Research On Coil Design And Topology And Control Of Wireless Charging System For AUV

The ocean is the treasure of human beings.In the exploration of the ocean,autonomous underwater vehicle(AUV)has been paid more and more attention.In order to omit the salvage procedure before the vehicle`s charging,improving the safety and expanding the cruise range of the vehicle,the underwater wireless power transfer technology of the AUV arises.Wireless power transfer technology can realize the power transmission in the case of non-direct contact,possessing the ability to realize direct underwater charging of AUV.In this paper,the coil design,compensation topology,and control strategy of autonomous underwater vehicle wireless charging system are studied through theoretical derivation,simulation and experimental verification.This paper mainly studies the following contents1.Firstly,the basic composition and implementation of the underwater wireless charging system are introduced,including the construction of experimental platform for wireless charging system and preliminary experiments.This part analyzes the difference between underwater wireless charging and wireless charging in the air,and focuses on the influence of underwater eddy current loss in the charging process.After the theoretical analysis of underwater eddy current loss,through the experiment about underwater eddy current loss,the basic conditions suitable for underwater wireless charging are analyzed,which lays the foundation for the research and design in the later research.2.The advantages and disadvantages of the existing coil design are summarized,then this part designs a new type of vehicle wireless charging coil.The new designed coil can make the coupling magnetic field of the transmitting coil and receiving coil in AUV during wireless charging process as little as possible,minimizing the impact on the internal electronic devices of the vehicle,when the vehicle occurs any offset rotation,the mutual inductance between the transmitting coil and the receiving coil can be maintained basically.3.By analyzing the characteristics of the existing topology,combined with the specific requirements of underwater wireless charging,the compensation topology suitable for underwater vehicle wireless charging is studied.Firstly,two topologies are used to realize the compensation,including LCC-S topology and LCC-N topology.After the theoretical derivation is verified by simulation,the transmission efficiency difference between the two topologies is further verified by experiments,and the application scope of the two topologies is analyzed.4.Based on LCC-S compensation topology,the control strategy suitable for underwater vehicle wireless charging is studied.The rectifier bridge at the transmitting part and receiving part of the wireless charging system are selected to be controlled,and the power factor correction(PFC)and constant voltage output at both ends are realized.The passivity-based control(PBC)is selected as the control method,and the passivity-based control energy equations of the transmitter and the receiver are derived.A control law suitable for underwater wireless charging is designed.The feasibility of the control is verified by simulation and experiment.