Research On Four Coil Magnetically-coupled Resonant Wireless Power Transfer System

In recent years,wireless power transfer(WPT)technology as a new power transmission system,compared with the traditional contact-type electric energy transmission,which can avoid the harm caused by damage of wires and ensure the safety of power supply.Magnetically-coupled resonant wireless power transfer(MCR-WPT)technology has a long transmission distance,high transfer efficiency.This technology is used in portable devices such as mouse,mobile phone,remote control,and so on.It has reduced the use of batteries and protected the environment.As a very promising way of wireless power transfer,the technology of magnetically-coupled resonant wireless power transfer is of great value in research and application.The main research of this paper is as follows:1.This paper describes the characteristics and domestic and foreign research status of the three types of wireless power transfer technology,and makes a brief comparison of their advantages and disadvantages as well as the applicable occasions.Then,this paper introduces the structural features and energy transfer mechanism of four coil magnetically coupled resonant wireless power transfer system,and then a detailed analysis of the system coupling coil inductance,high frequency capacitance and high frequency parasitic resistance characteristic.2.Capacitance compensation topology analysis and selection of the four coil magnetically-coupled resonant wireless power transmission system,established a network model and the two port model of the system,on the basis of the modle,the calculation formula of the power and efficiency of the system is derived.Then the power characteristics and efficiency characteristics of the system are analyzed in detail,In order to analyze the compensation capacitor impact on system power characteristics and realize power optimization.The switching control capacitor structure is introduced,the characteristics and working principle of the structure are analyzed,and the feasibility of the application of the structure in the four coil magnetically coupled resonant wireless power transfer system is analyzed on the basis of the mathematical model.3.The simulation model of the four coil magnetically-coupled resonant wireless power transfer system with switching control capacitor structure is established and the corresponding experimental device is built.The simulation waveforms and experimental waveforms are analyzed,the stability of the system and the feasibility of the application of the switched capacitor structure in the system are verified.Finally,the switch control capacitor structureis used to analyze the relationship between output power and transmission efficiency and transmission distance and compensation topology.Verifing the theoretical analysis of the transmission characteristics of the system,as well as the role of switch control capacitor structure in optimizing the transmission power of the system.4.A wireless transmitting mouse based on four coil magnetically coupled resonant wireless power transmfer technology is designed.The drive signal occur circuit,drive circuit,inverter circuit,high-frequency coupling coil,rectifier filter circuit and voltage stabilizing circuit of wireless charging mouse system is analyzed and designed.The working state of the system is studied experimentally,and the feasibility of the application of the four coil magnetically coupled resonant wireless power transmission system in wireless transmitting mouse is verified.