Research On The Wireless Power Transmission Network Based On Novel Dumbbell-shaped Coil

Wireless Power Transfer(WPT)technology is safe,simple,and convenient.This technology can be applied in consumer electronics,medical,transportation and other fields,and has unparalleled advantages over wired power transmission.Wireless Power Transfer methods include electromagnetic induction,magnetic coupling resonance,and radiation.In the current application of wireless energy transmission,the electromagnetic induction and magnetic coupling resonance are the most widely used for many fields.The electromagnetic induction type has the advantage of high transmission efficiency,but its short transmission distance and the ability to supply energy to a single load,which are also constraint for this technology.Compared with the electromagnetic induction type,the magnetic coupling resonance type will increase the distance from a few centimeters to several meters,and it can provide energy for multiple loads.Therefore,the using magnetic coupling resonant wireless energy transfer has broad research prospects.This paper is based on a novel dumbbell-type coil used in long-distance relay,network structure of magnetic coupling resonant WPT system.The main research directions include the following aspects.(1)Analyzing the WPT technology research method based on the circuit theory: it mainly analyzes the transmission efficiency,transmission power of the multi-resonator system,load isolation of the system,and the influence of frequency splitting caused by cross coupling between non adjacent resonators in multiple resonators on the system is discussed.(2)The dumbbell type coil model is introduced,and the mutual inductance of the coil and the cross coupling between the non adjacent coils can be suppressed in the multi-resonant system,and the direct coupling between the adjacent coils is increased,and several ways of calculating the self inductance and mutual inductance of the coils are introduced.(3)The long distance Domino WPT system is built by the dumbbell type coil,and the system is simulated and verified by the dumbbell type coil to solve the influence of the frequency drift caused by the cross coupling between the non adjacent resonators.(4)Using the characteristics of the Domino WPT system can suppress cross coupling and long distance transmission,combined with the transmission characteristics of the multi load of the network structure,the high efficiency Domino network radio energy system is formed,and its performance is verified experimentally.