脉冲方波激励下的无线电能传输仿真与实验

Field-circuit coupled simulation and experiment for wireless power transmission excited by square wave

磁谐振式无线电能传输技术是基于谐振耦合现象利用近区磁场进行非辐射性、中距离输电的新技术。自MIT发表基于磁谐振的无线电能传输实验论文以来,各国学者相继进行了大量研究。许多结果都基于正弦交变电流作激励,以此分析计算线圈的耦合特性,计算耦合电压和功率。脉冲电流也可以产生交变磁场,脉冲激励下的无线电能传输有其自身的特性。本文分析了脉冲激励下的电路响应过程及谐振耦合机理,其耦合过程也是一种正弦波耦合,由场路耦合仿真分析和实验验证可知,与正弦激励相比,用脉冲方波作激励负载可获得较大的传输电压,此方式也可实现有效的无线电能传输。

Magnetic resonant wireless power transmission is a new type of technology which conducts non-radiative,mid-range power transmission based on resonant coupling phenomena. The scholars from different countries have conducted numerous similar experiments and analyses. With the sinusoidal alternating current being the exciting source,many results were achieved through simulating and analyzing coil coupling using the alternating magneticfields generated by the alternating current and then calculating the coupling voltage and power. The pulse current can also produce alternating magnetic fields and the wireless power transmission excited by the pulse current has its own features. With this transmission method,higher power can be transmitted to the load. In this study,the circuit response process and the mechanism of resonant coupling excited by the pulse current are discussed,and the corresponding simulations and experiments are conducted.