Design Of Multi-Coil Wireless Energy Transmission Circuit Based On Magnetic Resonance

Wireless energy transmission refers to the transmission of energy through electromagnetic means rather than wires.It is a technical field that is currently attracting attention and has a wide range of application needs in various fields such as medicine,military,and life.Wireless energy transmission technology can generally be divided into two kinds:Near field magnetic coupling technology and far field transmission technology.For the latter,high frequency electromagnetic energy is transmitted by the transmitting antenna in a certain direction,and the receiving antenna receives energy and provides it to the load.The advantage of this technology is its long transmission distance.The disadvantages are high prices and radiation safety issues.For near-field magnetic coupling technology,the transmitter and receiver operate in the near-field range and transmit electromagnetic energy through mutual coupling.The transmitter and receiver usually resonate at the same frequency to achieve higher transmission efficiency.Near-field magnetic resonance technology has the advantages of low price and easy implementation.The disadvantage is that the transmission distance is short.This paper uses the magnetic resonance method in the near field coupling technology to achieve wireless energy transmission of multiple coils.The multi-coil wireless energy transmission studied in this paper requires that the energy of multiple transmit coils be used for the load of the receive coil with the highest efficiency,which involves beamforming.In actual life,wireless energy transmission technology is usually used to implement wireless charging.In wireless charging,the charging device does not always maintain the same state,so it is necessary to construct a transmission circuit that can be adjusted in real time.In this paper,the main work are as follows:1)The basic principle of the wireless energy transmission system is analyzed and the determinant factors of wireless power transfer are studied.The key factors affecting the transmission efficiency of the system are obtained from it;2)The principle of wireless energy transmission was studied and discussed separately from the following cases:SISO(single-input single-output)system and SIDO(single-input double-output)system without a drive coil;SISO system and SIDO system wireless energy transmission circuit with a drive coil.Obtained the conditions for the highest energy transmission efficiency and provided a theoretical basis for system construction;3)A method for implementing an energy distribution scheme in a wireless energy transmission system is provided.The system mainly includes:gain adjustment module,amplitude and phase detection module,amplitude and phase setting module and other auxiliary circuits.The selection basis of each module element is introduced,and how to use the SCM and related integrated chip to realize the real-time adjustment of the transmission coil energy distribution scheme in the wireless energy transmission system;4)The establishment of wireless energy transmission experiment demonstration system was introduced.SISO system and SIDO system are constructed.The relationship between energy transmission efficiency and distance is studied.A real-time control wireless energy transmission circuit is actually built,measurement and confirmation of the practicality of each module is performed,and a microcontroller is prepared.The program implements real-time adjustment of the energy distribution scheme.This paper studies the real-time regulation of wireless energy transmission systems.The wireless energy transmission system has been studied in depth,and a test platform is built.The research shows that the wireless energy transmission system can realize the real-time regulation of energy distribution and make the system work under the highest transmission efficiency.