Shevchenko V. Wireless Power Transfer System Based on Multilevel Converters with Improved Power Dencity.

The object of research is wireless power transfer system for charging low-voltage energy storage devices of low-power individual electric vehicles. The dissertation purpose is improving the mass and size parameters of the wireless power transfer system, namely the wireless charger for low-voltage batteries of individual electric vehicles by reviewing, analyzing, comparing, calculating, justification of choice and implementation practical technical and software methods and tools. The Methods of research are theory of electric circuits, finite element method, moving average method, Laplace transform, mathematical modeling, physical experiment. Theoretical and practical results and innovation for the first time a topology based on a T-type inverter with splitted transmitting coils was proposed, which allows to reduce the mass and dimensions of the transmitting part of the wireless charging system; a mathematical model of a wireless charging device based on a T-type inverter with splitted coils was developed, which allows to estimate the efficiency and size of magnetic components depending on the nominal parameters of the components; a comparative analysis of the used modern semiconductors in the proposed solution based on a T-type inverter, which demonstrates the advantages and disadvantages of their practical application and allows to choose the best solution; was proposed to configure the wireless charging control system, which takes into account the significant delay in data transfer between the receiving and transmitting parts, which improves the functionality and reliability of the device. The subject and the degree of implementation: the main provisions of the dissertation, as well as scientific and technical development (wireless charger for batteries) were tested by LLC "Piezosensor" in the modernization of technological equipment with hydraulic drives and systems as an alternative power source. The effectiveness of the implementation: improving the mass and size of the wireless charger for low-voltage energy storage devices, which will contribute to better distribution of such devices among consumers. The sphere of usage: wireless power transfer system, namely a wireless charger for low-voltage energy storage devices.