Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2009. / Includes bibliographical references (p. 69-73).

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 172-182). Also available via the Internet.

Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains viii, 85 p. : ill. Includes abstract. Includes bibliographical references (p. 70-71).

Thesis (Ph.D.)--University of Florida, 2005. / Title from title page of source document. Document formatted into pages; contains 194 pages. Includes vita. Includes bibliographical references.

Thesis (Ph. D.)--Oregon State University, 2008. / Printout. Includes bibliographical references. Also available on the World Wide Web.

Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2006 / The electrical supply utility, ESKOM, cannot cope with the growing demand in South Africa. This results in load shedding and power outages. This capacity can be augmented, by conducting energy audits, retrofitting government buildings, designing and installing cost-effective lighting systems, and using renewable energy sources in rural areas. Households in rural areas depend on candles and paraffin lamps to supply light at night. Solar panels as renewable energy sources are very expensive in conventional lighting systems. The problem is that a cost-effective, affordable lighting system has not yet been designed. The following four projects have been completed by the author: - Software development for a lighting design in general - Efficient high bright light emitting diode (HB-LED) lighting system - Energy audit and retrofit of the Nuwe Hoop School in Worcester - Optimization of hybrid solar-diesel system Firstly, the author wrote a program that is used in lighting designs. This illumination software is utilized for educational purposes. A manual step-by-step lighting design procedure was compiled. The JAVA object-oriented programming language was used to write the code of the design software. Real life design parameters are fed to the program, to confirm proper implementation. The software package will perform illuminance calculations to display relevant Isolux diagrams for educational purposes.

D.Ing. (Electrical and Electronic Engineering) / The non-linear resonant pole (NLRP) inverter is part of the family of soft switching topologies based on resonant phenomena. The sequence of commutation that occurs between the semiconductors of a conventional voltage source inverter is modified through the mechanisms of energy exchange between added passive energy storage components. The NLRP inverter, through its psuedo resonant behaviour (resonant transition), gives rise to zero voltage and zero current turn-on of the switching devices as well as soft turn-off. The switching device voltage stresses are around 1 p.u, while the current stresses are reduced to around 1.3 p.u, by feeding back a portion of the load current. The rms current flowing through the inductor and switches is greatly reduced by driving the inductor into saturation (non-linear mode of operation). The advantages of soft switching, such as high switching frequency which allows greater dynamic response and higher power densities, along with reduced EMI, are achieved with this topology. Detailed analysis at multi- and sub-cycle levels is carried out, resulting in circuit equations and the criteria for commutation success. The commutation boundaries of the inverter are defined and methods discussed on how to extend them. The modulation of the NLRP inverter and some aspects regarding its use as part of both low and high performance induction motor drives are presented.

M.Ing. / Switch-mode power supplies are currently constructed by interconnecting various discrete components. There are certain drawbacks with the discrete interconnection method and as is the case with consumer electronics functional blocks of the converter must be constructed as a whole before improvements at various levels may be expected. The focus of this thesis is the functional integration of high power output filters for switchmode power supplies. Various capacitor technologies are discussed and investigated for applicability in integrated filters. The overall response of the prototype filters which has constructed are compared to that of equivalent conventional discrete filters. a General Modelling scheme is presented which is applicable to a wide range of structures and independent of excitation to facilitate improved design and prediction of the behaviour of the structures.

M.Ing. / The aim of this study was to investigate integrated power electronics, and more specifically, the design and manufacture of integrated power electronic components. After evaluating and optimising the flame spray process as a manufacturing technology for integrated power electronics, it was decided to integrate the partial series resonant converter (PSRC) as a case study. Both an integrated and discrete PSRC was built after a thorough investigation of the design of parasitic inductances as resonant components. Finally, the integrated PSRC was evaluated by comparing it to the conventionally manufactured discrete PSRC. The evaluation results showed that the integrated PSRC compared favourably with the discrete PSRC, and also takes up a smaller packaging volume, mainly because of the planar shape of the integrated magnetic cores and windings. However, if efficiency is used as a measuring rod, it is clear that the technology of integrated power electronics cannot yet compete against the conventional technology of discrete power electronics, mainly because of materials as well as manufacturing problems. As soon as the manufacturing technologies and materials used for integrated power electronics become competitive with respect to conventional manufacturing technologies and materials used for discrete power electronics, integrated power electronics will become economically viable.

D.Ing. (Electrical and Electronic Engineering) / increased dramatically during the past few years. This progress can mainly be attributed to recent developments in power electronic switching devices. Switching times are reduced, resulting in lower switching power loss, on-state voltage is reduced leading to lower conduction power losses, and higher voltage and current capabilities are possible. These advances are mainly responsible for a reduction in physical size of the converters, especially of the reactive components; an increase in dynamic response; and also, to a lesser extent, have an influence on the converter behaviour. Different applications of DC-DC converters require different characteristic behaviour, and the trend to obtain these different characteristics is usually accomplished by adding additional components to existing DC-DC converters. The disadvantage of such an approach is that it adds to the complexity of the converter topology and controller, and consequently increases the manufacturing cost, and reduces reliability. In this thesis, the objective is to identify a galvanic isolated DC-DC converter having inherent short circuit protection, sinusoidal transformer current, a low number of components and a simple controller. Hard switched DC-DC converters are approached from a fundamental point of view, weighing simplicity against characteristics, and a systematical classification is addressed. In order to address the issue of sinusoidal transformer current and inherent short circuit protection, a systematic classification of simple resonant converters is also addressed. The partial series resonant converter, which is a new converter topology, is identified and analysed. It does not follow the trend of increased converter and controller complexity with different characteristics, and meets all the objectives mentioned above. In addition to these objectives, it has the following characteristics: Output current can be controlled without any current measurement, while obtaining inherent short circuit protection. Switching losses are ultra low due to zero voltage switching at reduced turn-off current, enabling the use of insulated gate bipolar transistors at switching frequencies in excess of 50 kHz, which, among others, benefits dynamic response. The output load line resembles a natural constant output power load line at constant switchingfrequency. The combination of these characteristics is shown to provide major advances in low inductance load applications, such as arc welding and battery charging. Furthermore, all the magnetic components are integrated into one physical structure, which benefits, among others, manufacturability and cooling. The analysis and feasibility of the partial series resonant converter is verified by the construction of multi kilowatt prototypes for both battery charging and arc welding.