Multi-Coil Wireless Power Transfer Alignment Tolerance
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Solution Overview
Problem
Existing wireless power transfer systems for electric vehicles have limited tolerance to coil misalignment, particularly in the longitudinal and transverse directions, which affects the efficiency and reliability of power transfer.
Innovation Solution
A wireless power transfer system utilizing three co-planar receiver coils, where the first two coils are positioned centrally to the third coil, with a controller determining and enabling the current and duty cycle to optimize power transfer based on alignment and current comparisons between the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiver coil is used in the wireless power transfer system, then the device complexity is reduced, but the alignment tolerance and power transfer efficiency deteriorate when coils are misaligned
Solution Approach 1:
The receiver coil is divided into three separate coils (first, second, and third receiver coils) arranged in a specific geometric pattern. This segmentation allows each coil to independently contribute to power transfer, enabling the system to maintain efficiency across a wider range of alignment conditions while providing redundancy if one coil becomes misaligned.
2Ease of operation
If the current is distributed equally among all receiver coils, then the control simplicity is maintained, but the power transfer efficiency deteriorates when alignment conditions vary
Solution Approach 1:
The system dynamically adjusts the current distribution among the three receiver coils based on real-time alignment detection. The controller monitors the magnetic coupling between transmitter and receiver coils and redistributes current to optimize power transfer efficiency under varying alignment conditions, transitioning from static equal distribution to dynamic adaptive distribution.
Solution Approach 2:
The system incorporates feedback mechanisms to detect the alignment state between transmitter and receiver coils. Based on this feedback information, the controller adjusts the current distribution among the three receiver coils to maintain optimal power transfer efficiency, creating a closed-loop control system that adapts to changing conditions.
3Adaptability or versatility
If wireless power transfer is implemented without multi-coil configuration, then the system simplicity is maintained, but the convenience and reliability deteriorate due to strict alignment requirements
Solution Approach 1:
The system merges three receiver coils into a unified receiver assembly that works cooperatively as a single functional unit. This combination provides both the alignment flexibility of multiple coils and the simplified control of a unified system, allowing the receiver to accommodate various transmitter positions while maintaining efficient power transfer.
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
The system improves alignment tolerance and power transfer efficiency by dynamically adjusting the current distribution among the coils, enhancing the overall reliability and convenience of wireless charging.
Implementation Method 1
wireless power transfer system utilizing three co-planar receiver coils... configured to electrically connect to a load... determine a current of the co-planar first and second receiver coils, a current of the third receiver coil
Data Source
AI summary
This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote systems such as electric vehicles. In one aspect, a system comprises substantially co-planar first and second receiver coils. The system further comprises a third receiver coil. The system further comprises a controller configured to determine a current of the co-planar first and second receiver coils, a current of the third receiver coil, and a duty cycle of the wireless power transfer receiver device. The controller is configured to enable the co-planar first and second receiver coils, the third receiver coil, or the co-planar first and second receiver coils and the third receiver coil based on a comparison of the current of the co-planar first and second receiver coils, the current of the third receiver coil, and the duty cycle.