Three-phase high-frequency transformer isolated soft-switching DC-DC resonant converters

dc.contributor.authorAlmardy, Mohamed S. M.
dc.contributor.supervisorBhat, Ashoka Krishna Sarpangal
dc.date.accessioned2011-10-14T15:32:51Z
dc.date.available2011-10-14T15:32:51Z
dc.date.copyright2011en_US
dc.date.issued2011-10-14
dc.degree.departmentDept. of Electrical and Computer Engineeringen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractThere is an increasing demand for power converters with small size, light weight, high conversion efficiency and higher power density. Also, in many applications, there is a need for dc-to-dc converters to accept dc input voltage and provide regulated and/or isolated dc output voltage at a desired voltage level including telecommunications equipment, process control systems, and in industry applications. This thesis presents the analysis, design, simulation and experimental results of three-phase high-frequency transformer isolated resonant converters. The first converter presented is a three-phase LCC-type dc-dc resonant converter with capacitor output filter including the effect of the magnetizing inductance of the three-phase HF transformer. The equivalent ac load resistance is derived and the converter is analyzed by using approximation analysis approach. Base on this analysis, design curves have been obtained and a design example is given. Intusoft simulation results for the designed converter are given for various input voltage and for different load conditions. The experimental verification of the designed converter performance was established by building a 300 W rated power converter and the experimental results have been given. It is shown that the converter works in zero-voltage switching (ZVS) at various input voltage and different load conditions. A three-phase (LC)(L)-type dc-dc series-resonant converter with capacitive output filter has been proposed. Operation of the converter has been presented using the operating waveforms and equivalent circuit diagrams during different intervals. An approximate analysis approach is used to analyze the converter operation, and design procedure is presented with a design example. Intusoft simulation results for the designed converter are given for input voltage and load variations. Experimental results obtained in a 300 W converter are presented. Major advantages of this converter are the leakage and magnetizing inductances of the high-frequency transformer are used as part of resonant circuit and the output rectifier voltage is clamped to the output voltage. The converter operates in soft-switching for the inverter switches for the wide variations in supply voltage and load and it requires narrow switching frequency variation (compared to LCC-type) to regulate the output voltage. A three-phase high-frequency transformer isolated interleaved (LC)(L)-type dc-dc series-resonant converter with capacitive output filter using fixed frequency control is proposed. The converter operation for different modes is presented using the operating waveforms and equivalent circuit diagrams during different intervals. This converter is modeled and then analyzed using the approximate complex ac circuit analysis approach. Based on the analysis, design curves were obtained and the design procedure is presented with a design example. The designed converter is simulated using PSIM software to predict the performance of the converter for variations in supply voltage and load conditions. The converter operates in ZVS for the inverter switches with minimum input voltage and loses ZVS for two switches in each bridge for higher input voltages.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitation[1] Almardy, M. S., and Bhat, A. K. S., “Three-phase (LC)(L)-type series-resonant converter with capacitive output filter,” IEEE Trans. On Power Electronics, vol. 26, no.4, pp. 1172-1183, April 2011.en_US
dc.identifier.bibliographicCitation[2] Almardy, M. S., and Bhat, A. K. S., “Three-phase (LC)(L)-type series-resonant converter: design and experimental results,” in Proceedings of International Conference on Electronic Devices, System and Applications, IEEE ICEDSA, pp. 70-75, 2010.en_US
dc.identifier.bibliographicCitation[3] Almardy, M., and Bhat, A. K. S., “Three-phase (LC)(L)-type series-resonant converter with capacitive output filter,” IEEE 7th International conference on Power Electronics and Drive systems, pp. 468-475, 2007.en_US
dc.identifier.urihttp://hdl.handle.net/1828/3594
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectApproximate complex ac circuit analysisen_US
dc.subject(LC)(L)-typeen_US
dc.subjectLCC-typeen_US
dc.subjectInterleaved (LC)(L)-typeen_US
dc.subjectThree-phaseen_US
dc.subjectDC-DC resonant converteren_US
dc.subjectZero-voltage switchingen_US
dc.subjectvariable and fixed frequencyen_US
dc.titleThree-phase high-frequency transformer isolated soft-switching DC-DC resonant convertersen_US
dc.typeThesisen_US

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