Research On The Technology Of Low Power Wireless Power Transfer Via Strongly Coupled Magnetic Resonances

Wireless power transfer via strongly coupled magnetic resonances has obvious advantages such as long distance of power transfer,high transfer efficiency,and large power transfer.In recent years,it has become a hot subject for various universities and enterprises,and has also been widely used in industrial applications and people's daily lives.At present,wireless power transfer via strongly coupled magnetic resonances has been widely applied in new energy vehicles,portable equipment and other fields.It shows the progressiveness of the technology.However,as a new technology of wireless power transfer there are many places that need to be further studied and improved.In this paper,the working principle of wireless power transfer via strongly coupled magnetic resonances is briefly introduced and analyzed,and modeled for four topology structures from a mathematical point of view and analyzed for their power transfer characteristics.Then the wireless power transfer experiment platform via strongly coupled magnetic resonances was independently designed.Through the experiment platform,designed related experiments and verified the correctness of the theoretical analysis in the previous.Finally,completed wireless power transfer by constant voltage.Specific researches are as follows:Firstly: The RLC series circuits and RLC parallel circuits are analyzed.Then mathematical modeled and quantitative analysed for the four topology structures of SS,SP,PS,and PP.Quantitative analysis of the relationship between power transfer efficiency,power transfer power and system working frequency,power transfer distance,load resistance for SS and PS topology structure.It is concluded that the topology structure can achieve greater power transfer power and higher power transfer efficiency under the same conditions.Finally,analyzed some factors that affect the efficiency of power transmission in the system from the components switching loss,physical characteristics and introduced the phase shift control strategy and PI controller design for wireless power transfer experiment platform.Secondly: Based on the mathematical model and analysis of the SS topology structure in the previous,a wireless power transfer experiment platform via strongly coupled magnetic resonances was designed from two parts of hardware and software.The experiment platform not only can wireless power transfer,but also can Real-time acquire the transmitter and receiver voltage and current data and feedback the data to the computer via wireless module and serial portThirdly: Using the experimental platform designed in this paper,making experiments for the influence of system working frequency,power transfer distance and load resistance on the transfer power and efficiency.Verify the correctness of the theoretical analysis in the previous article.Then,combining the analysis of transfer characteristics analysis and system loss,contrasted the system transfer power and efficiency in the experiments.Summarize the power loss of the experimental platform.Finally,selected the appropriate power transmission distance and load to achieve system power constant voltage transfer experiment at the system resonant frequency.