Efficiency Analysis and Experimental Research on Wireless Power Transmission Based on Magnetic Resonant Coupling

The technology of wireless power transmission in middle distance is studied based on resonant coupling,and a wireless power transfer model is established.The theoretical derivation of the received power and the transmission efficiency is conducted.The relations among the maximum transmission efficiency,transmission distance and load resistance value are researched when transmitting and receiving circuit is working in resonance coupling state.The comparative tests are carried out with many coils of different parameters to explore factors which impact the result of wireless power transmission,the relationship between the transmission distance and the transmission efficiency is verified.The factors which affect the output voltage are studied such as frequency,transmission distance,the radius of the coil,the coil turns and the load resistance value,and the relationship of power transfer between different diameter coils is also explored.