Research On Electric-field Coupled Wireless Power Transfer System In Oceanic Environment

Wireless Power Transfer(WPT)technology refers to the conversion of energy into other forms of relay through the transmitter.After transmitting a distance,the relay energy is converted into electrical energy through the receiver to achieve non-contact energy.transmission.Electric-field coupling wireless power transfer(ECPT)is an emerging field of wireless energy transmission technology.It has the advantages of low power loss,low electromagnetic interference,and ability to traverse metal obstacles,making ECPT systems become A new direction for wireless energy transmission systems.With the development of autonomous underwater vehicles,AUV's battery life has been a problem,and wireless energy transmission technology is expected to become a key technology to solve this problem.This paper studies the problem of radio energy transmission in the marine environment.The design idea is based on the theory of electric field coupling.The main work has the following aspects:Firstly,the latest research progress of ECPT technology at home and abroad was reviewed.The research status and technical difficulties of underwater radio energy transmission technology were reviewed.The composition and working principle of ECPT system were introduced in detail,and its underwater wireless energy transmission was highlighted.Advantages in the application.Secondly,the coupling mechanism of the ECPT system is designed.Several common coupling mechanisms are introduced.The finite element simulation software is used to study the electric field intensity distribution law,capacitance value calculation and cross-coupling phenomenon,and the energy density and dielectric loss are analyzed.An equivalent model of underwater coupling capacitors is established.Two different coupling mechanisms are designed for underwater applications:flat-plate capacitors and cylindrical capacitors.Finally,a voltage gain model describing the transmission performance is established by using impedance analysis modeling method.The influence of parameters such as quality factor Q,normalized frequency ?,capacitance ratio a and resistance ratio b on voltage gain is analyzed and applied.Experimental verification.The experimental environment of underwater radio energy transmission system is built,and the influence of transmission distance d and different coupling mechanisms on the transmission capacity of ECPT system is studied.Experiments show that the cylindrical coupling capacitor is more suitable for the coupling mechanism in seawater than the flat-type coupler.In the case of similar capacitance values,the output power is higher and the electromagnetic interference is relatively small.