Study On Multi-coil Wireless Power Transfer With Anti-misalignment And Anti-deflection

Inductive power transfer(IPT)technology uses high-frequency magnetic field as an energy transmission medium,and comprehensively utilizes power electronics technology,resonant topology and control technology to achieve non-contact transmission of electrical energy.Compared with traditional power transmission methods,this technology has the advantages of strong environmental adaptability,high flexibility,convenience,safety,and beauty,and has broad application prospects in the fields of electric vehicles and smart homes.However,in the practical application of the IPT system,it is necessary to precisely align the transmitting mechanism and the receiving mechanism.If there is a misalignment in one or more directions between the transmitting mechanism and the receiving mechanism,the coupling coefficient will decrease and the transmission energy efficiency will decrease.Therefore,improving the flexibility of the receiving mechanism to pick up the electrical energy is the key problem that needs to be solved urgently in the practical application of the IPT system.In order to improve the anti-offset and deflection performance of the IPT system,this paper constructs a "dual-transmit-dual-receive" IPT system based on the double-layer orthogonal DD magnetic coupling mechanism.At the same time,in order to realize constant voltage output and soft switching,the system adopts dual-channel LCC-S compensation circuit,and builds a 500 W prototype device for verification,the main research work of this paper is as follows.Firstly,the basic composition and working principle of the IPT system are introduced,the equivalent circuit model of the mutual inductance of the magnetic coupling mechanism is established,and the output characteristics,advantages and disadvantages of different compensation topologies are analyzed and compared in detail.In addition,since the magnetic coupling mechanism has single energy channel and multi energy channel energy transfer forms,in order to evaluate the anti-offset performance of different magnetic coupling mechanisms,the equivalent coupling of the multi energy channel energy transfer magnetic coupling mechanism is deduced based on the single energy channel.coefficient,which lays a foundation for the design optimization of the magnetic coupling mechanism and the comparison of the anti-offset performance of different magnetic coupling mechanisms.Secondly,in view of the decrease of coupling coefficient and transmission energy efficiency caused by the dislocation of the magnetic coupling mechanism,this paper proposes an IPT system based on a double-layer orthogonal DD magnetic coupling mechanism.The two pairs of DD coils constituting the double-layer orthogonal DD coil are easy to Decoupling,by optimizing the amplitude and phase difference of the two excitation currents,the synthetic magnetic field is periodically rotated and distributed.This feature is the inherent reason for the anti-offset and anti-deflection performance of the "dual-transmitdual-receiver" IPT system.In the process of designing and optimizing the magnetic coupling mechanism,the spatial position of the double-layer orthogonal DD coil and the interaction law between the characteristic parameters of the magnetic permeability mechanism and the coupling coefficient are given,and the horizontal offset,vertical offset and vertical offset are analyzed.The variation law of coil mutual inductance in three cases of deflection.At the same time,an LCC-S resonant circuit structure based on dual inverter-dual rectifier is constructed,and the parameter configuration conditions of the resonant element in the case of forward and offset deflection are given to realize the constant excitation current of the transmitter coil and the system The output voltage is not affected by the load.Finally,a 500 W experimental prototype with a transmission distance of 130 mm was built to verify the anti-misalignment and anti-deflection performance of the "dual-transmitdual-receive" IPT system.Within the range of 90°,the coupling coefficient retention rate of the prototypes is not less than 40%,and the system transmission efficiency is not less than 80%.