Shan Dongyong, Wang Haiyue, Cao Ke, Zhang Junhua
Postdoctoral Research Station of Clinical Medicine and Department of Oncology Radiotherapy Center, The 3Rd Xiangya Hospital, Central South University, Changsha, 410000, China.
School of Physics and Electronics, Central South University, Changsha, 410083, China.
Sci Rep. 2022 Jan 10;12(1):331. doi: 10.1038/s41598-021-03570-8.
The wireless power transfer (WPT) system has been widely used in various fields such as household appliances, electric vehicle charging and sensor applications. A frequency reconfigurable magnetic resonant coupling wireless power transfer (MRCWPT) system with dynamically enhanced efficiency by using the frequency reconfigurable metamaterial is proposed in this paper. The reconfigurability is achieved by adjusting the capacitance value of the adjustable capacitor connected in the coil of the system. Finite element simulation results have shown that the frequency reconfigurable electromagnetic metamaterial can manipulate the direction of the electromagnetic field of the system due to its abnormal effective permeability. The ultra-thin frequency reconfigurable metamaterial is designed at different working frequencies of 14.1 MHz, 15 MHz, 16.2 MHz, 17.5 MHz, 19.3 MHz, 21.7 MHz and 25 MHz to enhance the magnetic field and power transfer efficiency (PTE) of the system. Frequency reconfigurable mechanism of the system with the frequency reconfigurable metamaterial is derived by the equivalent circuit theory. Finally, further measurement which verifies the simulation by reasonable agreement is carried out. PTE of the system by adding the metamaterial are 59%, 73%, 67%, 66%, 65%, 60% and 58% at different working frequencies. PTE of the system with and without the metamaterial is 72% and 49% at the distance of 120 mm and the frequency of 15 MHz, respectively.
无线电力传输（WPT）系统已广泛应用于家用电器、电动汽车充电和传感器应用等各个领域。本文提出了一种利用频率可重构超材料动态提高效率的频率可重构磁共振耦合无线电力传输（MRCWPT）系统。通过调节系统线圈中连接的可调电容器的电容值来实现可重构性。有限元模拟结果表明，频率可重构电磁超材料由于其异常的有效磁导率，可以操纵系统的电磁场方向。设计了在14.1MHz、15MHz、16.2MHz、17.5MHz、19.3MHz、21.7MHz和25MHz等不同工作频率下的超薄频率可重构超材料，以增强系统的磁场和功率传输效率（PTE）。利用等效电路理论推导了具有频率可重构超材料的系统的频率可重构机制。最后，进行了进一步的测量，通过合理的一致性验证了模拟结果。在不同工作频率下，添加超材料后的系统PTE分别为59%、73%、67%、66%、65%、60%和58%。在距离为120mm、频率为15MHz时，有超材料和无超材料的系统PTE分别为72%和49%。
