Efficient Wireless MPT(Microwave Power Transfer) System to the Multiple IoT Devices

Abstract

Plenty of IoT (internet of things) devices are working that require battery and power source to work on. Without replacing the battery, the wireless power transfer technology can provide the power to rechargeable batteries of IoT devices from the wireless power supply station. However, it is not easy to provide the power the distance IoT devices power-efficiently, because the power efficiency is greatly decreased down according to the transfer range. Also, the total power transfer, control and maintenance of the total power level of all IoT devises are really tough and difficult because there is no power level information of each IoT devices in the total power network system. So, in this paper we like to suggest an efficient MPT (microwave power transfer) system that can wirelessly transmit the power to the multiple IoT power receiver in order to finally control and manage the total power level. Basically, the power transmitter of the conventional MPT (microwave power transfer) system for the multiple receivers provides the wireless power to a receiver in the power request sequence order, which can be consider as the first-in first-service method. From the aspect of overall power management and control of wireless power transfer system, this has critically serious problem to the receivers with very low battery power level because of the too long waiting or delay time to them. This drawback can be overcome by the proposed system. Using the power receiver identification (ID) and battery power level information, the proposed system transmits the wireless power to the receiver of the lowest battery power. In this paper, to evaluate the performance of the proposed system, the total workload of the receivers is evaluated by applying each of the proposed system and the conventional system.