Premium
Operating characteristics of four‐coil magnetic resonant coupling wireless power transfer under different resonant states
Author(s) -
Wang Meng,
Wang Haoran,
Zhang Yiming,
Shi Yanyan,
Yang Lan
Publication year - 2021
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2850
Subject(s) - wireless power transfer , coupling coefficient of resonators , resonant inductive coupling , coupling (piping) , electromagnetic coil , inductive coupling , maximum power transfer theorem , capacitance , power (physics) , power transmission , electrical engineering , transfer (computing) , transmission (telecommunications) , materials science , physics , electronic engineering , engineering , energy transfer , atomic physics , computer science , resonator , thermodynamics , electrode , quantum mechanics , parallel computing , metallurgy
Summary In wireless power transfer, the transfer efficiency decreases with the increase of the transfer distance. To improve the power transfer performance, the operating characteristics of a conformal coplanar four‐coil magnetic resonant coupling wireless power transfer system are investigated and analyzed under four different resonant states. Based on the complete equivalent circuit model, the transmission coefficient and the input impendence are calculated. The performance of the systems operated under four resonant states is studied and compared. Also, the origin of the difference is specifically analyzed. The simulation results indicate that the wireless power transfer system operated under State 1, the state where the compensated serial capacitance makes the coils work at the frequency of the maximum Q ‐factor, shows the most excellent transfer characteristic among the four resonant states. The transmission coefficient can be well maintained above 0.8 within the transfer distance of 30 cm. Experiment has been carried out for validation, and the result indicates that more power can be delivered to the load for the system operated under State 1.