Research On Low-voltage And High-power ICPT System Based On Bilateral LCC Compensation

With the increasing energy crisis and issue of environment,the wireless power transfer technology(WPT)has received extensive attention in various fields as a new charging method.Compared with the traditional contact charging,Wireless charging is more flexible,safe,and its charging process is gradually approaching digitization and intelligence,which makes WPT will become the mainstream of modern charging technology.Inductively Coupled Power Transfer(ICPT)has become a research hotspot for domestic and foreign researchers due to its higher transmission power at longer transmission distance.There is a significant progress of technology in the field of ICPT.In order to further improve the transmission efficiency,relevant scholars proposed a double-sided LCC compensation network for ICPT system and conducted in-depth analysis.However,in practical applications,there are some difficulties in system design because the secondary compensation network current of the system is too high,and there is a mutual inductance between the compensation inductor and the energy transmission coil.Based on the previous research,this paper proposes a new type of double-sided LCC compensation network for those problems.The main contents of the paper as follows:The system transmission power,the branch current equation,and the compensation component parameters can be derived through theoretical derivation.We also propose a method by properly adjusting the series compensation capacitors to make primary inverter circuit of the ICPT system works in zero voltage switching(ZVS)state;Based on the electromagnetic field,the coupling mechanism model was established and analyzed.The influence of the displacement of the coupling mechanism in different directions on the selfinductance,mutual inductance and coupling coefficient of the coil was studied.The simulation results are validated through the experimental prototype;The equivalent circuit model of the system is established in this paper.The transmission characteristics of ICPT system with the typical double-sided LCC compensation network and ICPT system with the new double-sided LCC compensated network are compared and analyzed.The simulation results verify the correctness of the theoretical analysis;Based on the above,the experiment on 3.3KW prototype was designed.And we have got the energy transmission characteristics of experimental prototypes under different output voltages.The experimental results are almost the same as the theoretical analysis,which verifies the feasibility and correctness of the proposed scheme.