Multi-Phase Coil Layout for Stable Dynamic Vehicle Wireless Charging
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Solution Overview
Problem
Existing wireless power transfer systems using single multi-layer coil modules struggle to maintain continuous and stable power reception for vehicles in motion, particularly when driving, due to challenges in managing the strength and distribution of the magnetic field along the path of travel.
Innovation Solution
A wireless power transfer apparatus comprising two or more adjacently arranged multi-phase, multi-layer coil modules, with a controller adjusting the phase of current supply to each coil module based on its type, such as 180 degrees for unipolar coils and 0 degrees for bipolar coils, to optimize magnetic field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single multi-layer coil module is used, then the device complexity is reduced, but the power reception continuity and stability deteriorates when a vehicle is driving
Solution Approach 1:
The patent divides the wireless power transfer system into multiple adjacently arranged coil modules (first, second, and third coil modules) positioned at different locations along the vehicle's travel path. Each module can independently transmit power, ensuring continuous power supply as the vehicle moves through different zones, thus resolving the contradiction between simple configuration and reliable continuous power reception.
2Reliability
If two or more adjacently arranged coil modules are used, then the power reception continuity is improved, but the magnetic field distribution becomes more complex to manage
Solution Approach 1:
The patent applies different phase shift configurations to different coil modules based on their specific positions and orientations. The controller adjusts the phase of currents supplied to each adjacently arranged coil module according to its type (unipolar or bipolar), creating locally optimized magnetic field distributions that collectively provide stable power reception throughout the vehicle's path.
3Ease of manufacture
If unipolar type coils are used, then the manufacturing is simplified, but the magnetic field strength distribution becomes less optimal for moving vehicles
Solution Approach 1:
The patent maintains the simplicity of unipolar coil construction while compensating for magnetic field distribution limitations by dynamically adjusting the phase of currents supplied to different coil modules. This parameter adjustment allows the system to optimize magnetic field strength and coverage for moving vehicles without changing the basic unipolar coil structure, thus maintaining ease of manufacture while improving power transmission effectiveness.
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
Ensures uniform power supply to vehicles regardless of position or speed, enhancing the application range and reliability of wireless power transfer technology.
Implementation Method 1
a controller configured to adjust a phase of a current supplied to each of the two or more adjacently arranged wireless power transfer coil modules according to a coil type of the wireless power transfer coil modules
Data Source
AI summary
An apparatus for wirelessly transmitting power to a vehicle that is stopped or driving is provided. The wireless power transfer apparatus includes multi-phase, multi-layer coils arranged in the direction of travel of the vehicle. By adjusting the phase of the current supplied to adjacently arranged wireless power transfer coil modules, the continuity and stability of power reception are improved, enabling a uniform power supply to the moving vehicle. This enhances the application range and reliability of the wireless power transfer apparatus.