Novel zero-voltage switching techniques for pulse-width-modulated converters

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dc.contributor.authorHua, Guichaoen
dc.contributor.committeechairLee, Fred C.en
dc.contributor.committeememberChen, Dan Y.en
dc.contributor.committeememberJovanovic, Milan M.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:32:09Zen
dc.date.adate2009-03-24en
dc.date.available2014-03-14T21:32:09Zen
dc.date.issued1991-05-28en
dc.date.rdate2009-03-24en
dc.date.sdate2009-03-24en
dc.description.abstractTwo new classes of soft switching pulse-width-modulated (PWM) converters, named zero-voltage-switched (ZVS) PWM converters and zero-voltage-transition (ZVT) PWM converters, are proposed. The proposed ZVS-PWM converters combine the merits of conventional PWM and ZVS-QRC techniques. They are capable of regulating the output for a wide load and input voltage range while maintaining constant-frequency operation. By employing a saturable inductor, the load range under which ZVS is maintained can be significantly extended without increasing the voltage stress of the power switch. The parasitic oscillations between the diode junction capacitance and the resonant inductor are also significantly reduced. In the new class of ZVT-PWM converters, both the power switch and the rectifier diode are operated with zero-voltage switching, and are subjected to low voltage and current stresses associated with those in their PWM counterparts. Thus switching losses are significantly reduced at a slight increase in conduction losses. In addition, the circuit optimization is simplified because of constant-frequency operation. The operation principles of the proposed converters are described by using several examples. Several breadboarded converters are implemented to verify the theoretical analysis and to demonstrate the feasibility of the proposed technologies.en
dc.description.degreeMaster of Scienceen
dc.format.extentiv, 79 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03242009-040340en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03242009-040340/en
dc.identifier.urihttp://hdl.handle.net/10919/41743en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.H82.pdfen
dc.relation.isformatofOCLC# 24339343en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.H82en
dc.subject.lcshElectric current converters -- Researchen
dc.subject.lcshSwitched capacitor circuits -- Researchen
dc.titleNovel zero-voltage switching techniques for pulse-width-modulated convertersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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