Design Of Wireless Power Transfer Platform Based On Independent Inductive Energy Injection And Free Resonance Topology

Entering the 21st century,the traditional fuel vehicles which used to be equipped with wheels for the world have been unable to meet the current social requirements of green and low carbon due to their high emission and high pollution.Electric vehicles have emerged.With the increasing of electric vehicle production and sales,the problem of cable charging of electric vehicles is gradually exposed,and the high-power wireless charging technology has been paid more and more attention.However,the existing high-power wireless charging scheme is easy to detuning because of the strong coupling between the resonant slot and the converter.Frequency tracking is strict for the zero crossing point of current,and the system parameters(distance between receiving coil and transmitting coil,load impedance)are highly adhesive.In this context,an independent inductive energy injection and free resonance(IIEIFR IPT)is proposed in this paper)The control strategy of wireless power transmission can decouple the resonance network and converter completely,and realize the automatic frequency tracking of the system.It provides a method to solve the frequency tracking and power control for the IPT technology.This paper takes a 6-Tube IIEIFR IPT platform as the research object,and analyzes 10 working modes of the platform in detail.The analytical expressions of primary coil current and primary resonant capacitance voltage are obtained in the case of energy injection mode and free resonance mode respectively.On this basis,the analytical formula of system power is obtained.Furthermore,the DC power supply,the devices involved in topology circuit are designed and selected,and the test prototype of IIEIFR IPT platform is made.The IIEIFR IPT platform is modeled and simulated by SABER software.The trend of main parameters is analyzed.The simulation results confirm the theoretical analysis and the selection of the parameters of the test prototype.Finally,the performance of the prototype is tested.The test results further confirm that the IIEIFR IPT platform can adapt to the change of working point caused by various parameters automatically,and realize the automatic frequency tracking.