Study Of Magnetic Coupled Resonant Wireless Power Transmission System Based On Class-E Inverter

Compared with the traditional magnetic coupling inductive radio energy transmission technology,the magnetic coupling resonant radio energy transmission technology overcomes the defect that the electric energy can only be transmitted at a short distance,and achieves high efficiency transmission of electric energy in a medium distance.The reason is due to two improvements: one is to add two resonant coils with higher quality factor in the system,and the other is to greatly increase the frequency of the system.The improvement of these two aspects also makes the transmission characteristics of the magnetically coupled resonant radio energy system more complicated,and the performance of the system is difficult to control.In view of the efficiency optimization of magnetically coupled resonant radio energy technology,this paper has done the following two researches:1.Modeling and analyzing the system.In order to analyze the characteristics of the magnetically coupled resonant radio energy transmission system,this paper constructs a magnetically coupled resonant radio energy transmission system model using the physical modeling method of mutual inductance theory.In the mutual inductance model,the physical parameters of the magnetically coupled resonant radio energy transmission system are abstracted into electrical parameters such as frequency,inductance,capacitance,internal resistance,coupling coefficient and load.The optimization of the system is also the correction of these electrical parameters;Establish the connection between the independent parts of the system,use Kirchhoff's voltage law and mutual inductance theory to quantitatively describe the electrical state of each independent circuit,and obtain the output power and transmission efficiency of the system,and optimize the system.Provide theoretical basis and optimization methods.2.High frequency class E inverter soft switch design.The system frequency level is an important factor restricting the transmission efficiency of the magnetic coupling resonant radio energy transmission system,and the class E power amplifier itself is easy to implement high frequency and high efficiency inverter,which is very suitable for the power supply of the magnetic coupling resonant radio energy transmission system..In order to reasonably design the parameters of the E-type inverter to reduce the switching loss and increase the inverter frequency,the optimal operating state of the E-type inverter is taken as the optimization target,and the relationship between the main parameters is obtained.The output power of the class E inverter at its rated optimum operating state is obtained.Based on the above two researches,this paper makes the following innovative contributions to the magnetically coupled resonant radio energy transmission system:During the research of class E inverters,it is found that the rated optimal working state is closely related to the input impedance of the system,in addition to its own parameters,so when the class E inverter acts as a magnetically coupled resonant wireless energy transmission system.When the power is supplied,its parameters should be designed in close conjunction with the entire system.This paper proposes a high-efficiency class E inverter power supply design method for magnetic coupling resonance system,which uses the mutual inductance theory model to obtain the input impedance of the system,and the whole system is equivalent to the class E inverter;further Taking the rated working condition of the class E inverter as the optimization goal,the main parameters are designed to realize the overall optimization of the efficiency of the magnetic coupling resonant radio energy transmission system and the efficiency of the class E inverter power supply.