| Traditional underwater navigation equipment adopts power supply methods such as wet-pluggable waterproof connectors and replacement of energy storage devices.Underwater Wireless Power Transfer(UWPT)has become a new type with its advantages of non-contact energy transmission,high safety and reliability,and strong concealment.A new type of single-side phase-shifting output voltage regulation method is proposed based on the modeling analysis and exploration experiment of underwater magnetic coupling resonance wireless power transfer technology.It can be used for synchronous rectification and wide-range output voltage regulation to avoid the interference of the seawater electromagnetic environment on the communication between the transmitter and receiver of the traditional voltage regulation method,and improve the response speed and transmission efficiency.This voltage regulation method is applied and improved to the problem of multi-load output voltage regulation at the same time to solve the problem that the traditional primary side frequency modulation or phase-shift control method can only regulate the output voltage of one load.In view of the influence of the eddy current loss in the UWPT system on the system modeling,according to the Helmholtz equation,the electric field strength in the coupled coil area is derived based on the coupled mode theory and mutual inductance circuit theoretical modeling analysis in the air medium.Furthermore,the electric field strength of the coil area is used to analyze the impedance change of the coupling coil in the seawater medium,and the eddy current loss is reflected as the resistance component in the two-port network of the coil.Finally,a coupled coil impedance model that takes into account the resonant frequency and seawater conductivity and the equivalent circuit of the T-type system including Z parameters are obtained,which provides a theoretical basis for the functional design of the voltage regulating circuit.The resonance network of the UWPT system is compared and selected,and the LC-LC series resonance analysis is completed.Ansoft Maxwell and Simplorer software are used to simulate the transient field and eddy current field of wireless power transmission in land and seawater environment to explore the influence of eddy current loss on transmission performance and the phenomenon of primary side detuning.A 3D printed water tank is used to simulate the seawater environment.Through frequency value and salinity value experiments,the operating frequency,salinity value,transmission distance and power of the prototype are determined,the detuning phenomenon in the simulation is verified.A new phase shift control method based on Semi-Bridgeless Active Rectifier(S-BAR)is proposed.The inductive equivalent load is determined to be adopted to achieve ZVS based on working modal analysis and equivalent load impedance control principle analysis.In Saber,the new phase shift control model of S-BAR is used for analog circuit design and open-closed loop simulation.UCD3138 digital power controller is used to build a hardware experimental circuit to verify the rationality of its phase shift output voltage regulation and the stability of the closed loop when the input is disturbed and the load is cut.The principle of power distribution and voltage regulation is analyzed for the multi-load UWPT system based on the new S-BAR single-side phase shift control.The power supply voltage and the circuit inductance are increased to meet the required power distribution and phase shift range according to the two-way load simulation experiment,.Two different PID parameters are set,and one fast dynamic response closed loop is given priority to alleviate the power competition relationship of simultaneous load cutting.UCD3138 digital power controller is used to build a hardware experimental circuit,and two closed-loop experiments of simultaneous load-cutting are completed to verify the correctness of the analysis method. |
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