毕业翻译无线输能技术基于磁共振的中距离无线能量中继传输.doc

原文 Midrange Wireless Energy Transfer System with Relay via Magnetic Resonance Dai Xuguang Yu Kai Chen Qian Tan Chong Zhou Zhigang Bu Zhiyong （Shanghai Institute of Microsystem and Information Technology of ChineseAcademy of Science Shanghai 200050 China） Abstract Wireless energy transfer by coupled magnetic resonances is a popular technologywhich energy can be transferred via coupled magnetic resonances in the non-radiative near-field. Thispaper proposes a four coils magnetic resonance system with relay. Based on circuit analysis and simulation, we designed and optimized circuit parameter of the system to make the system worked at magnetic resonance. Experimental results show that with relay the end-end efficiency is 33.4%, while the end-end efficiency is just 22.1% without relay. With relay the end-end efficiency can increase 11.3% comparing with the efficiency without relay; the maximum transfer distance can increase about twice of coil diameter comparing with the distance without relay. Experimental results indicate that relay can increase the end-end system efficiency and the transfer distance of a magnetic resonance system. Keywords: Wireless energy transfer, magnetic resonance, energy relay, efficiency 1 Introduction With the rapid development of mobile devicessuch as mobile phone and tablet computer, there has been an increasing interest in wireless power-transfer technology. Specially, significant progress has been made for inductively coupled systems [1-3] . Also inductively coupled power-transfer systems have been widely used, including vehicle battery-charging systems, and very high end-to-end system efficiency of up to 80% has been documented [1] , However, most studies have been restricted to close range(i.e., typically shorter than 30% of the coil diameter.) The transmission distance is generally close to 1cm [1] and 15cm is considered a fairly large distance [3] . Results at midrange (i.e., more than twice the coil diameter) rarely been reported. One