Primary Control Wireless Power Transmission System Research

In recent years,wireless power transmission has a rapid development.Accompanied by this,in some special occasions,such as underwater robots,implantable medical electronics,etc.,often need to provide more space for the use of sensors to reduce the power supply part of the circuit occupied by the volume.Therefore,it is necessary to propose a solution of wireless power transmission technology,in the system of the primary control,secondary structure as simple as possible,the system can be based on changes in load to achieve closed-loop control.In this paper,the four topologies of SS,SP,LCLS and LCLP are analyzed,and the four proposed structure feasibility primary control can be achieved.Then,we focus on the derivation of the structure of LCLP.It is described in detail that in the case of coil self-inductance,system frequency and other parameters fixed,the load,the load voltage and system mutual inductance can be identified by measuring the voltage across the resonant capacitor at the transmitter,the current in the transmitting coil and the difference between the two phases,and then closed-loop control,to control the load at both ends of the output voltage constant purpose.And the influence of the load and the mutual inductance on the power of the system is analyzed.Using Simulink for system simulation,mainly studies under the change of the load value or mutual inductance value,can achieve constant voltage output.Experiments show that the system can realize the identification of the mutual inductance value,the load value and the voltage across the load,and the system can realize the closed-loop constant voltage output when the load changes within a certain range.Then the Maxwell magnetic simulation is carried out on the coupling mechanism of the system,the vertical displacement and horizontal displacement range that the system can tolerate are analyzed.Then set up the system hardware experimental platform,due to lack of time,achieved the system load value and the voltage across the load identification.The recognition effect is good and the error is within the acceptable range.The experiment can verify that the system parameters can be identified under open loop conditions.