Abstract
In this paper, a hybrid system topology with one-way wireless charging function and the function of the bi-directional data communication is proposed for the problem of electric energy replenishment and data transmission faced by robot fish in the implementation of autonomous submarine cable inspection. Three working modes of the system and the time-sharing multiplexing method are studied. In the power transmission mode, high-efficiency wireless charging is realized by utilizing the transmission characteristics of a series–series (SS)-type resonant network which involves series resonant networks in both the primary side and the secondary side. In the alignment detection and handshake communication mode, the charging platform distance recognition and the handshake signal transmission are implemented through a series–parallel (SP)-type resonant network based on the ASK (amplitude shift keying) modulation method. In the high-speed data transmission mode, the reverse (secondary to primary) high-speed transmission of the inspection data is achieved through a SP-type resonant network based on the OFDM (orthogonal frequency division multiplexing) modulation method. The three modes share the same coupled coils via a reconfigurable resonant network. The working principle of the system is expounded, the system characteristics under each working mode are analyzed, and the time-division multiplexing control strategy is given. The rationality and effectiveness of the scheme are verified by experiments.
Highlights
With the further development of the 21st Century Maritime Silk Road, the marine economy and energy interconnection have become of key interest, which puts higher demands on energy security and power supply reliability
In the submarine cable-inspection system, due to the high salinity seawater environment and the need to deal with two kinds of signals, which are the handshake communication signals between the robot fish and the charging platform, and a large amount of detection data collected by the robot fish, the solutions mentioned in the existing literature cannot meet this special demand regarding energy and data transmission
In the high-speed signal transmission mode, the equivalent circuit of the system is shown in transmission is achieved from robot fish to charging platform based on OFDM [18]
Summary
With the further development of the 21st Century Maritime Silk Road, the marine economy and energy interconnection have become of key interest, which puts higher demands on energy security and power supply reliability. In the submarine cable-inspection system, due to the high salinity seawater environment and the need to deal with two kinds of signals, which are the handshake communication signals between the robot fish and the charging platform, and a large amount of detection data collected by the robot fish, the solutions mentioned in the existing literature cannot meet this special demand regarding energy and data transmission. This paper proposes a wireless energy and data transmission composite topology based on magnetic coupling resonance technology for the problem of wireless charging and data transmission of the submarine cable-inspection robot fish. The time-sharing multiplexing method for energy and signal wireless transmission and its mode switching strategy are proposed, which solves the problem of underwater wireless charging and communication of submarine cable-inspection robot fish
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