Design of Distributed Wireless Power Transmission System

Abstract

Wireless power transmission technology offers a wide range of industrial and biomedical applications and could lead to clean sources of electricity for a variety of users. In this technique, conventional power sources are replaced with power transmission devices, such as coils, and electric power storage devices, such as capacitors. Electronic devices, equipped with wireless power transmission systems, can operate for longer periods without the malfunctions caused by their low battery capacity. One of the main objectives in wireless power transfer is to obtain high efficiency in the system. Several parameters can affect the efficiency, such as the coil’s structure, distance between coils, load on the receiver side, number of simultaneous loads connected to one transmitter, and electric properties of WPT environment. Some of these parameters can be determined initially and properly be treated; other parameters such as load, distance between coils and environment change are more chaotic and require real-time and in situ treatment. The main purpose of this dissertation is to address the power efficiency enhancement techniques, such as real-time matching configuration and methods to increase the efficiency of the transmitted power. This thesis presents a novel-matching approach and dynamic impedance matching using capacitor matrix for real-time impedance matching. Additionally, a unique approach is presented for transmitting the RF power through an arbitrary medium and using open ended coils to locally perform the power distribution to the load nodes. A comprehensive study on the WPT subsystems has presented in FEM and circuit model simulations.