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Development of a wireless power system

Zorbas Sotirios

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Year 2018
Type of Item Diploma Work
Bibliographic Citation Sotirios Zorbas, "Development of a wireless power system", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2018
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The applications of the wireless power transfer technology range from the sectors of the automobile industry and medicine to household appliances. In this thesis, a complete wireless power transfer system was implemented that comprises of a power transmitter, a power receiver and of a graphical application that was developed in a PC environment. The control of the main system parameters was carried out from Quasi-Square Wave (QSW) modulation for the voltage control and from a Direct Digital Synthesis (DDS) microchip for the system frequency. Also, bidirectional communication was implemented between the power transmitter - PC and wireless bidirectional communication between the power transmitter and receiver. Though this communication network, the graphical application is capable of collecting all available data of the power transmitter-receiver. Furthermore, it allows the user to control all available functions and control parameters of the power transmitter-receiver systems. The innovation of this thesis lies in the development of an algorithm that, in real time, detects the frequency of operation where the system behaves like a voltage source. The maximum achievable efficiency, of the system that was designed and implemented in the course of this thesis, was measured at 70% at a 26 mm distance between the power transmitter-receiver and at 30% at a 108 mm distance. Finally, a lead-acid battery was charged, from the system that was developed, without using any additional circuitry.

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