A Comparative Study Between Novel and Conventional Four-Resonator Coil Structures in Wireless Power Transfer

作者：Huang, Shoudao; Li, Zhongqi^*; Li, Yong; Yuan, Xiaofang; Cheng, Shuangying

来源：IEEE Transactions on Magnetics, 2014, 50(11): 8401704.

DOI：10.1109/TMAG.2014.2331962

• Coupled magnetic resonances
• coupled-model theory (CMT)
• novel four-resonator coil structure
• wireless power transfer (WPT)

Magnetic resonant wireless power transfer is an emerging technology that may create new applications for wireless power charging. However, for general deployment, low efficiency is a main obstructing factor. In this paper, a novel four-resonator coil structure is presented to improve system efficiency. Compared with the conventional four-resonator coil structure, its source and load coils are designed to have high loaded-Q (quality factor) and maximum cross coupling coefficients. Therefore, the source and load coils participate in the coupled-resonance with opposite-side resonators. And additional energy exchange paths are provided. To prevent frequency splitting and to obtain optimum efficiency, a method of coordinating the load resistor and operating frequency is proposed. The theoretical analysis and experimental results demonstrated that the proposed coil structure and method can increase system efficiency effectively.

• 出版日期2014-11
• 单位湖南大学