DC analysis of quasi-resonant buck and forward converters including effects of parasitic elements

Simple item page
dc.contributor.authorRoufberg, Lewis Marlinen
dc.contributor.committeechairLee, Fred C.en
dc.contributor.committeememberVorperian, Vatcheen
dc.contributor.committeememberCho, Bo H.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:50:22Zen
dc.date.adate2012-11-20en
dc.date.available2014-03-14T21:50:22Zen
dc.date.issued1987-03-05en
dc.date.rdate2012-11-20en
dc.date.sdate2012-11-20en
dc.description.abstractThe need for smaller and more efficient power supplies steadily grows. Many power supplies incorporate high-frequency dc-to-dc switching converters to meet these demands. Recently, a new class of switching converters has been introduced which can operate at very high frequencies to further reduce size and increase efficiency. They are called quasi-resonant converters. Previously, the dc characteristics of many of these converters had been determined, assuming ideal components and circuit operating conditions. However, as the frequency of operation increases, the circuit behavior becomes less ideal causing changes in the expected characteristics. This is because resistive losses, semiconductor junction capacitances, and other parasitic (undesirable) elements become more pronounced at higher frequencies. This thesis investigates the effects of parasitic elements on the dc characteristics of several zero-current-switched, buck-derived quasi-resonant converters. For the quasi-resonant buck converter, it is demonstrated that for certain operating conditions the dc voltage gain can increase when parasitic losses are increased. Design guidelines are given for maximizing this converter's efficiency. Various forward quasi-resonant topologies are investigated, and the effects of parasitic elements on circuit operation are highlighted. A dc analysis is performed for the secondary-resonance forward converter, which has not previously been analyzed. This converter can operate either in full-wave or half-wave mode. Its dc voltage gain in full-wave mode is less sensitive to load variations than other resonant forward topologies that only operate in half-wave mode.en
dc.description.degreeMaster of Scienceen
dc.format.extentv, 190 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11202012-040307en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11202012-040307/en
dc.identifier.urihttp://hdl.handle.net/10919/45924en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1987.R682.pdfen
dc.relation.isformatofOCLC# 16271765en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1987.R682en
dc.subject.lcshElectric current converters -- Evaluationen
dc.subject.lcshPower resources -- Evaluationen
dc.subject.lcshPower resources -- Mathematical modelsen
dc.subject.lcshSwitching circuitsen
dc.titleDC analysis of quasi-resonant buck and forward converters including effects of parasitic elementsen
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

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1987.R682.pdf
Size:
6.92 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Masters Theses