Directional mobile charging method for mine Internet of things

Abstract

The nodes of the mine Internet of things (MIoT) are powered by batteries, for which the wireless charging is essential for their continuous and stable operation. This study proposed a method of directional mobile charging for the MIoT based on smart antenna, in which the mobile chargers charge the nodes need power not only when stationary, but also when moving. The theoretical calculation method of the charged energy is studied and established its approximate calculation algorithm, which can greatly reduce the computational complexity, based on the discretised model of effective charging distance of smart antenna. Then, the method for estimating the residual energy of the nodes was designed, and the upper bound of the transmitting power of the mobile charger was determined. The results of the simulation experiments indicated that this method has high charging efficiency and can meet the power demand of MIoT nodes.