise positioning for optimal power transfer and minimize stray currents.
Innovation Solution
The system utilizes the coupling factor between coils to assist in aligning the vehicle relative to the ground pad module, employing sensors and transducers for haptic feedback to guide the driver into optimal positioning, ensuring accurate alignment and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless power transfer is implemented without precise alignment assistance, then the system is simpler and easier to operate, but power transfer efficiency decreases and energy loss increases
Solution Approach 1:
The system employs sensors to detect the relative position between ground and vehicle coils, then provides real-time feedback to the driver through the user interface. This feedback mechanism enables the driver to adjust vehicle positioning to optimize coupling factor and minimize energy loss during wireless power transfer.
Solution Approach 2:
The alignment assistance system activates before power transfer begins, detecting coil positions and guiding the driver to optimal positioning in advance. This preliminary alignment ensures maximum coupling efficiency is achieved before the power transfer process starts, preventing energy loss from misalignment.
2Loss of energy
If precise positioning is required for optimal power transfer, then energy loss is reduced, but the ease of operation decreases as drivers must manually align vehicles
Solution Approach 1:
The system employs sensors to detect the relative position between ground and vehicle coils, then provides real-time feedback to the driver through the user interface. This feedback mechanism enables the driver to adjust vehicle positioning to optimize coupling factor and minimize energy loss during wireless power transfer.
Solution Approach 2:
The system replaces manual mechanical alignment with an automated sensor-based detection and electronic feedback system. Sensors automatically measure coil positions and the electronic user interface provides guidance, substituting the need for manual trial-and-error positioning with an automated guidance system.
3Reliability
If manual alignment is used without guidance systems, then the device complexity is lower, but misalignment causes safety issues and energy loss
Solution Approach 1:
The system employs sensors to detect the relative position between ground and vehicle coils, then provides real-time feedback to the driver through the user interface. This feedback mechanism enables the driver to adjust vehicle positioning to optimize coupling factor and minimize energy loss during wireless power transfer.
Solution Approach 2:
The user interface acts as an intermediary between the sensor detection system and the driver. It translates raw sensor data about coil positions into actionable guidance information, mediating the connection between the complex sensing system and the simple driver action needed to achieve proper alignment.
4Measurement precision
If sensors and transducers are added for alignment feedback, then alignment precision improves, but manufacturing cost increases
Solution Approach 1:
The system uses existing vehicle sensors and transducers for multiple purposes - both for general vehicle operation and for the specific function of coil alignment detection. This multi-functionality reduces the need for dedicated expensive alignment sensors, lowering manufacturing costs while maintaining measurement precision.
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 enhances the efficiency of power transfer by maximizing the coupling factor, reducing energy loss and safety risks, while providing cost-effective and accurate alignment assistance for the driver during parking.
Implementation Method 1
transfer power magnetically from one pad module to another
Implementation Method 2
power may be transferred wirelessly, including capacitive coupling and inductive coupling
Implementation Method 3
resonant inductive power transfer
Implementation Method 4
The coupling factor between coils in a wireless charging system provides an indication of distance between the coils
Data Source
Figure 1
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Figure 4~6
AI summary
The coupling factor between coils in a wireless charging system provides an indication of distance between the coils. The indication of distance can be used to assist in driving the vehicle to control the relative position between the coils. The indication of distance can be used in a vehicle positioning together with a location sensor to system calculating a path to a parking position. Transducers may be used to provide haptic feedback for a driver of the vehicle based on the indication of distance on the vehicle relative to a parking position.