Research On Simultaneous Wireless Power And Data Transfer Technology In Shared Channels

The magnetic coupling wireless power transfer technology,with its advantages of non-physical contact,good scalability,and low electromagnetic radiation,has been widely applied in fields such as electric vehicles,household appliances,and biomedical healthcare.In the actual system,in addition to completing the power transfer,it is generally necessary to realize the data communication to meet the information exchange requirements of the power supply side and the load side.The method of using separate channel technology to realize simultaneous wireless power and data transfer is relatively mature and easy to implement,but signal transmission is vulnerable to power transmission interference and the system is complex.The proposed shared channel simultaneous wireless power and data transfer technology can solve these problems,so this paper will conduct research on it.Firstly,the basic composition and working principle of magnetic coupling wireless power transfer system are analyzed,the implementation principle and structural characteristics of various shared channel simultaneous wireless power and data transfer methods are compared and studied,and the influence of power circuit compensation network on carrier communication is analyzed.Based on the above theoretical research and comparative analysis,the simultaneous wireless power and data transfer method based on the parasitic capacitance and bilateral LC reactive power compensation network are determined.Secondly,a bilateral LC parasitic capacitive simultaneous wireless power and data transfer topology is designed,which can achieve simultaneous wireless power and data transfer without significantly increasing the system complexity,changing the power circuit structure and affecting the power transmission process.Based on the superposition theorem and the AC impedance method,the mathematical modeling and impedance analysis of its circuit topology are carried out,and the main parameters of the system are determined by combining the actual measurement values of the coupling mechanism and experimental conditions.The interference effect between the power transmission and signal transmission is analyzed and a quantification formula is derived,which lays a theoretical foundation for the system design.Then,the modulation and demodulation strategies of the data signal are compared and analyzed,and the On Off Keying modulation and demodulation method is selected,and the hardware structure design of this method is completed.Finally,the simulation and experimental verification of the proposed bilateral LC parasitic capacitive simultaneous wireless power and data transfer system are carried out.A circuit model of the system is built using simulation software,and the simulation results verifies the effectiveness of the system’s functions.Then,according to theoretical research and simulation analysis,a hardware experimental platform is built.The experimental results show that the circuit structure designed in this paper can achieve simultaneous wireless power and data transfer,with the advantages of less mutual interference between power and signal,shorter communication handshake time,and lower system complexity.