| The magnetically coupled resonant wireless power transmission technology has the advantages of far transmission distance,high transmission efficiency,high transmission power and so on.However,in the design of the actual magnetic resonance wireless power transmission system,there are still shortcomings such as low efficiency of high frequency power source conversion,complex system structure,great loss,poor transmission performance and low overall efficiency.In the current study of wireless transmission topology,CLASS-E~2 topology has the advantages of high conversion efficiency of high frequency power source,simple structure,high transmission efficiency and etc.so this paper focuses on the research of this transmission topology.In the wireless power transmission system,in order to get the working status and performance of the whole system.it need a measurement of plurality of circuit parameters on the front end and back end.for dealing with application which is not convenient to measure parameter on back end and getting less measurements as far as possible,and to achieve the purpose of monitoring the overall state of the wireless energy transmission system,this paper studies the front-end monitoring algorithm based on magnetic resonance wireless power transmission technology.First of all,this paper gives Theoretical derivation of the two coil wireless power transmission model,and analyzes The transmission characteristics of the system by simulation.The transmission coil structure is analyzed theoretically,and the coil modeling and parameter extraction are done by using Maxwell software.The corresponding coil parameters are optimized assisted by Simplorer software simulation.The simulation results show that the optimization of the coil could improve system transmission efficiency.Secondly,this paper studies CLASS-E~2 wireless power transmission structure,which uses the soft switching principle,and the overall transmission efficiency is high,and can design system power according to actual demand.In this paper,from the principle analysis and parameter design of E class power amplifier and E class high frequency rectifier circuit to the general design method of CLASS-E~2 radio power transmission structure,which are described in detail.And the correctness of the method is verified by simulation.In addition,this paper studies a front-end monitoring algorithm applied for magnetically coupled resonant wireless power transmission.The algorithm can be implemented in a series to series wireless power transmission structure,only measuring the voltage and current signal of the front end of the system,the mutual inductance and the load of the system can be deduced,then the output power and conversion efficiency of the system can be deduced.At last,it gets the aim of monitoring the running status of the wireless power transmission system.Which is called : "front-end monitoring";This paper uses simulink to model the algorithm,supplemented by locking demodulation algorithm,and builds a simulation system based on front-end monitoring algorithm.By analyzing simulation system from the frequency,mutual inductance and load of the wireless power transmission system,the correctness and the application scope of the algorithm are verified.Finally,the experimental platform is created to verify the CLASS-E~2 wireless power transmission structure and the front-end monitoring algorithm respectively.The transmission efficiency of CLASS-E~2 wireless transmission system is 63.5%,which is in good agreement with the simulation;The front end monitoring algorithm is experimentally analyzed from the frequency,mutual inductance and load,The experimental results is consistent with simulation results,Which shows that the algorithm has higher accuracy,but not suitable for measurement under large load resistance. |
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