  Resonant beam charging (RBC) can realize wireless power transfer (WPT) from a
transmitter to multiple receivers via resonant beams. The adaptive RBC (ARBC)
can effectively improve its energy utilization. In order to support multi-user
WPT in the ARBC system, we propose the time-division multiple access (TDMA)
method and design the TDMA-based WPT scheduling algorithm. Our TDMA WPT method
has the features of concurrently charging, continuous charging current,
individual user power control, constant driving power and flexible driving
power control. The simulation shows that the TDMA scheduling algorithm has high
efficiency, as the total charging time is roughly half (46.9% when charging 50
receivers) of that of the alternative scheduling algorithm. Furthermore, the
TDMA for WPT inspires the ideas of enhancing the ARBC system, such as flow
control and quality of service (QoS).
