Ben-gurion University of the Negev Faculty of Engineering Sciences Department of Electrical Engineering Advanced Power Conversion Systems
نویسنده
چکیده
Abstract Nowadays system efficiency plays one of the most important roles in the power supply industry. Many research laboratories around the globe are working in an effort to achieve power processing efficiencies as close to 100% as possible. There is a long list of research directions in the chase of this goal, including smarter control methods, advanced converter topologies, employment of modern electronic elements, etc. This work concentrates on switch mode power supply systems, trying to push them one step further to comply with modern requirements. This thesis is based on 4 IEEE published articles [1], [2], [3], [4], which were coauthored by me. Each article summarizes an important part of research, examination and experimental trials on 3 switch mode power supply converters, together covering a considerable part of the modern industrial field of switched mode power supplies. Since the research work deals with 3 converters, this thesis is also divided into 3 parts, each presenting the findings that relate to the investigated converter as summarized below. Investigation of an alternative APFC control strategy with no sensing of line voltage based on a triangular modulation carrier. An alternative control method for a Boost Active Power Factor Corrector (APFC) operating in Continuous Conduction Mode is presented, analyzed and verified by simulation and experiments. The proposed APFC scheme employs average current control to shape the input current. The power level is adjusted by modulating the amplitude of a triangular carrier as a function of the outer loop error signal. The proposed APFC requires neither line voltage sensing nor input voltage reference circuitry. The theoretical predictions are well supported by simulation and experimental results. The experimental results demonstrate some improved performance at low power levels compared to other methods of APFC without sensing of input voltage. Gyrator-behaved double bridge based APFC Applying DSP capabilities, we explored in this study the characteristics and advantages of a double-bridge, Gyrator-behaved switch-mode DC-DC converter. A
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