Open AccessCross interference suppression methodology by printed circuit board type metamaterial in multi‐frequency multi‐load magnetically coupled resonant wireless power transfer system
Author(s) -
Liu Fuxin,
Ding Ze
Publication year - 2021
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/pel2.12021
Subject(s) - wireless power transfer , metamaterial , inductance , printed circuit board , electronic engineering , power (physics) , interference (communication) , electromagnetic interference , electrical engineering , equivalent circuit , maximum power transfer theorem , electromagnetic coil , computer science , engineering , materials science , physics , optoelectronics , channel (broadcasting) , quantum mechanics , voltage
The prosperity of market in multi‐charging devices has made the researches on multi‐load magnetically coupled resonant (MCR) wireless power transfer (WPT) technique be an urgent issue nowadays. For the sake of load recognition and controllable power distribution, the concept of multi‐frequency excitation was introduced into multi‐load MCR WPT systems. However, the transferred power components at different frequencies inevitably suffer the cross interference at receivers, which negatively affects the accuracy of load recognition and power distribution. To suppress the cross interference, a methodology by using the metamaterial composed of a printed circuit board (PCB) spiral inductor and a lumped capacitor was proposed. The concept of equivalent mutual inductance ( M eq ) was presented to quantitatively describe the influence of metamaterials on the couplings between the transmitting (Tx) and receiving (Rx) coils. By magnetic field simulation, a series of M eq curves versus operating frequency under different metamaterial parameters were plotted and an optimal design was adopted to suppress the power components at non‐targeted frequencies. Moreover, a detailed circuit model was built to characterize the output power of multiple loads after introducing the metamaterial. Finally, the experiments from a prototype was carried out and the experimental results verified the effectiveness of proposed suppression methodology.