使用磁耦合环隙谐振器的100 MHz中程无线功率传输
Mid-Range Wireless Power Transfer at 100 MHz using Magnetically-Coupled Loop-Gap Resonators
摘要：
我们描述了在100 MHz下工作的高效四线圈感应功率传输（IPT）系统。磁耦合发射器和接收器由电小和高Q环隙谐振器（LGR）制成。与常用的螺旋和螺旋谐振器相比，LGR设计具有明显的优点，即电场被强烈地限制在谐振器的电容间隙内。由于周围空间中的边缘电场可忽略不计，IPT系统不受附近电介质物体的干扰，即使它们非常接近发射器和/或接收器。我们实验与圆柱形和分裂环形LGR几何形状。虽然这两种系统在实验室条件下表现良好，但环形几何形状具有额外的优点，即除了LGR的孔内以及直接在发射器和接收器之间的空间外，磁通量在任何地方都很弱。此外，我们表明，环形LGR系统可以有效地操作在一个固定的频率为广泛的发射机-接收机的距离。实验结果得到了补充的3-D有限元模拟，用于调查的电磁场分布和表面电流密度分布。最后，我们展示了我们的IPT系统的使用功率高达32 W，并讨论了可能的应用。
英文摘要：
We describe efficient four-coil inductive power transfer (IPT) systems that operate at 100 MHz. The magnetically-coupled transmitter and receiver were made from electrically-small and high-Q loop-gap resonators (LGRs). In contrast to the commonly-used helical and spiral resonators, the LGR design has the distinct advantage that electric fields are strongly confined to the capacitive gap of the resonator. With negligible fringing electric fields in the surrounding space, the IPT system is immune to interference from nearby dielectric objects, even when they are in close proximity to the transmitter and/or receiver. We experimented with both cylindrical and split-toroidal LGR geometries. Although both systems performed well under laboratory conditions, the toroidal geometry has the additional advantage that the magnetic flux is weak everywhere except within the bore of the LGR and in the space directly between the transmitter and receiver. Furthermore, we show that the toroidal LGR system can be operated efficiently at a fixed frequency for a wide range of transmitter-receiver distances. The experimental results are complimented by 3-D finite-element simulations which were used to investigate the electromagnetic field profiles and surface current density distributions. Finally, we demonstrate the use of our IPT system at powers up to 32 W and discuss possible applications.
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