Research On The LCC-Type Wireless Power Transmission Via Coupled Magnetic Resonance

In recent years,with the development of our society and the progress of science and technology,wireless power transmission(WPT) has been a very active topic of research.In the three kinds of WPT technology,which based on magnetic resonance coupling with the advantages of medium transmission distance,high efficiency,no radiation,little impact on the surrounds,easy to practicality,has become a hot research topic both at home and abroad.Although there are many relevant research results of WPT via coupled magnetic resonance, it still remains many issues need to be solved.For instance the transmission distance is not far enough,the output of the system will be greatly influenced by the load and the transmission efficiency is still low.As for the magnetic coupling resonance WPT system with LCC(inductance-capacitor-capacitor) composite structure,which has a constant current output,there is few comprehensive research.This paper mainly carries on the detail research on the constant current output characteristics of the LCC-type wireless power transmission via coupled magnetic resonance,which is a important theoretical significance to promote the further popularization and application of the WPT technology via magnetic coupling resonance.Firstly,this paper introduced the wireless power transmission,briefly summarized the application prospect of this technology.Three major wireless power transmission technologies were compared and analyzed,and then summarized the current development situation of magnetic coupling resonance WPT technology at home and abroad.Based on the coupled mode theory and the circuit theory, the inner working principle of the magnetic coupling resonance WPT system was analyzed in detail.Based on the circuit coupled inductance model of the system,a detailed analysis of how the resonant frequency, transmission distance and load influenced the transmission performance of the system was required.Secondly the detailed research of magnetic coupled resonant WPT circuit with LCC was carried out,obtained the input and output characteristics of the circuit,and simulated the system through PSIM.The simulation results showed that when the load changed in a certain range, the output of the circuit could be considered as a constant current source, and the current of the transmitting coil was rarely affected by the load.Finally,this paper designed a experimental circuit of LCC-type WPT circuit via magnetic coupled resonant.And then the corresponding experimental verification was carried out,the experimental results showed that the correctness of the circuit design.