Analysis of Equivalent Circuit Model of Concrete WPT System

Abstract

At present, embedded wireless sensors are widely used in the structural monitoring system of bridges, tunnels and buildings. However, wireless sensors are easily limited by the capacity and size of batteries. Wireless Power Transfer technology based on magnetic resonance provides a great solution for the application of wireless sensors. However, compared with air, concrete material has a high relative dielectric constant and conductivity, which will reduce the efficiency of Wireless Power Transfer system. This paper focuses on the analysis of the Wireless Power Transfer technology for charging the sensor embedded in concrete, analyzes the influence of various parameters in concrete on the sensor coil, and puts forward the equivalent circuit model of Wireless Power Transfer based on these analyses. The equivalent circuit model can be useful to the analysis of embedded wireless sensors and the calculation of various losses, which has certain significance for the building result monitoring system using embedded wireless sensors.