Author Description

This dissertation, "Monitoring System Parameters and Loads in Wireless Power Transfer Systems Without Radio-frequency Communication System" by Jian, Yin,, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Wireless power transfer technology has become a preferable solution for supplying contactless energy over a certain air-gap to various applications, ranging from microwatt biomedical implantable devices to kilowatt battery charging systems for electric vehicles, due to its exclusive features of safety, flexibility and convenience. In such applications several sensors mounted on both the input and output sides are typically necessary to monitor the load variations or other system parameter changes. The communication system of radio-frequency is installed to link the two separate circuits between the power supplying and sinking terminals as the feedback loop for the control purpose. The concept of getting rid of such the complicated installations to monitor systems parameters and loads only based on the input side measurements is presented in this thesis. An offline method to identify the system parameters based on the input voltage and current measurements as well as the use of a Genetic Algorithm is proposed. It is effective in finding all the unknown parameters even in large wireless power transfer systems which consist of multiple resonant coils. This method has been successfully illustrated in a three-coil experiment with good agreements between calculated and measured parameter values. If the system parameters are known, a method is presented to show that, based only on the measurements of the