Development Of LCL-LCC MC-WPT Constant Current And Constant Voltage System

Wireless Power Transmission(WPT)is also called Contactless Power Transmission.In the absence of electrical contact,Wireless Power Transmission technology can realize the wireless transmission of electrical energy from the energy supply side to the energy receiver.In the end,the t contactless transmission of power energy is realized.At present,in the WPT technology,the development of Magnetic Coupling Inductive Wireless Power Transfer(MC-WPT)technology is relatively mature,and its practical application is extensive.The principle of MC-WPT technology is to achieve longdistance power energy transmission through the same-frequency magnetic field excited by high-frequency AC power.Because MC-WPT technology has the advantages of high transmission efficiency,long transmission distance,etc.,MC-WPT,a new wireless power transmission technology,receives more and more attention.In the MC-WPT system,the constant current on the primary transmitting coil is one of the important conditions for achieving the open-circuit voltage stability on the secondary winding of the system.With MC-WPT system circuit affected by factors such as temperature and environment,the internal resistance circuit device will undergo a series of changes.A safe and stable circuit is the premise of the normal operation of the system,so the constant current on the primary coil and the constant input voltage of the electrical equipment have very important significance to the system circuit and electrical equipment.In the MC-WPT system,closed-loop control is generally used to achieve constant voltage or constant current output of the circuit.A voltage regulator circuit(Buck/Boost)is added to the DC circuit to achieve constant voltage or constant current output through voltage regulation.Adding the voltage regulator circuit in the circuit of the MC-WPT system often increases the complexity of the circuit structure,increases the control difficulty of the system circuit,and increases the cost of the system circuit.In this article the principle of WPT technology,the background,purpose,significance and development status of the article are introduced.The four compensation topologies commonly used in MC-WPT systems are analyzed.The characteristics of the four compensation topologies and the used environment are analyzed.Two kinds of composite compensation topology of LCL and CLC are analyzed.Based on the previous analysis,the LCL-LCC compensation topology MC-WPT system is studied as the research object,to achieve a constant primary coil current and secondary load voltage and to simplify the system circuit structure.In this paper,three modeling methods including generalized average,stroboscopic mapping,and impedance analysis are introduced and a suitable modeling method is used to analyze the primary and secondary circuits.The primary and secondary constant voltages of the LCLLCC circuit are given.The relationship between the voltage gain of the circuit and the capacitance of the secondary side is analyzed,and a parameter configuration method is designed based on this.Based on the analysis of circuit analysis and the configuration of circuit parameters,a set of parameters was designed.In the simulation software Matlab/Simlink platform,a simulation circuit model is set up.When switching the load of the circuit,the constant voltage and constant current effect of the system circuit and the rationality of the parameter configuration are verified.Finally,the hardware circuit platform is set up.Through the hardware circuit experiment,the full text theory deduction and the system constant voltage/constant current effect as well as the system parameter design rationality are verified.