Watt-level wireless power transmission to multiple compact receivers

TitleWatt-level wireless power transmission to multiple compact receivers
Publication TypeConference Paper
Year of Publication2015
AuthorsGarraud, A., D. J. Munzer, M. Althar, N. Garraud, and D. P. Arnold
Conference NameJournal of Physics: Conference Series

This paper reports an electrodynamic wireless power transmission (EWPT) system using a low-frequency (300 Hz) magnetic field to transmit watt-scale power levels to multiple compact receivers. As compared to inductively or resonantly coupled coils, EWPT facilitates transmission to multiple non-interacting receivers with little restriction on their orientation. A single 3.0 cm 3 receiver achieves 1.25 W power transmission with 8% efficiency at a distance of 1 cm (350 mW/cm 3 power density) from the transmitter. The same prototype achieves 9 mW at a distance of 9 cm. Moreover, we demonstrate simultaneous recharge of two wearable devices, using two receivers located in arbitrary positions and orientations.