Wireless Charging Coil Array with Adjustable Flux Angle
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Solution Overview
Problem
Wireless charging of electric vehicles is inefficient when the induction coil in the vehicle is not directly aligned with the power transmitter coil, leading to reduced power transfer efficiency and potential failure during misalignment, especially in dynamic charging systems where the vehicle is in motion.
Innovation Solution
A wireless charging system with multiple parallel coils and cross-coil junction units that can control current flow to adjust the magnetic flux angle optimally based on the vehicle's position, ensuring efficient energy transfer even during misalignment by calculating switching times and intervals based on vehicle speed and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single primary coil is used for wireless charging, then the system structure is simple, but power transfer efficiency drops significantly when the vehicle is misaligned with the charging position
Solution Approach 1:
The primary coil is divided into multiple independent coil segments arranged in an array. Each segment can be independently controlled to generate magnetic flux. This segmentation allows the system to activate only the segments needed for efficient power transfer, reducing energy loss while maintaining manageable system complexity through modular design
Solution Approach 2:
The system dynamically selects and activates specific coil segments based on the real-time position of the vehicle. This dynamic adaptation ensures optimal alignment between the active primary coil segments and the vehicle's secondary coil, maintaining high power transfer efficiency regardless of vehicle positioning, while the inactive segments remain dormant to avoid adding unnecessary complexity
2Reliability
If multiple parallel coils with cross-coil junction units are used to adjust magnetic flux angle, then power transfer efficiency is maintained during misalignment, but the device complexity increases
Solution Approach 1:
The primary coil system is segmented into multiple parallel coils with defined cross-coil junction units. This segmentation creates a modular structure where each coil and junction unit can be independently controlled to adjust the magnetic flux angle, improving reliability during misalignment while the modular nature keeps the overall system complexity manageable
Solution Approach 2:
The system changes the magnetic flux angle parameter by selectively activating specific coil segments and controlling current flow through cross-coil junction units. This parameter adjustment allows the system to adapt to different vehicle positions and maintain optimal coupling, improving charging reliability without requiring complete redesign of the coil structure
3Productivity
If the magnetic flux angle is adjusted dynamically based on vehicle position, then charging efficiency is maintained over larger distances, but the control system complexity increases
Solution Approach 1:
The system uses vehicle position detection as feedback to dynamically control which coil segments are activated and how current flows through the cross-coil junction units. This feedback mechanism enables automatic adjustment of the magnetic flux angle to maintain optimal coupling over varying distances, improving productivity while the automated control reduces the need for complex manual intervention
Solution Approach 2:
The system pre-configures multiple coil segments and cross-coil junction units in advance, ready to be activated based on detected vehicle position. This preliminary arrangement allows rapid response to vehicle positioning without requiring complex real-time calculations, maintaining charging efficiency over distance while simplifying the control logic
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 solution enhances power transfer efficiency by adjusting the magnetic flux angle to maintain optimal coupling with the vehicle's induction coil, allowing for charging over a larger distance and reducing the impact of misalignment, thereby improving the overall efficiency and reliability of dynamic wireless charging.
Implementation Method 1
wireless charging relies on an electromagnetic field to transfer energy between a charging station (e.g., wireless charging assembly) and an electrical device... An induction coil in the wireless charging assembly (i.e., primary coil) uses electricity, often provided from the power grid, to create an alternating electromagnetic field
Implementation Method 2
An induction coil in the electrical device (i.e., secondary coil) may then receive power from the generated electromagnetic field and convert it back into electrical current to charge its battery... efficient wireless power transfer between the primary and secondary coils depends on proper alignment between the two coils
Data Source
AI summary
A method includes: detecting a position of a moving, wireless charging-capable vehicle which travels over a primary coil of a wireless charging system operable to wirelessly charge the vehicle via a secondary coil installed in the vehicle; controlling the plurality of cross-coil junction units such that electric current flows through one or both of the top coil and the bottom coil in a manner which produces a first angle of magnetic flux for optimally wirelessly charging the vehicle given a position of the primary coil in relation to the detected position of the vehicle; and when a switching time occurs, controlling the plurality of cross-coil junction units to change the flow of electric current through one or both of the top coil and the bottom coil in a manner which produces a second angle of magnetic flux for optimally wirelessly charging the vehicle given the position of the primary coil in relation to an updated position of the vehicle as the vehicle traverses the primary coil.