基于分布式发射线圈的WPT抗偏移与互操作性研究

Anti-deflection and interoperability study of WPT based on distributed transmitting coils

无线电能传输系统中接收端与发射端之间相对位置的偏移会在一定程度上影响系统传输效率,笔者从耦合机构的全范围抗偏移性、互操作性2个方面进行研究,提出一种多对一的耦合模式,发射线圈类型为平面分布式发射单元线圈组合,对不同的接收线圈类型、轴向偏移工况和旋转偏移工况的位置模态研究分布式发射线圈的开启模式,实现接收线圈的互操作性和大范围全方向的抗偏移性。为提高分布式发射线圈的自由度,提出分布式串联控制逻辑电路,并对发射线圈串联连接工况下的谐振参数进行设计以减少交叉耦合影响。结合分布式发射线圈的磁场特性和基于LCC-S谐振拓扑的拾取电压检测法,提出接收线圈位置检测的搜索策略。搭建实验装置,综合所有位置的轴向偏移及旋转偏移,平面式接收线圈的最大效率波动为3.3%,垂直式接收线圈的最大效率波动为5.57%,螺线管式接收线圈的最大效率波动为4.45%,实验结果表明,其具有良好的抗偏移特性与互操作性,验证了系统的可行性、高效性。

The offset in the relative position between the receiver and the transmitter in a radio energy transmission system can significantly impact transmission efficiency.We investigate the full-range offset resistance and the interoperability of the coupling mechanism,and propose a novel many-to-one coupling mode.By utilizing planar distributed transmit unit coil combination and studying the open mode of the distributed transmit coil with various receive coil types,axial offset conditions and rotational offset conditions,the interoperability and wide-range all-directional offset resistance of the receive coil is achieved.To improve the degree of freedom of the distributed transmit coil,a distributed series control logic circuit is proposed,and the resonance parameters of the transmit coil are designed for series connection condition to reduce cross-coupling effect.A search strategy for receiving coil position detection is proposed by combining the magnetic field characteristics of the distributed transmit coil with a pickup voltage detection method based on the LCC-S resonant topology.An experimental setup is constructed with considering axial and rotational offsets in all positions. The maximum efficiency fluctuation of the planar receiving coil is found to be 3.3%, the maximum for the vertical receiving coil is 5.57%, and for the solenoid receiving coil is 4.45%. Experimental results show that the proposed system exhibits good anti-offset characteristics and interoperability, verifying the feasibility and efficiency of the system.