Experiment and Analysis of Relationship Between Transmission Distance and Multiple-Transmitter WPT System

As the Internet of Things technology has developed, the demand for wireless power transmission has increased, and research on wireless power transfer (WPT) has been actively conducted over the past decade. However, the transmission distance still should be increased more than the current technology for practical use. Among various methods to improve the transmission distance, multiple coil structures have recently been in the spotlight. In this paper, the transmitter array condition to effectively increase the transmission distance is analyzed and derived mathematically. To validate our analysis, a multiple transmitters WPT system was experimentally implemented and the performance of the prototype was measured. In addition, a good agreement was obtained by comparing the derived formula with the experiment.