Dual Resonant Frequency Inductive Power Transfer in an Underwater Tight Coupling System

Abstract

The application of wireless power transfer technology in the underwater environment proposes both opportunities and challenges to undersea power feeding. Due to the attenuation of electromagnetic waves in seawater, the distance between transmitter and receiver is always maintained at a minimum value, which results in tight coupling between the transmitter and receiver. The tight coupling condition provides a low impedance loop for high-order harmonic, so the component of the harmonic wave is thus significantly increased and cannot be ignored in the power transmission system. In order to fully utilize the harmonic energy, a fundamental-harmonic dual-channel system was proposed and studied in this paper. Compared with single-channel systems transmitting fundamental wave only, the dual-channel system has higher power transmission capability, while the loss in dual channel system can be less than that of a single-channel system after proper optimization. A 3 kW experiment platform is established to verify the effectiveness of theoretical analysis.

Review of low‐loss wireless power transfer methods for autonomous underwater vehicles

“…This technology was first used in air medium, wireless charging pile position of electric vehicles in transportation field [23,24], pocket wireless charger of the miniature electronic pacemaker in the medical field [25,26], and wireless transmission of industrial field and smart homes [27,28]; however it has gradually been extended to seawater medium owing to advancement and high demand for this technology [29,30]. Due to the particular complexity of seawater environment, wireless power transfer is faced with serious electromagnetic wave attenuation [31,32], irregular disturbance of seawater ocean current, difficult docking of charging equipment and other problems [33,34], and its efficient transmission has not been fundamentally solved [35][36][37][38][39].…”

Application of NSGA-II to Obtain the Charging Current-Time Tradeoff Curve in Battery Based Underwater Wireless Sensor Nodes

“…In summary, the minimization of the required power from the energy source point of view is reached in the literature indirectly through the maximization of the energy transmission efficiency [ 19 ]. In addition, some other authors reduce the antenna parasitic resistances and minimize the generator equivalent impedance [ 20 ].…”