Design of Capacitive Wireless Power Transmission System in Seawater

Abstract

As an emerging power supply method, wireless power transmission has attracted extensive attention from researchers at home and abroad. Since there is no direct contact of the wires, it is expected to solve the problem of power supply life of the underwater robot. First of all, this paper combines the working principle of capacitive wireless power transmission, analyzes the working state of the circuit by using the generalized state space average, and obtains the working frequency of realizing the soft switching state. Secondly, two different coupling mechanisms are designed and Maxwell finite element simulation is carried out to calculate the capacitance value and field strength distribution. Finally, the underwater wireless power transmission system is built. The influence of transmission distance d and different coupling mechanisms on output power is discussed. The following conclusions are obtained: (1) As the transmission distance d increases, the output power decreases and the electromagnetic interference increases. (2) Cylindrical capacitors have higher power density and smaller electromagnetic interference than parallel plate capacitors. The research results provide an important reference for future underwater wireless power transmission systems.