PT Symmetry-Based AUV Dual Transmission Coil Wireless Power Transfer System Design

Abstract

Autonomous underwater vehicles (AUVs) are widely used for ocean exploration; however, the way they are replenished becomes the biggest issue limiting their range and efficiency. A dual transmission coil wireless power transfer (DTCWPT) system based on parity–time (PT) symmetry is proposed in this paper to realize an autoadaptive constant power transmission. A shielded housing structure for coils is equipped to realize WPT in the ocean. In the offset experiments, the proposed dual transmitting coil structure was able to achieve a stable power transmission of 39 W within an offset range of 8.1 cm. It is obvious that the DTCWPT system based on PT symmetry could charge an AUV in the ocean with high robustness. This paper provides a novel solution based on DTCWPT for AUV energy supply. The proposed DTCWPT system could offer remarkable improvements in the navigation performance of AUVs.

A Three-Coil Constant Output Wireless Power Transfer System Based on Parity–Time Symmetry Theory

“…The specific error between the experimental and theoretical data is attributed to various factors: (1) The asymmetric coupling coil design in this study resulted in deviations in coupling coefficients, yet the system retained PT symmetry. (2) The proposed multilayer coil internal resistance can only be controlled to a minimum in practice.…”

“…The proposed system exhibits controllable negative resistance owing to a DC-DC module based on a full bridge inverter, ( , ,1, , ) pq M p q T R p q = = represents the coupling between the coils. The circuit model for a three-coil PT-WPT with an operating angular frequency ω can be established by applying Kirchhoff's voltage law and circuit theory, and is mathematically expressed as follows: (1) Assuming that the distance between the receiving coil R L and the transmitting coil T L is considerably large, the cross-coupling effect is negligible ( 0 TR M = ). Additionally, the internal resistance of the relay coil can be neglected, considering its high-quality factor ( 1 0 r = ).…”

“…With technological development, electricity has become an indispensable part of life. Unlike wired power transmission, in which electrical energy is transmitted through wires or cables, wireless power transfer (WPT) has been widely used in consumer electronics, smart homes, physical robots, and implantable medical devices because of its high flexibility, convenience, and safety, without requiring any physical connections [1][2][3][4].…”