|Title||Watt-level wireless power transmission to multiple compact receivers|
|Publication Type||Conference Paper|
|Year of Publication||2015|
|Authors||Garraud, A., D. J. Munzer, M. Althar, N. Garraud, and D. P. Arnold|
|Conference Name||Journal 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.