tud Piezoelectric Transformer Integration Possibility in High Power Density Applications 2008-07-02 [Electronic ed.] 4519974-7 Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden prv Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, Dresden Elektrotechnik und Informationstechnik Phu tho / Viet nam The contents of this work investigate the capability of integrating the PT in applications by invoking the ratio of the throughput power to volume represented by the term: power density. The fundamentals of the PT are introduced in chapter two. In chapter three, the fundamental limitations of the PT's capability of transferring power to the load are studied. There are three major limitations: temperature rise due to losses during operation, electromechanical limits of material, and interactions with output rectifier. The analysis and estimation are then verified by experiments and calculations implemented on three different PT samples fabricated from three different manufacturers. The subject of chapter four is the behavior of the PT's power amplifier. This chapter concentrates on two main amplifier topologies, optimized based on the simplicity of structure and minimization of components (passive and active): class D and class E amplifiers. The operational characteristics of these amplifiers with the PT are then comparison. Methods to track the optimum frequency and discontinuous working mode of the PT are proposed as the approaches to improve the energy transfer of the PT. In chapter five, prototypes of four devices using a PT are developed and introduced as illustrations of the integration of PTs into practical applications: an igniter for high intensity discharge (HID) lamps, high DC voltage power supplies, and electronic ballasts for LEDs, and stand-alone ionizers for food sterilizers. Some concluding statements and ideas for future works are located in the last chapter - chapter six. 620 ZN 4428 piezoelectrische Transformatoren, Leistungsdichte, diskontinuierlichen Betriebsmodus Piezoelectric transformer, power density, discontinuous operation mode urn:nbn:de:bsz:14-ds-1214984646187-55994 283934387 Technische Universität Dresden pbl Technische Universität Dresden, Dresden Manh Cuong Do 1977-01-22 aut Henry Güldner Prof. Dr.-Ing. habil. dgs rev Ng. Ph. Quang Prof. Dr.-Ing. habil. rev K. Hoffmann Prof. Dr.-Ing. rev eng 2007-12-20 2008-06-02 born digital doctoral_thesis