Thesis (Ph. D.)--University of Wisconsin--Madison, 1980. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 405-414).

M.Ing. (Electrical and Electronic Engineering) / In an attempt to build a 2000A transistor switch. with the possibility of integrating the electromagnetic components, different transistor switch and transformer configurations were investigated and compared. A standard high frequency monolithic transformer was investigated for the integration with the rest of the circuit. Different problems were found as will be discussed. A saturation of the transformer to one side occurred, and a control circuit for this was developed and is discussed. A different approach to transformers, matrix transformers, was investigated for the application in high current, low voltage supplies, such as a compensating supply for a compensated Darlington transistor. From the matrix transformers a new kind of transformer connection style, namely a symmetric transformer, followed. The symmetrical transformer was investigated for the possible use in monolitic transformers, and compared with halfbridge, fullbridge and push-pull transformer configurations. It was decided to proceed further with matrix transformers. A design of a 400A 1.5Vsupply, was done to serve as a compensating supply in a 2000A compensated Darlington transistor switch. The supply was built up and analysed. Different switch configurations were investigated for use as possible transistor switches. The compensated Darlington was considered to be the best. Unexpected switch off problems occurred. These are discussed and an optimum switch off topology is suggested. A 2000A transistor switch was designed and built. Full current could not be reached and results are presented up to 650A.

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"28th September 2001" / Bibliography: p. 285-310. / xlvi, 350 p. : ill. (some col.), plates (col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis describes by theory and experiment, the effectiveness of an alternate error sensing strategy suitable for the control of general free field sound radiation problems, namely active intensity. In this research, active intensity error sensing has been rigorously analysed: 1. in the near and far field of the disturbance source; 2. to determine its ability to lead to global control via sound power attenuation; 3. in a real control system. The performance of active intensity error sensors were evaluated both analytically and experimentally in progressively more complex environments to identify their capabilities and limitations. / Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 2001

The Balun Core is used in this paper to design a balance to unbalance 1:1 wideband transmission line transformer, because magnetism this package of Balun core witch cover good, leak magnetism inductance to be relatively little, can give consideration to characteristic, low frequency of section, and because the volume is small can make transmission line short, also can give consideration to necessary high frequency too. And wide bandwidth transmission line transformers (TLTs), in many kinds of RF circuit, offer wide frequency band impedance transform, usually in equipment and characteristic impedance of system match. If load or the secondary circuit and impedance mismatch of the signal source or the equipment end, unable to reach the best power of transmission, most power loss because of impedance mismatch, and inserting loss increasing too. With higher frequency and wide bandwidth of utilization component at present, so wideband impedance match is importance.

Thesis (Ph. D.)--University of Queensland, 2003. / Includes bibliographical references.

M. Tech. Electrical Engineering. / Discusses the appearance of partial discharge (PDs) is a problem of insulation failure in high voltage equipment used in power plants. As the insulation of equipment has a sensitive zone, therefore the quality of insulation plays an important role in such power equipment. PDs in power transformers are capable of leading to corrosion on solid insulating materials, thereby in the long term, causing a breakdown of the particular operating component. It follows that the real challenge is to identify the most appropriate method for the measurement and/or detection of PDs.

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