Research Of Magnetic Coupling Resonant Wireless Energy Transmission System

Wireless power transmission is a hot topic in the field of new research recently.Compared with the traditional cable power transmission technology,the wireless power transmission technology has the characteristics of reduced size,flexible use and improved safety,etc.At present,there are three kinds of wireless power transmission technologies: electromagnetic wave transmission,inductive coupling transmission and magnetic coupling resonant transmission.Magnetic coupling resonant transmission method compared with the others,has large advantages in the transmission distance,transmission efficiency and security,so this transmission has been the attention of researchers at home and abroad,magnetic coupling resonant wireless power transmission system has a good development prospects.In this paper,the double frequency inverter circuit is applied to the low power magnetic coupling resonant wireless Energy Transmission System,which improves the transmission performance of the wireless transmission system,and compared with the traditional full-bridge inverter circuit.The specific research contents are as follows:(1)Firstly,this article makes an introduction in detail about the working principle,topology and equivalent circuit of the magnetically coupled resonant wireless power transmission system.The distribution of the coupled magnetic field is divided into the near field and the far field by using the theory of electromagnetic field,and the range of the magnetic coupling resonant wireless transmission is distributed in the near field.Using the coupled-mode theory to analysis,it can be concluded that the system can achieve maximum transmission efficiency when the two phase system can achieve maximum transmission efficiency at the same time.(2)Secondly,the transmission characteristics of the magnetically coupled resonant wireless transmission system has been studied in this article.It has analyzed two commonly used resonant topology(string and string structure and serial and parallel structure).The relationshipbetween the transmission power and the transmission efficiency and the transmission distance and the transmission frequency of the two structures are compared by MATLAB simulation software.Using the serial and parallel structure as the resonant topology of magnetically which coupled resonant wireless transmission system.It also makes analysis of the characteristic of resonant coil winding method and the characteristic of resonant coil inside and skin effect.(3)Finally,we designed the hardware circuit device of the magnetically coupled resonant wireless power transmission device.It respectively makes device selection and parameter design of the double frequency inverter circuit and the control circuit and the rectifier circuit and the regulator circuit.It also makes a simulation of double frequency full bridge inverter and traditional full bridge inverterusing by MATLAB simulation software.The comparison shows that the double frequency inverter circuit is better than the traditional full bridge inverter circuit in the magnetic coupling resonant wireless transmission system.And then it makes a low-power magnetic coupling resonant wireless power transmission device for experimental verification.