摘要
随着无线充电技术场景的广泛应用,传统的同尺寸收发线圈一对一充电形式并不能满足生产生活的需求,无线充电在一些特殊的场景下仍存在着一定的问题,特别是在较大的发射线圈为较小的接收线圈进行能量传输时,由于接收装置所处无线充电区域位置的差异,常会导致系统的充电效率产生较大波动。为解决这一问题,设计了一种匝间距不等的“非均匀”发射线圈,该设计根据无线能量传输系统的等效电路模型,分析影响系统传输效率的因素,再结合Wheeler公式,推导得出匝间距、线圈自感、互感与系统效率之间的关系。为优化接收设备在无线充电区域不同位置的传输效率,调整发射线圈局部的匝间距使其自感分布相对均匀,进而使耦合线圈的互感相对稳定,在一定程度上提升了系统传输效率及其稳定性。通过仿真和实验验证,在传输距离为10 mm时,接收线圈从中心位置向边缘偏移100 mm的过程中,传输效率的波动保持在17.4%以内,相比于等匝间距的发射线圈,该设计有效提升了系统的抗偏移能力。
As the application scenarios of wireless charging technology become more extensive,the traditional one-to-one charging form of transceiver coils with the same size cannot meet the needs of production and life any more.Wireless charging still has certain problems in some special scenarios,particularly for energy transmitting from larger transmitting coils to smaller receiving coils.Position difference of the receiving device in wireless charging area often result in substantial charging efficiency fluctuations.To address this issue,a“non-uniform”transmitting coil with unequal turn spacing is proposed.Utilizing the equivalent circuit model of wireless energy transmission systems,the influence factors on system transmission efficiency are analyzed;combining the Wheeler formula,the relationships between the system efficiency with turn spacing,coil self-inductance,and mutual inductance are derived,respectively.To optimize the transmission efficiency of the receiving device at different positions in wireless charging area,local turn spacings in the transmitting coils are adjusted to ensure a relatively uniform distribution of self-inductance.Consequently,the mutual inductance of the coupling coil is stabilized,thereby the system transmission efficiency is improved and stabilized to a certain extent.The simulation and experiment show that,at a transmission distance of 10mm,the fluctuation in transmission efficiency remained within 17.4%as the receiving coil shifted 100mm from the center position to the edge.In comparison to a transmitting coil with equal turn spacing,this design effectively improves the offset resistance of the system.
作者
李欣岩
李享
李天龙
杨阳
LI Xin-yan;LI Xiang;LI Tian-long;YANG Yang(College of Electronics and Information Engineering,Sichuan University,Chengdu Sichuan 610065,China)
出处
《真空电子技术》
2024年第2期62-67,共6页
Vacuum Electronics
关键词
无线充电
匝间距
磁场均匀
抗偏移
传输效率
Wireless charging
Turn spacing
Magnetic field uniformity
Offset resistance
Transmission efficiency
