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| Adaptive Region Division Positioning Strategy for Array-Based Wireless Power Transfer System |
| Wen Feng1, Wang Lei1, Zhang Xiang2, Tan Linlin3, Fang Xin4 |
1. School of Automation Nanjing University of Science and Technology Nanjing 210014 China;
2. Shanghai Institute of Mechanical and Electrical Engineering Shanghai 201109 China;
3. School of Electrical Engineering Southeast University Nanjing 210096 China;
4. State Grid Jiangsu Electric Power Company Electric Power Science Research Institute Nanjing 211103 China |
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Abstract Unforeseen misalignment between transmitter and receiver coils significantly impacts the performance of wireless power transfer (WPT) systems. The array WPT system can extend the effective charging area and reduce the influence of misalignment by optimizing the power orientation of the receiver coil. Accurate positioning of the receiver coil is crucial for achieving optimal power orientation in array WPT systems. Therefore, this paper introduces a region division-based receiver positioning strategy for planar array WPT systems without additional detecting coil or position sensors. The receiver coil can be precisely positioned by analyzing the current of the transmitter array.
A 2×2 array coil is employed as the research subject, requiring only 4 transmitter coils for positioning purposes. The paper demonstrates the theoretical derivation, simulation validation, and experimental results of the precise positioning of the receiver coil. A minimum cross-coupling design of the transmitter coil is carried out. Subsequently, the paper derives a coordinate calculation formula by fitting the relationship between the current of the transmitter coils and the coordinates of the receiver coil. This paper divides the region with randomly placed receiver coil into regions based on preset positioning accuracy. The optimal reference points for each region are dynamically optimized to ensure that positioning accuracy aligns with preset requirements. Finally, by analyzing changes in the transmitter coil current between the undetermined point and the optimal reference point of the receiver coil, the paper calculates the corresponding coordinate changes.
Changes in the load resistance can induce the full-bridge rectifier on the output side to transition into the discontinuous conduction mode, resulting in a surge in harmonic current content in the receiver coil. This paper theoretically analyzes the impact of harmonics at the receiver coil on the transmitter coil current after the full-bridge rectifier enters the discontinuous conduction mode. In continuous conduction mode, the accuracy of the proposed positioning strategy is predominantly influenced by the equivalent resistance of the full-bridge rectifier. Through the parallel small capacitance method, experiments validate that the transmitter coil current remains consistent irrespective of the full-bridge rectifier. Consequently, maintaining equivalent load consistency ensures the positioning accuracy of the proposed strategy, thereby expanding its application scope.
The experimental results show an average positioning error of 9.98 mm within the 329 mm×329 mm area, satisfying the preset positioning accuracy criterion of 10 mm. Moreover, compared to existing positioning strategies in wireless power transfer systems, the proposed approach offers distinct advantages of positioning accuracy and the necessity for additional devices.
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Received: 28 November 2023
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2024, Vol. 39 
