The power loss analysis for resonant wireless power transfer

Printed Circuit Board Coils of Multitrack Litz Structure for 3.3-kW Inductive Power Transfer System

“…On the other hand, the Fig. 12(b) presents the experimental and simulation results of total and coils efficiencies, as were defined in (24) and (25), respectively. The coils efficiency is η coils = 93% and the total efficiency is around η total = 88% for an output power of P out = 3.3 kW.…”

“…Many improvements have been developed through research in loss estimation, [23], [24], [25], optimization of shape and size of the transmitter and receiver coils, [26], [27], testing of different shields to attenuate the stray magnetic field, [28], [29], and also with respect to control techniques to ensure a robust system performance under real operating conditions, [20], [30].…”

Multi-walled carbon nanotube-coated spiral coils for loss reduction in wireless power transfer systems

“…[8] This, however, leads to increased AC resistance in conventional copper (Cu) coils due to skin-and proximity-effect losses, thereby limiting the power transmission efficiency and effective range of WPT systems. [9][10][11][12][13] To address this limitation, several approaches have been proposed for the fabrication of inductive coils, such as using Litz-wires, [14][15][16] magnetoplated wire, [17] and planar spiral winding (PSW). However, the impact of these approaches is limited to KHz frequencies.…”